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From: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
To: "Xen-users (Xen-users@lists.xenproject.org)"
	<Xen-users@lists.xenproject.org>
CC: Stefano Stabellini <sstabellini@kernel.org>
Subject: Ethernet on Arm true dom0-less
Thread-Topic: Ethernet on Arm true dom0-less
Thread-Index: AdcOcegYZUMjEDlXShiDrT3Q7AcOPw==
Date: Mon, 1 Mar 2021 08:10:20 +0000
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Hi all,

I have true dom0-less up and running on Xilinx ZynqMP UltraScale+ (Arm A5=
3), based on Xen-4.11 - the official version of SDK 2019.1.

>From what I see, PV is not supported in this configuration. Without writi=
ng proprietary drivers, would Ethernet sharing between Doms be supported =
- for example via VNIC?

Thank you,
Dov
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From: Bertrand Marquis <Bertrand.Marquis@arm.com>
To: Deepthi M. <Deepthi.M@Ltts.com>
CC: Pelluru VamsiKrishna <Pelluru.VamsiKrishna@Ltts.com>, xen-users
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Subject: Re: domU failing when flashing with Android images
Thread-Topic: domU failing when flashing with Android images
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Date: Mon, 1 Mar 2021 11:20:15 +0000
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Hi Deepthi,

Please always send those kind of mails to xen-users so that others could be=
nefit of the answers or could give you answers.

> On 26 Feb 2021, at 06:52, Deepthi M. <Deepthi.M@Ltts.com> wrote:
>=20
>=20
> Hi Bertrand,
>=20
> We are able to boot xen hypervisor dom0 with linux  and domU with linux o=
n RcarH3-Salvator.
>=20
> Now we are trying to port android as domU with the attached configuration=
 file, when we are creating domU.cfg  with xl create list we are getting th=
e error listed in domuconf_failed_log.

The log I received is truncated but it seems that you disk for the guest co=
uld not be setup.

>=20
> Instructions are flashing android to emmc but we copied system.img, ramdi=
sk.img and userdata.img to /home/root/android in sdcard.

Could you resend the failing logs directly in the mail (and not as attached=
 file) ?

Cheers
Bertrand

>=20
> Please provide your guidance to resolve the issue.
>=20
> Thank you,
> Deepthi
>=20
>=20
>=20
>=20
>=20
> L&T Technology Services Ltd
> www.LTTS.com
> L&T Technology Services Limited (LTTS) is committed to safeguard your dat=
a privacy. For more information to view our commitment towards data privacy=
 under GDPR, please visit the privacy policy on our website www.Ltts.com. T=
his Email may contain confidential or privileged information for the intend=
ed recipient (s). If you are not the intended recipient, please do not use =
or disseminate the information, notify the sender and delete it from your s=
ystem.
> <domuconf_failed_log><domU.cfg>



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From: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
To: Bertrand Marquis <Bertrand.Marquis@arm.com>, Stefano Stabellini
	<sstabellini@kernel.org>
CC: Julien Grall <julien@xen.org>, "Xen-users@lists.xenproject.org"
	<Xen-users@lists.xenproject.org>, Wei Chen <Wei.Chen@arm.com>, Penny Zheng
	<Penny.Zheng@arm.com>, Luca Fancellu <Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
Thread-Topic: Aligning Xen to physical memory maps on embedded systems
Thread-Index: AdcIbsi89MadXehWTs+A1h4hE7ONNwAhYRqAAApfvWAAFgEugAAQvBaAATnqRTA=
Date: Mon, 1 Mar 2021 13:46:36 +0000
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>=20
> (+ Penny, Wei and Luca)
>=20
> > On 23 Feb 2021, at 01:52, Stefano Stabellini <sstabellini@kernel.org>=
=20wrote:
> >
> > On Mon, 22 Feb 2021, Levenglick Dov wrote:
> >>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of which Xen
> >>>> and the DomU have an allocation of 1.25GB, per this memory map:
> >>>> 1. DomU1: 0x60000000 - 0x80000000
> >>>> 2. DomU2: 0x40000000 - 0x60000000
> >>>> 3. Xen: 0x30000000 - 0x40000000
> >>>
> >>> How did you tell Xen which regions is assigned to which guests? Are=

> >>> your domain mapped 1:1 (i.e guest physical address =3D=3D host phys=
ical
> address)?
> >>
> >> I am working on a solution where if the "xen,domain" memory has
> >> #size-cell cells the content is backward compatible. But if it
> >> contains (#address-cells + #size-cells), the address cells should be=

> considered the physical start address.
> >> During the mapping of the entire address space insetup_mm(), the
> >> carved out addresses would be added to the  reserved memory address
> >> space. When the DomU is to be created, this physical space would be
> >> mapped to it. The virtual addresses are less of an issue and needn't=
=20be
> mapped 1x1 (although they could be).
> >
> > As of today neither upstream Xen nor the Xilinx Xen tree come with th=
e
> > feature of allowing the specification of an address range for dom0les=
s
> > guests.
> >
> > The only thing that Xilinx Xen allows, which is not upstream yet, is
> > the ability of creating dom0less guests 1:1 mapped using the "direct-=
map"
> > property. But the memory allocation is still done by Xen (you can't
> > select the addresses).
> >
> > Some time ago I worked on a hacky prototype to allow the specificatio=
n
> > of address ranges, see:
> >
> > http://xenbits.xenproject.org/git-http/people/sstabellini/xen-unstabl=
e
> > .git direct-map-2 from 7372466b21c3b6c96bb7a52754e432bac883a1e3
> onward.
> >
> > In particular, have a look at "xen/arm: introduce 1:1 mapping for
> > domUs". The work is not complete: it might not work depending on the
> > memory ranges you select for your domUs. In particular, you can't
> > select top-of-RAM addresses for your domUs. However, it might help yo=
u
> > getting started.
> >
> >
> >>>> I am able to support True Dom0-less by means of the patch/hack
> >>>> demonstrated By Stefano Stabellini at
> >>> https://youtu.be/UfiP9eAV0WA?t=3D1746.
> >>>>
> >>>> I was able to forcefully put the Xen binary at the address range
> >>>> immediately below 0x40000000 by means of modifying
> get_xen_paddr()
> >>>> -
> >>> in itself an ugly hack.
> >>>>
> >>>> My questions are:
> >>>> 1. Since Xen performs runtime allocations from its heap, it is all=
ocating
> >>>>    downwards from 0x80000000 - thereby "stealing" memory from
> DomU1.
> >>>
> >>> In theory, any memory reserved for domains should have been carved
> >>> out from the heap allocator. This would be sufficient to prevent Xe=
n
> >>> allocating memory from the ranges you described above.
> >>>
> >>> Therefore, to me this looks like a bug in the tree you are using.
> >>
> >> This would be a better approach, but because Xen perform allocations=

> >> from its heap prior to allocating memory to DomU - and since it
> >> allocates from the top of the heap - it is basically taking memory t=
hat I
> wanted to set aside for the DomU.
> >
> > Yeah, this is the main problem that my prototype above couldn't solve=
.

Stephano: Is the approach that I previously described a feasible one?
=20 1. Mark the addresses that I want to set aside as reserved
=20 2. When reaching the proper DomU, map them and then use the mapping
This approach would solve the heap issue
> >
>=20
> Wei and Penny are working on direct map and static allocation to fit
> embedded use cases an might have more answer there.

Bertrand, Wei and Penny: Is there a "sneak preview"? I'd be happy to star=
t backporting to Xen 4.11

>=20
> On the fix from Stefano explained in the video, Luca Fancellu made a pa=
tch to
> propose a long term solution and will push it upstream next week.

Bertrand: Do You know which commit ID this is? Since I'm working on a Xil=
inx fork, I am out of touch with the goings of the main tree.


Thanks,
Dov
The information in this e-mail transmission contains proprietary and busi=
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sensitive information.  Unauthorized interception of this e-mail may cons=
titute=20
a violation of law. If you are not the intended recipient, you are hereby=
=20
notified that any review, dissemination, distribution or duplication of t=
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communication is strictly prohibited. You are also asked to contact the s=
ender=20
by reply email and immediately destroy all copies of the original message=
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Date: Mon, 1 Mar 2021 09:06:24 +0100
From: Henrik Riomar <rio@riomar.se>
To: xen-users@lists.xenproject.org
Subject: pci passthrough and msi-x
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Hi,

What options are needed to get MSI-X interrupts working with pci passthrough?

Running Linux 5.10 in dom0 and in the guest with XEN 4.14.1.

Passing trough two Intel X553 NICs to the guest with this in xl.conf:
pci         = [ '08:00.0','08:00.1' ]

But what else is needed for MSI-X?

Also what about the swiotlb warning? whats needed to suppress fix that?

Thanks,
 Henrik

dmesg in domU:
[    1.509720] Mounting root: ok.
[    2.614502] cryptd: max_cpu_qlen set to 1000
[    2.619136] SSE version of gcm_enc/dec engaged.
[    2.632522] EDAC pnd2: Failed to register device with error -19.
[    2.667770] input: PC Speaker as /devices/platform/pcspkr/input/input0
[    2.702441] pcifront pci-0: Installing PCI frontend
[    2.703239] xen:swiotlb_xen: Warning: only able to allocate 4 MB for software IO TLB
[    2.767077] software IO TLB: mapped [mem 0x0000000005800000-0x0000000005c00000] (4MB)
[    2.767384] pcifront pci-0: Creating PCI Frontend Bus 0000:00
[    2.767453] pcifront pci-0: PCI host bridge to bus 0000:00
[    2.767457] pci_bus 0000:00: root bus resource [io  0x0000-0xffff]
[    2.767459] pci_bus 0000:00: root bus resource [mem 0x00000000-0x7fffffffff]
[    2.767461] pci_bus 0000:00: root bus resource [bus 00-ff]
[    2.767869] pci 0000:00:00.0: [8086:15e4] type 00 class 0x020000
[    2.768544] pci 0000:00:00.0: reg 0x10: [mem 0xdd600000-0xdd7fffff 64bit pref]
[    2.769524] pci 0000:00:00.0: reg 0x20: [mem 0xdd804000-0xdd807fff 64bit pref]
[    2.769857] pci 0000:00:00.0: reg 0x30: [mem 0xdf180000-0xdf1fffff pref]
[    2.771631] pci 0000:00:00.0: [Firmware Bug]: reg 0x184: invalid BAR (can't size)
[    2.772607] pci 0000:00:00.0: [Firmware Bug]: reg 0x190: invalid BAR (can't size)
[    2.780194] pci 0000:00:00.1: [8086:15e4] type 00 class 0x020000
[    2.780845] pci 0000:00:00.1: reg 0x10: [mem 0xdd400000-0xdd5fffff 64bit pref]
[    2.781816] pci 0000:00:00.1: reg 0x20: [mem 0xdd800000-0xdd803fff 64bit pref]
[    2.782139] pci 0000:00:00.1: reg 0x30: [mem 0xdf100000-0xdf17ffff pref]
[    2.783949] pci 0000:00:00.1: [Firmware Bug]: reg 0x184: invalid BAR (can't size)
[    2.784917] pci 0000:00:00.1: [Firmware Bug]: reg 0x190: invalid BAR (can't size)
[    2.795870] pcifront pci-0: claiming resource 0000:00:00.0/0
[    2.795875] pcifront pci-0: claiming resource 0000:00:00.0/4
[    2.795876] pcifront pci-0: claiming resource 0000:00:00.0/6
[    2.795878] pcifront pci-0: claiming resource 0000:00:00.1/0
[    2.795879] pcifront pci-0: claiming resource 0000:00:00.1/4
[    2.795883] pcifront pci-0: claiming resource 0000:00:00.1/6
[    2.799838] dca service started, version 1.12.1
[    2.841452] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[    2.841455] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[    2.853935] ixgbe 0000:00:00.0: Xen PCI mapped GSI17 to IRQ19
[    3.097931] EDAC pnd2: Failed to register device with error -19.
[    3.193603] Interrupt reservation exceeds available resources
[    3.193683] ixgbe 0000:00:00.0: Failed to allocate MSI-X interrupts. Err: -28
[    3.193686] ixgbe 0000:00:00.0: Disabling SR-IOV support
[    3.193688] ixgbe 0000:00:00.0: Disabling RSS support
[    3.193901] Interrupt reservation exceeds available resources
[    3.193912] ixgbe 0000:00:00.0: Failed to allocate MSI interrupt, falling back to legacy. Error: -28
[    3.193918] ixgbe 0000:00:00.0: Multiqueue Disabled: Rx Queue count = 1, Tx Queue count = 1 XDP Queue count = 0
[    3.321556] ixgbe 0000:00:00.0: MAC: 6, PHY: 27, PBA No: 030000-000
[    3.321560] ixgbe 0000:00:00.0: 3c:ec:ef:03:0b:d6
[    3.369729] ixgbe 0000:00:00.0: Intel(R) 10 Gigabit Network Connection
[    3.373883] ixgbe 0000:00:00.1: Xen PCI mapped GSI18 to IRQ20
[    3.903506] Interrupt reservation exceeds available resources
[    3.903566] ixgbe 0000:00:00.1: Failed to allocate MSI-X interrupts. Err: -28
[    3.903569] ixgbe 0000:00:00.1: Disabling SR-IOV support
[    3.903570] ixgbe 0000:00:00.1: Disabling RSS support
[    3.903800] Interrupt reservation exceeds available resources
[    3.903811] ixgbe 0000:00:00.1: Failed to allocate MSI interrupt, falling back to legacy. Error: -28
[    3.903825] ixgbe 0000:00:00.1: Multiqueue Disabled: Rx Queue count = 1, Tx Queue count = 1 XDP Queue count = 0
[    4.036582] ixgbe 0000:00:00.1: MAC: 6, PHY: 27, PBA No: 030000-000
[    4.036587] ixgbe 0000:00:00.1: 3c:ec:ef:03:0b:d7
[    4.080368] ixgbe 0000:00:00.1: Intel(R) 10 Gigabit Network Connection


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Date: Mon, 1 Mar 2021 14:47:54 +0000
To: xen-announce@lists.xenproject.org
CC: xen-devel@lists.xenproject.org,
    xen-users@lists.xenproject.org
Subject: Xen 4.15 RC1
X-Mailer: VM 8.2.0b under 24.5.1 (i686-pc-linux-gnu)

Xen 4.15 RC1 is now available.

It is available from git:
  git clone https://xenbits.xenproject.org/git-http/xen.git -b 4.15.0-rc1

For your convenience a tarball is available:
  https://downloads.xenproject.org/release/xen/4.15.0-rc1/xen-4.15.0-rc1.tar.gz
  https://downloads.xenproject.org/release/xen/4.15.0-rc1/xen-4.15.0-rc1.tar.gz.sig

Please send bug reports and test reports to
xen-devel@lists.xenproject.org.  When sending bug reports, please CC
relevant maintainers and me (iwj@xenproject.org).

We will have Xen Test Days from RC2 onwards.

Ian.


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Date: Mon, 1 Mar 2021 17:51:21 -0800 (PST)
From: Stefano Stabellini <sstabellini@kernel.org>
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To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
cc: "Xen-users (Xen-users@lists.xenproject.org)" <Xen-users@lists.xenproject.org>, 
    Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: Ethernet on Arm true dom0-less
In-Reply-To: <c904dd8b12904b4db33af56f192f2a76@elbitsystems.com>
Message-ID: <alpine.DEB.2.21.2103011743330.2682@sstabellini-ThinkPad-T480s>
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On Mon, 1 Mar 2021, Levenglick Dov wrote:
> Hi all,
> 
> I have true dom0-less up and running on Xilinx ZynqMP UltraScale+ (Arm A53), based on Xen-4.11 - the official version of SDK 2019.1.
> 
> >From what I see, PV is not supported in this configuration. Without writing proprietary drivers, would Ethernet sharing between Doms be supported - for example via VNIC?

Hi Dov,

Yes, PV is not supported yet, but there are a couple of workarounds you
can use today.

One workaround is to setup a couple of AXI Ethernet Lite interfaces in
PL connected via a level2 switch (also in PL). Then you can assign each
ethernet interface to a different VM.

Another workaround is to statically share some memory between the two
VMs. Then you can setup your own ring for communication on top.


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From: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
To: Stefano Stabellini <sstabellini@kernel.org>
CC: "Xen-users (Xen-users@lists.xenproject.org)"
	<Xen-users@lists.xenproject.org>
Subject: RE: Ethernet on Arm true dom0-less
Thread-Topic: Ethernet on Arm true dom0-less
Thread-Index: AdcOcegYZUMjEDlXShiDrT3Q7AcOPwAg9+OAAAzkz/A=
Date: Tue, 2 Mar 2021 06:01:08 +0000
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References: <c904dd8b12904b4db33af56f192f2a76@elbitsystems.com>
 <alpine.DEB.2.21.2103011743330.2682@sstabellini-ThinkPad-T480s>
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Thank you. I'll look into the option in the PL. If not - shared memory it=
=20is



> -----Original Message-----
> From: Stefano Stabellini <sstabellini@kernel.org>
> Sent: Tuesday, March 2, 2021 3:51 AM
> To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
> Cc: Xen-users (Xen-users@lists.xenproject.org) <Xen-
> users@lists.xenproject.org>; Stefano Stabellini <sstabellini@kernel.org=
>
> Subject: Re: Ethernet on Arm true dom0-less
>=20
> On Mon, 1 Mar 2021, Levenglick Dov wrote:
> > Hi all,
> >
> > I have true dom0-less up and running on Xilinx ZynqMP UltraScale+ (Ar=
m
> A53), based on Xen-4.11 - the official version of SDK 2019.1.
> >
> > >From what I see, PV is not supported in this configuration. Without =
writing
> proprietary drivers, would Ethernet sharing between Doms be supported -=

> for example via VNIC?
>=20
> Hi Dov,
>=20
> Yes, PV is not supported yet, but there are a couple of workarounds you=
=20can
> use today.
>=20
> One workaround is to setup a couple of AXI Ethernet Lite interfaces in =
PL
> connected via a level2 switch (also in PL). Then you can assign each et=
hernet
> interface to a different VM.
>=20
> Another workaround is to statically share some memory between the two
> VMs. Then you can setup your own ring for communication on top.
The information in this e-mail transmission contains proprietary and busi=
ness=20
sensitive information.  Unauthorized interception of this e-mail may cons=
titute=20
a violation of law. If you are not the intended recipient, you are hereby=
=20
notified that any review, dissemination, distribution or duplication of t=
his=20
communication is strictly prohibited. You are also asked to contact the s=
ender=20
by reply email and immediately destroy all copies of the original message=
.


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From: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
To: Stefano Stabellini <stefano.stabellini@xilinx.com>
CC: Bertrand Marquis <Bertrand.Marquis@arm.com>, Stefano Stabellini
	<sstabellini@kernel.org>, Julien Grall <julien@xen.org>,
	"Xen-users@lists.xenproject.org" <Xen-users@lists.xenproject.org>, Wei Chen
	<Wei.Chen@arm.com>, Penny Zheng <Penny.Zheng@arm.com>, Luca Fancellu
	<Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
Thread-Topic: Aligning Xen to physical memory maps on embedded systems
Thread-Index: AdcIbsi89MadXehWTs+A1h4hE7ONNwAhYRqAAApfvWAAFgEugAAQvBaAATnqRTAAFQRaAAANQqMA
Date: Tue, 2 Mar 2021 06:08:47 +0000
Message-ID: <ec043ced97074743bd06bb8362c4f38f@elbitsystems.com>
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Thank you.
A few final comments below + one last question regarding the Xilinx forks=
:
Xen 4.13 is first available on the 2020.1 branch. Is it required that the=
=202020.1 branch of linux-xlnx be used as well, or can I keep the 2019.1 =
branch that I am currently using?


> -----Original Message-----
> From: Stefano Stabellini <stefano.stabellini@xilinx.com>
> Sent: Tuesday, March 2, 2021 3:42 AM
> To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
> Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>; Stefano Stabellini
> <sstabellini@kernel.org>; Julien Grall <julien@xen.org>; Xen-
> users@lists.xenproject.org; Wei Chen <Wei.Chen@arm.com>; Penny Zheng
> <Penny.Zheng@arm.com>; Luca Fancellu <Luca.Fancellu@arm.com>
> Subject: RE: Aligning Xen to physical memory maps on embedded systems
>=20
> On Mon, 1 Mar 2021, Levenglick Dov wrote:
> > > (+ Penny, Wei and Luca)
> > >
> > > > On 23 Feb 2021, at 01:52, Stefano Stabellini <sstabellini@kernel.=
org>
> wrote:
> > > >
> > > > On Mon, 22 Feb 2021, Levenglick Dov wrote:
> > > >>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of which
> > > >>>> Xen and the DomU have an allocation of 1.25GB, per this memory=

> map:
> > > >>>> 1. DomU1: 0x60000000 - 0x80000000 2. DomU2: 0x40000000 -
> > > >>>> 0x60000000 3. Xen: 0x30000000 - 0x40000000
> > > >>>
> > > >>> How did you tell Xen which regions is assigned to which guests?=

> > > >>> Are your domain mapped 1:1 (i.e guest physical address =3D=3D h=
ost
> > > >>> physical
> > > address)?
> > > >>
> > > >> I am working on a solution where if the "xen,domain" memory has
> > > >> #size-cell cells the content is backward compatible. But if it
> > > >> contains (#address-cells + #size-cells), the address cells shoul=
d
> > > >> be
> > > considered the physical start address.
> > > >> During the mapping of the entire address space insetup_mm(), the=

> > > >> carved out addresses would be added to the  reserved memory
> > > >> address space. When the DomU is to be created, this physical
> > > >> space would be mapped to it. The virtual addresses are less of a=
n
> > > >> issue and needn't be
> > > mapped 1x1 (although they could be).
> > > >
> > > > As of today neither upstream Xen nor the Xilinx Xen tree come wit=
h
> > > > the feature of allowing the specification of an address range for=

> > > > dom0less guests.
> > > >
> > > > The only thing that Xilinx Xen allows, which is not upstream yet,=

> > > > is the ability of creating dom0less guests 1:1 mapped using the "=
direct-
> map"
> > > > property. But the memory allocation is still done by Xen (you
> > > > can't select the addresses).
> > > >
> > > > Some time ago I worked on a hacky prototype to allow the
> > > > specification of address ranges, see:
> > > >
> > > > http://xenbits.xenproject.org/git-http/people/sstabellini/xen-uns=
t
> > > > able .git direct-map-2 from
> > > > 7372466b21c3b6c96bb7a52754e432bac883a1e3
> > > onward.
> > > >
> > > > In particular, have a look at "xen/arm: introduce 1:1 mapping for=

> > > > domUs". The work is not complete: it might not work depending on
> > > > the memory ranges you select for your domUs. In particular, you
> > > > can't select top-of-RAM addresses for your domUs. However, it
> > > > might help you getting started.
> > > >
> > > >
> > > >>>> I am able to support True Dom0-less by means of the patch/hack=

> > > >>>> demonstrated By Stefano Stabellini at
> > > >>> https://youtu.be/UfiP9eAV0WA?t=3D1746.
> > > >>>>
> > > >>>> I was able to forcefully put the Xen binary at the address
> > > >>>> range immediately below 0x40000000 by means of modifying
> > > get_xen_paddr()
> > > >>>> -
> > > >>> in itself an ugly hack.
> > > >>>>
> > > >>>> My questions are:
> > > >>>> 1. Since Xen performs runtime allocations from its heap, it is=

> allocating
> > > >>>>    downwards from 0x80000000 - thereby "stealing" memory from
> > > DomU1.
> > > >>>
> > > >>> In theory, any memory reserved for domains should have been
> > > >>> carved out from the heap allocator. This would be sufficient to=

> > > >>> prevent Xen allocating memory from the ranges you described
> above.
> > > >>>
> > > >>> Therefore, to me this looks like a bug in the tree you are usin=
g.
> > > >>
> > > >> This would be a better approach, but because Xen perform
> > > >> allocations from its heap prior to allocating memory to DomU -
> > > >> and since it allocates from the top of the heap - it is basicall=
y
> > > >> taking memory that I
> > > wanted to set aside for the DomU.
> > > >
> > > > Yeah, this is the main problem that my prototype above couldn't s=
olve.
> >
> > Stephano: Is the approach that I previously described a feasible one?=

> >   1. Mark the addresses that I want to set aside as reserved
> >   2. When reaching the proper DomU, map them and then use the mapping=

> > This approach would solve the heap issue
>=20
> My first suggestion would be actually to let the hypervisor pick the ad=
dress
> ranges. If you don't change setup, you'll see that they are actually st=
able
> across reboot. WARNING: Xen doesn't promise that they are stable;
> however, in practice, they are stable unless you change device tree or
> configuration or software versions.
>=20
> That said, yes, I think your approach might work with some limitations =
(e.g.
> Xen reclaiming memory on domU destruction but you probably don't care
> about that). It could be a decent stopgap until we get a better solutio=
n.

Is DomU destruction an option on true Dom0-less? Who would be doing the d=
estruction?

> From a Xen upstream point of view, it makes sense to follow the approac=
h
> used by Penny, Wei, and Betrand that seems to be the one that is more
> flexible and integrate better with the existing codebase.

I will wait for their response regarding commits and backporting.

> > > Wei and Penny are working on direct map and static allocation to fi=
t
> > > embedded use cases an might have more answer there.
> >
> > Bertrand, Wei and Penny: Is there a "sneak preview"? I'd be happy to
> > start backporting to Xen 4.11
>=20
> As mentioned, there is a 4.13-based Xilinx Xen tree available too.
The information in this e-mail transmission contains proprietary and busi=
ness=20
sensitive information.  Unauthorized interception of this e-mail may cons=
titute=20
a violation of law. If you are not the intended recipient, you are hereby=
=20
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communication is strictly prohibited. You are also asked to contact the s=
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To: xen-users@lists.xenproject.org
From: donoban <donoban@riseup.net>
Subject: Qubes OS freezes with latest kernels
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Date: Tue, 2 Mar 2021 14:22:29 +0100
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Subject: Qubes OS freezes with latest kernels

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Hi,

Some Qubes users are experiencing system freeze [1] (specially with
kernels 5.8 and 5.10) and some stack traces point that the problem could
be related with xen:

[   43.497440] kernel BUG at arch/x86/xen/p2m.c:656!

Any idea about it? How to get more debug info?

Regards.
---

1 - https://github.com/QubesOS/qubes-issues/issues/6397

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From xen-users-bounces@lists.xenproject.org Tue Mar 02 15:29:33 2021
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Date: Mon, 1 Mar 2021 22:13:00 +0100
From: Henrik Riomar <rio@riomar.se>
To: xen-users@lists.xenproject.org
Subject: Re: pci passthrough and msi-x
Message-Id: <20210301221300.994f38f3c58a8ea1ade4a55e@riomar.se>
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On Mon, 1 Mar 2021 09:06:24 +0100
Henrik Riomar <rio@riomar.se> wrote:

> Hi,
> 
> What options are needed to get MSI-X interrupts working with pci passthrough?
> 
> Running Linux 5.10 in dom0 and in the guest with XEN 4.14.1.
> 

Upgrade from Linux 5.10.16 to 5.10.19 seems to solve the issue.

/ Henrik

5.10.19:

[    2.922007] ixgbe: Intel(R) 10 Gigabit PCI Express Network Driver
[    2.922010] ixgbe: Copyright (c) 1999-2016 Intel Corporation.
[    2.934638] ixgbe 0000:00:00.0: Xen PCI mapped GSI17 to IRQ19
[    3.188537] EDAC pnd2: Failed to register device with error -19.
[    3.282965] ixgbe 0000:00:00.0: Multiqueue Enabled: Rx Queue count = 2, Tx Queue count = 2 XDP Queue count = 0
[    3.411026] ixgbe 0000:00:00.0: MAC: 6, PHY: 27, PBA No: 030000-000
[    3.411029] ixgbe 0000:00:00.0: 3c:ec:ef:03:0b:d6
[    3.457704] ixgbe 0000:00:00.0: Intel(R) 10 Gigabit Network Connection
[    3.461237] ixgbe 0000:00:00.1: Xen PCI mapped GSI18 to IRQ23
[    3.943626] ixgbe 0000:00:00.1: Multiqueue Enabled: Rx Queue count = 2, Tx Queue count = 2 XDP Queue count = 0
[    4.081342] ixgbe 0000:00:00.1: MAC: 6, PHY: 27, PBA No: 030000-000
[    4.081347] ixgbe 0000:00:00.1: 3c:ec:ef:03:0b:d7
[    4.125774] ixgbe 0000:00:00.1: Intel(R) 10 Gigabit Network Connection


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	"Xen-users@lists.xenproject.org" <Xen-users@lists.xenproject.org>, Wei Chen
	<Wei.Chen@arm.com>, Penny Zheng <Penny.Zheng@arm.com>, Luca Fancellu
	<Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
In-Reply-To: <85b4a63467c0468583a24ab3858cb97f@elbitsystems.com>
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References: <9017182c5f5c42478d3251dcbba47bda@elbitsystems.com> <56319d7f-39dd-097e-2557-f55b4d5fd5b3@xen.org> <0b72f12c7f2e41b1874892f9a939ddee@elbitsystems.com> <alpine.DEB.2.21.2102221736590.3234@sstabellini-ThinkPad-T480s> <32928DB3-0698-4636-B438-262A8465B067@arm.com>
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On Mon, 1 Mar 2021, Levenglick Dov wrote:
> > (+ Penny, Wei and Luca)
> > 
> > > On 23 Feb 2021, at 01:52, Stefano Stabellini <sstabellini@kernel.org> wrote:
> > >
> > > On Mon, 22 Feb 2021, Levenglick Dov wrote:
> > >>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of which Xen
> > >>>> and the DomU have an allocation of 1.25GB, per this memory map:
> > >>>> 1. DomU1: 0x60000000 - 0x80000000
> > >>>> 2. DomU2: 0x40000000 - 0x60000000
> > >>>> 3. Xen: 0x30000000 - 0x40000000
> > >>>
> > >>> How did you tell Xen which regions is assigned to which guests? Are
> > >>> your domain mapped 1:1 (i.e guest physical address == host physical
> > address)?
> > >>
> > >> I am working on a solution where if the "xen,domain" memory has
> > >> #size-cell cells the content is backward compatible. But if it
> > >> contains (#address-cells + #size-cells), the address cells should be
> > considered the physical start address.
> > >> During the mapping of the entire address space insetup_mm(), the
> > >> carved out addresses would be added to the  reserved memory address
> > >> space. When the DomU is to be created, this physical space would be
> > >> mapped to it. The virtual addresses are less of an issue and needn't be
> > mapped 1x1 (although they could be).
> > >
> > > As of today neither upstream Xen nor the Xilinx Xen tree come with the
> > > feature of allowing the specification of an address range for dom0less
> > > guests.
> > >
> > > The only thing that Xilinx Xen allows, which is not upstream yet, is
> > > the ability of creating dom0less guests 1:1 mapped using the "direct-map"
> > > property. But the memory allocation is still done by Xen (you can't
> > > select the addresses).
> > >
> > > Some time ago I worked on a hacky prototype to allow the specification
> > > of address ranges, see:
> > >
> > > http://xenbits.xenproject.org/git-http/people/sstabellini/xen-unstable
> > > .git direct-map-2 from 7372466b21c3b6c96bb7a52754e432bac883a1e3
> > onward.
> > >
> > > In particular, have a look at "xen/arm: introduce 1:1 mapping for
> > > domUs". The work is not complete: it might not work depending on the
> > > memory ranges you select for your domUs. In particular, you can't
> > > select top-of-RAM addresses for your domUs. However, it might help you
> > > getting started.
> > >
> > >
> > >>>> I am able to support True Dom0-less by means of the patch/hack
> > >>>> demonstrated By Stefano Stabellini at
> > >>> https://youtu.be/UfiP9eAV0WA?t=1746.
> > >>>>
> > >>>> I was able to forcefully put the Xen binary at the address range
> > >>>> immediately below 0x40000000 by means of modifying
> > get_xen_paddr()
> > >>>> -
> > >>> in itself an ugly hack.
> > >>>>
> > >>>> My questions are:
> > >>>> 1. Since Xen performs runtime allocations from its heap, it is allocating
> > >>>>    downwards from 0x80000000 - thereby "stealing" memory from
> > DomU1.
> > >>>
> > >>> In theory, any memory reserved for domains should have been carved
> > >>> out from the heap allocator. This would be sufficient to prevent Xen
> > >>> allocating memory from the ranges you described above.
> > >>>
> > >>> Therefore, to me this looks like a bug in the tree you are using.
> > >>
> > >> This would be a better approach, but because Xen perform allocations
> > >> from its heap prior to allocating memory to DomU - and since it
> > >> allocates from the top of the heap - it is basically taking memory that I
> > wanted to set aside for the DomU.
> > >
> > > Yeah, this is the main problem that my prototype above couldn't solve.
> 
> Stephano: Is the approach that I previously described a feasible one?
>   1. Mark the addresses that I want to set aside as reserved
>   2. When reaching the proper DomU, map them and then use the mapping
> This approach would solve the heap issue

My first suggestion would be actually to let the hypervisor pick the
address ranges. If you don't change setup, you'll see that they are
actually stable across reboot. WARNING: Xen doesn't promise that they
are stable; however, in practice, they are stable unless you change
device tree or configuration or software versions.

That said, yes, I think your approach might work with some limitations
(e.g. Xen reclaiming memory on domU destruction but you probably don't
care about that). It could be a decent stopgap until we get a better
solution.

>From a Xen upstream point of view, it makes sense to follow the approach
used by Penny, Wei, and Betrand that seems to be the one that is more
flexible and integrate better with the existing codebase.



> > Wei and Penny are working on direct map and static allocation to fit
> > embedded use cases an might have more answer there.
> 
> Bertrand, Wei and Penny: Is there a "sneak preview"? I'd be happy to start backporting to Xen 4.11

As mentioned, there is a 4.13-based Xilinx Xen tree available too.


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From: Bertrand Marquis <Bertrand.Marquis@arm.com>
To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
CC: Stefano Stabellini <sstabellini@kernel.org>, Julien Grall
	<julien@xen.org>, "Xen-users@lists.xenproject.org"
	<Xen-users@lists.xenproject.org>, Wei Chen <Wei.Chen@arm.com>, Penny Zheng
	<Penny.Zheng@arm.com>, Luca Fancellu <Luca.Fancellu@arm.com>
Subject: Re: Aligning Xen to physical memory maps on embedded systems
Thread-Topic: Aligning Xen to physical memory maps on embedded systems
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Hi,

> On 1 Mar 2021, at 13:46, Levenglick Dov <Dov.Levenglick@elbitsystems.com>=
 wrote:
>=20
>>=20
>> (+ Penny, Wei and Luca)
>>=20
>>> On 23 Feb 2021, at 01:52, Stefano Stabellini <sstabellini@kernel.org> w=
rote:
>>>=20
>>> On Mon, 22 Feb 2021, Levenglick Dov wrote:
>>>>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of which Xen
>>>>>> and the DomU have an allocation of 1.25GB, per this memory map:
>>>>>> 1. DomU1: 0x60000000 - 0x80000000
>>>>>> 2. DomU2: 0x40000000 - 0x60000000
>>>>>> 3. Xen: 0x30000000 - 0x40000000
>>>>>=20
>>>>> How did you tell Xen which regions is assigned to which guests? Are
>>>>> your domain mapped 1:1 (i.e guest physical address =3D=3D host physic=
al
>> address)?
>>>>=20
>>>> I am working on a solution where if the "xen,domain" memory has
>>>> #size-cell cells the content is backward compatible. But if it
>>>> contains (#address-cells + #size-cells), the address cells should be
>> considered the physical start address.
>>>> During the mapping of the entire address space insetup_mm(), the
>>>> carved out addresses would be added to the  reserved memory address
>>>> space. When the DomU is to be created, this physical space would be
>>>> mapped to it. The virtual addresses are less of an issue and needn't b=
e
>> mapped 1x1 (although they could be).
>>>=20
>>> As of today neither upstream Xen nor the Xilinx Xen tree come with the
>>> feature of allowing the specification of an address range for dom0less
>>> guests.
>>>=20
>>> The only thing that Xilinx Xen allows, which is not upstream yet, is
>>> the ability of creating dom0less guests 1:1 mapped using the "direct-ma=
p"
>>> property. But the memory allocation is still done by Xen (you can't
>>> select the addresses).
>>>=20
>>> Some time ago I worked on a hacky prototype to allow the specification
>>> of address ranges, see:
>>>=20
>>> http://xenbits.xenproject.org/git-http/people/sstabellini/xen-unstable
>>> .git direct-map-2 from 7372466b21c3b6c96bb7a52754e432bac883a1e3
>> onward.
>>>=20
>>> In particular, have a look at "xen/arm: introduce 1:1 mapping for
>>> domUs". The work is not complete: it might not work depending on the
>>> memory ranges you select for your domUs. In particular, you can't
>>> select top-of-RAM addresses for your domUs. However, it might help you
>>> getting started.
>>>=20
>>>=20
>>>>>> I am able to support True Dom0-less by means of the patch/hack
>>>>>> demonstrated By Stefano Stabellini at
>>>>> https://youtu.be/UfiP9eAV0WA?t=3D1746.
>>>>>>=20
>>>>>> I was able to forcefully put the Xen binary at the address range
>>>>>> immediately below 0x40000000 by means of modifying
>> get_xen_paddr()
>>>>>> -
>>>>> in itself an ugly hack.
>>>>>>=20
>>>>>> My questions are:
>>>>>> 1. Since Xen performs runtime allocations from its heap, it is alloc=
ating
>>>>>>   downwards from 0x80000000 - thereby "stealing" memory from
>> DomU1.
>>>>>=20
>>>>> In theory, any memory reserved for domains should have been carved
>>>>> out from the heap allocator. This would be sufficient to prevent Xen
>>>>> allocating memory from the ranges you described above.
>>>>>=20
>>>>> Therefore, to me this looks like a bug in the tree you are using.
>>>>=20
>>>> This would be a better approach, but because Xen perform allocations
>>>> from its heap prior to allocating memory to DomU - and since it
>>>> allocates from the top of the heap - it is basically taking memory tha=
t I
>> wanted to set aside for the DomU.
>>>=20
>>> Yeah, this is the main problem that my prototype above couldn't solve.
>=20
> Stephano: Is the approach that I previously described a feasible one?
>  1. Mark the addresses that I want to set aside as reserved
>  2. When reaching the proper DomU, map them and then use the mapping
> This approach would solve the heap issue
>>>=20
>>=20
>> Wei and Penny are working on direct map and static allocation to fit
>> embedded use cases an might have more answer there.
>=20
> Bertrand, Wei and Penny: Is there a "sneak preview"? I'd be happy to star=
t backporting to Xen 4.11

I am afraid we are not at this stage, we are on early development on this.

>=20
>>=20
>> On the fix from Stefano explained in the video, Luca Fancellu made a pat=
ch to
>> propose a long term solution and will push it upstream next week.
>=20
> Bertrand: Do You know which commit ID this is? Since I'm working on a Xil=
inx fork, I am out of touch with the goings of the main tree.

This will be pushed to the xen-devel mailing list next week.

Cheers
Bertrand

>=20
>=20
> Thanks,
> Dov
> The information in this e-mail transmission contains proprietary and busi=
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Date: Tue, 2 Mar 2021 11:35:41 -0800
From: Stefano Stabellini <stefano.stabellini@xilinx.com>
X-X-Sender: sstabellini@sstabellini-ThinkPad-T480s
To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
CC: Stefano Stabellini <stefano.stabellini@xilinx.com>, Bertrand Marquis
	<Bertrand.Marquis@arm.com>, Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>, "Xen-users@lists.xenproject.org"
	<Xen-users@lists.xenproject.org>, Wei Chen <Wei.Chen@arm.com>, Penny Zheng
	<Penny.Zheng@arm.com>, Luca Fancellu <Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
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On Tue, 2 Mar 2021, Levenglick Dov wrote:
> Thank you.
> A few final comments below + one last question regarding the Xilinx forks:
> Xen 4.13 is first available on the 2020.1 branch. Is it required that the 2020.1 branch of linux-xlnx be used as well, or can I keep the 2019.1 branch that I am currently using?

Xilinx recommends to always use the same version everywhere, so 2020.1
for Xen, Linux, firwmare, etc.

That said, it should be no problem to use Xen 2020.1 with everything
else from 2019.1. Given that you are using dom0less, you just need to
rebuild the Xen hypervisor alone, you don't even need to update the dom0
rootfs.


> > -----Original Message-----
> > From: Stefano Stabellini <stefano.stabellini@xilinx.com>
> > Sent: Tuesday, March 2, 2021 3:42 AM
> > To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
> > Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>; Stefano Stabellini
> > <sstabellini@kernel.org>; Julien Grall <julien@xen.org>; Xen-
> > users@lists.xenproject.org; Wei Chen <Wei.Chen@arm.com>; Penny Zheng
> > <Penny.Zheng@arm.com>; Luca Fancellu <Luca.Fancellu@arm.com>
> > Subject: RE: Aligning Xen to physical memory maps on embedded systems
> > 
> > On Mon, 1 Mar 2021, Levenglick Dov wrote:
> > > > (+ Penny, Wei and Luca)
> > > >
> > > > > On 23 Feb 2021, at 01:52, Stefano Stabellini <sstabellini@kernel.org>
> > wrote:
> > > > >
> > > > > On Mon, 22 Feb 2021, Levenglick Dov wrote:
> > > > >>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of which
> > > > >>>> Xen and the DomU have an allocation of 1.25GB, per this memory
> > map:
> > > > >>>> 1. DomU1: 0x60000000 - 0x80000000 2. DomU2: 0x40000000 -
> > > > >>>> 0x60000000 3. Xen: 0x30000000 - 0x40000000
> > > > >>>
> > > > >>> How did you tell Xen which regions is assigned to which guests?
> > > > >>> Are your domain mapped 1:1 (i.e guest physical address == host
> > > > >>> physical
> > > > address)?
> > > > >>
> > > > >> I am working on a solution where if the "xen,domain" memory has
> > > > >> #size-cell cells the content is backward compatible. But if it
> > > > >> contains (#address-cells + #size-cells), the address cells should
> > > > >> be
> > > > considered the physical start address.
> > > > >> During the mapping of the entire address space insetup_mm(), the
> > > > >> carved out addresses would be added to the  reserved memory
> > > > >> address space. When the DomU is to be created, this physical
> > > > >> space would be mapped to it. The virtual addresses are less of an
> > > > >> issue and needn't be
> > > > mapped 1x1 (although they could be).
> > > > >
> > > > > As of today neither upstream Xen nor the Xilinx Xen tree come with
> > > > > the feature of allowing the specification of an address range for
> > > > > dom0less guests.
> > > > >
> > > > > The only thing that Xilinx Xen allows, which is not upstream yet,
> > > > > is the ability of creating dom0less guests 1:1 mapped using the "direct-
> > map"
> > > > > property. But the memory allocation is still done by Xen (you
> > > > > can't select the addresses).
> > > > >
> > > > > Some time ago I worked on a hacky prototype to allow the
> > > > > specification of address ranges, see:
> > > > >
> > > > > http://xenbits.xenproject.org/git-http/people/sstabellini/xen-unst
> > > > > able .git direct-map-2 from
> > > > > 7372466b21c3b6c96bb7a52754e432bac883a1e3
> > > > onward.
> > > > >
> > > > > In particular, have a look at "xen/arm: introduce 1:1 mapping for
> > > > > domUs". The work is not complete: it might not work depending on
> > > > > the memory ranges you select for your domUs. In particular, you
> > > > > can't select top-of-RAM addresses for your domUs. However, it
> > > > > might help you getting started.
> > > > >
> > > > >
> > > > >>>> I am able to support True Dom0-less by means of the patch/hack
> > > > >>>> demonstrated By Stefano Stabellini at
> > > > >>> https://youtu.be/UfiP9eAV0WA?t=1746.
> > > > >>>>
> > > > >>>> I was able to forcefully put the Xen binary at the address
> > > > >>>> range immediately below 0x40000000 by means of modifying
> > > > get_xen_paddr()
> > > > >>>> -
> > > > >>> in itself an ugly hack.
> > > > >>>>
> > > > >>>> My questions are:
> > > > >>>> 1. Since Xen performs runtime allocations from its heap, it is
> > allocating
> > > > >>>>    downwards from 0x80000000 - thereby "stealing" memory from
> > > > DomU1.
> > > > >>>
> > > > >>> In theory, any memory reserved for domains should have been
> > > > >>> carved out from the heap allocator. This would be sufficient to
> > > > >>> prevent Xen allocating memory from the ranges you described
> > above.
> > > > >>>
> > > > >>> Therefore, to me this looks like a bug in the tree you are using.
> > > > >>
> > > > >> This would be a better approach, but because Xen perform
> > > > >> allocations from its heap prior to allocating memory to DomU -
> > > > >> and since it allocates from the top of the heap - it is basically
> > > > >> taking memory that I
> > > > wanted to set aside for the DomU.
> > > > >
> > > > > Yeah, this is the main problem that my prototype above couldn't solve.
> > >
> > > Stephano: Is the approach that I previously described a feasible one?
> > >   1. Mark the addresses that I want to set aside as reserved
> > >   2. When reaching the proper DomU, map them and then use the mapping
> > > This approach would solve the heap issue
> > 
> > My first suggestion would be actually to let the hypervisor pick the address
> > ranges. If you don't change setup, you'll see that they are actually stable
> > across reboot. WARNING: Xen doesn't promise that they are stable;
> > however, in practice, they are stable unless you change device tree or
> > configuration or software versions.
> > 
> > That said, yes, I think your approach might work with some limitations (e.g.
> > Xen reclaiming memory on domU destruction but you probably don't care
> > about that). It could be a decent stopgap until we get a better solution.
> 
> Is DomU destruction an option on true Dom0-less? Who would be doing the destruction?

Destruction, yes. You should be able to use "xl destroy" in Dom0 already
today to destroy a dom0less domU. Pass a domid instead of domain name
(they don't have a domain name). Of course you need the xl tools in the
Xen rootfs for that, so if you are going to update Xen, then you also
need to update the Xen tools, hence the Dom0 rootfs. The Xen tools and
Xen actually need to be of the same version.

If you intend to create again a dom0less domain after destroying it
(reboot), then you need to have a config file in dom0 with the same
configuration so that you can call xl create.


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From: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
To: Wei Chen <Wei.Chen@arm.com>, Stefano Stabellini
	<stefano.stabellini@xilinx.com>
CC: Bertrand Marquis <Bertrand.Marquis@arm.com>, Stefano Stabellini
	<sstabellini@kernel.org>, Julien Grall <julien@xen.org>,
	"Xen-users@lists.xenproject.org" <Xen-users@lists.xenproject.org>, "Penny
 Zheng" <Penny.Zheng@arm.com>, Luca Fancellu <Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
Thread-Topic: Aligning Xen to physical memory maps on embedded systems
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Thank you all

Dov


> -----Original Message-----
> From: Wei Chen <Wei.Chen@arm.com>
> Sent: Wednesday, March 3, 2021 8:43 AM
> To: Stefano Stabellini <stefano.stabellini@xilinx.com>; Levenglick Dov
> <Dov.Levenglick@elbitsystems.com>
> Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>; Stefano Stabellini
> <sstabellini@kernel.org>; Julien Grall <julien@xen.org>; Xen-
> users@lists.xenproject.org; Penny Zheng <Penny.Zheng@arm.com>; Luca
> Fancellu <Luca.Fancellu@arm.com>
> Subject: RE: Aligning Xen to physical memory maps on embedded systems
>=20
> Hi,
>=20
> Sorry to reply late. This e-mail had been filtered by my e-mail client.=

> We have been working on direct mapping and static allocation for a whil=
e.
> And Penny had sent an initial version of direct mapping design document=
=20to
> mailing list in last December.
>=20
> Now, we are working on a new version design document, the new version
> design will address the feedbacks we have got from the initial version =
and
> will also include the design of static allocation. This document is nea=
ring
> completion and we will be submitting it to the community for discussion=
=20in
> the next week or two. Once we have some conclusions, we will soon be
> submitting our code to the community to collect the RFC.
>=20
> Besides, I have some comments below:
>=20
> > -----Original Message-----
> > From: Stefano Stabellini <stefano.stabellini@xilinx.com>
> > Sent: 2021=1B$BG/=1B(B3=1B$B7n=1B(B3=1B$BF|=1B(B 3:36
> > To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
> > Cc: Stefano Stabellini <stefano.stabellini@xilinx.com>; Bertrand
> > Marquis <Bertrand.Marquis@arm.com>; Stefano Stabellini
> > <sstabellini@kernel.org>; Julien Grall <julien@xen.org>;
> > Xen-users@lists.xenproject.org; Wei Chen <Wei.Chen@arm.com>; Penny
> > Zheng <Penny.Zheng@arm.com>; Luca Fancellu <Luca.Fancellu@arm.com>
> > Subject: RE: Aligning Xen to physical memory maps on embedded systems=

> >
> > On Tue, 2 Mar 2021, Levenglick Dov wrote:
> > > Thank you.
> > > A few final comments below + one last question regarding the Xilinx=

> forks:
> > > Xen 4.13 is first available on the 2020.1 branch. Is it required
> > > that the 2020.1
> > branch of linux-xlnx be used as well, or can I keep the 2019.1 branch=

> > that I am currently using?
> >
> > Xilinx recommends to always use the same version everywhere, so 2020.=
1
> > for Xen, Linux, firwmare, etc.
> >
> > That said, it should be no problem to use Xen 2020.1 with everything
> > else from 2019.1. Given that you are using dom0less, you just need to=

> > rebuild the Xen hypervisor alone, you don't even need to update the
> > dom0 rootfs.
> >
> >
> > > > -----Original Message-----
> > > > From: Stefano Stabellini <stefano.stabellini@xilinx.com>
> > > > Sent: Tuesday, March 2, 2021 3:42 AM
> > > > To: Levenglick Dov <Dov.Levenglick@elbitsystems.com>
> > > > Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>; Stefano
> > > > Stabellini <sstabellini@kernel.org>; Julien Grall
> > > > <julien@xen.org>; Xen- users@lists.xenproject.org; Wei Chen
> > > > <Wei.Chen@arm.com>; Penny Zheng <Penny.Zheng@arm.com>; Luca
> > > > Fancellu <Luca.Fancellu@arm.com>
> > > > Subject: RE: Aligning Xen to physical memory maps on embedded
> > > > systems
> > > >
> > > > On Mon, 1 Mar 2021, Levenglick Dov wrote:
> > > > > > (+ Penny, Wei and Luca)
> > > > > >
> > > > > > > On 23 Feb 2021, at 01:52, Stefano Stabellini
> > > > > > > <sstabellini@kernel.org>
> > > > wrote:
> > > > > > >
> > > > > > > On Mon, 22 Feb 2021, Levenglick Dov wrote:
> > > > > > >>>> The system has 2GB of RAM (0x00000000 - 0x80000000) of
> > > > > > >>>> which Xen and the DomU have an allocation of 1.25GB, per=

> > > > > > >>>> this memory
> > > > map:
> > > > > > >>>> 1. DomU1: 0x60000000 - 0x80000000 2. DomU2: 0x40000000 -=

> > > > > > >>>> 0x60000000 3. Xen: 0x30000000 - 0x40000000
> > > > > > >>>
> > > > > > >>> How did you tell Xen which regions is assigned to which g=
uests?
> > > > > > >>> Are your domain mapped 1:1 (i.e guest physical address =3D=
=3D
> > > > > > >>> host physical
> > > > > > address)?
> > > > > > >>
> > > > > > >> I am working on a solution where if the "xen,domain" memor=
y
> > > > > > >> has #size-cell cells the content is backward compatible.
> > > > > > >> But if it contains (#address-cells + #size-cells), the
> > > > > > >> address cells should be
> > > > > > considered the physical start address.
> > > > > > >> During the mapping of the entire address space
> > > > > > >> insetup_mm(), the carved out addresses would be added to
> > > > > > >> the  reserved memory address space. When the DomU is to be=

> > > > > > >> created, this physical space would be mapped to it. The
> > > > > > >> virtual addresses are less of an issue and needn't be
> > > > > > mapped 1x1 (although they could be).
> > > > > > >
> > > > > > > As of today neither upstream Xen nor the Xilinx Xen tree
> > > > > > > come with the feature of allowing the specification of an
> > > > > > > address range for dom0less guests.
> > > > > > >
> > > > > > > The only thing that Xilinx Xen allows, which is not upstrea=
m
> > > > > > > yet, is the ability of creating dom0less guests 1:1 mapped
> > > > > > > using the "direct-
> > > > map"
> > > > > > > property. But the memory allocation is still done by Xen
> > > > > > > (you can't select the addresses).
> > > > > > >
> > > > > > > Some time ago I worked on a hacky prototype to allow the
> > > > > > > specification of address ranges, see:
> > > > > > >
> > > > > > > http://xenbits.xenproject.org/git-http/people/sstabellini/x=
e
> > > > > > > n-unst
> > > > > > > able .git direct-map-2 from
> > > > > > > 7372466b21c3b6c96bb7a52754e432bac883a1e3
> > > > > > onward.
> > > > > > >
> > > > > > > In particular, have a look at "xen/arm: introduce 1:1
> > > > > > > mapping for domUs". The work is not complete: it might not
> > > > > > > work depending on the memory ranges you select for your
> > > > > > > domUs. In particular, you can't select top-of-RAM addresses=

> > > > > > > for your domUs. However, it might help you getting started.=

> > > > > > >
> > > > > > >
> > > > > > >>>> I am able to support True Dom0-less by means of the
> > > > > > >>>> patch/hack demonstrated By Stefano Stabellini at
> > > > > > >>> https://youtu.be/UfiP9eAV0WA?t=3D1746.
> > > > > > >>>>
> > > > > > >>>> I was able to forcefully put the Xen binary at the
> > > > > > >>>> address range immediately below 0x40000000 by means of
> > > > > > >>>> modifying
> > > > > > get_xen_paddr()
> > > > > > >>>> -
> > > > > > >>> in itself an ugly hack.
> > > > > > >>>>
> > > > > > >>>> My questions are:
> > > > > > >>>> 1. Since Xen performs runtime allocations from its heap,=

> > > > > > >>>> it is
> > > > allocating
> > > > > > >>>>    downwards from 0x80000000 - thereby "stealing" memory=

> > > > > > >>>> from
> > > > > > DomU1.
> > > > > > >>>
> > > > > > >>> In theory, any memory reserved for domains should have
> > > > > > >>> been carved out from the heap allocator. This would be
> > > > > > >>> sufficient to prevent Xen allocating memory from the
> > > > > > >>> ranges you described
> > > > above.
> > > > > > >>>
> > > > > > >>> Therefore, to me this looks like a bug in the tree you ar=
e using.
> > > > > > >>
> > > > > > >> This would be a better approach, but because Xen perform
> > > > > > >> allocations from its heap prior to allocating memory to
> > > > > > >> DomU - and since it allocates from the top of the heap - i=
t
> > > > > > >> is basically taking memory that I
> > > > > > wanted to set aside for the DomU.
> > > > > > >
> > > > > > > Yeah, this is the main problem that my prototype above coul=
dn't
> solve.
> > > > >
> > > > > Stephano: Is the approach that I previously described a feasibl=
e one?
> > > > >   1. Mark the addresses that I want to set aside as reserved
> > > > >   2. When reaching the proper DomU, map them and then use the
> > > > > mapping This approach would solve the heap issue
> > > >
> > > > My first suggestion would be actually to let the hypervisor pick
> > > > the address ranges. If you don't change setup, you'll see that
> > > > they are actually stable across reboot. WARNING: Xen doesn't
> > > > promise that they are stable; however, in practice, they are
> > > > stable unless you change device tree or configuration or software=

> versions.
> > > >
> > > > That said, yes, I think your approach might work with some limita=
tions
> (e.g.
> > > > Xen reclaiming memory on domU destruction but you probably don't
> > > > care about that). It could be a decent stopgap until we get a bet=
ter
> solution.
> > >
>=20
> In our new design, the user defined memory ranges for DomU and memory
> reclaiming on DomU destruction have been considered already. These are
> two features that we really want the community to discuss and get feedb=
ack
> on.
>=20
> > > Is DomU destruction an option on true Dom0-less? Who would be doing=

> > > the
> > destruction?
> >
> > Destruction, yes. You should be able to use "xl destroy" in Dom0
> > already today to destroy a dom0less domU. Pass a domid instead of
> > domain name (they don't have a domain name). Of course you need the x=
l
> > tools in the Xen rootfs for that, so if you are going to update Xen,
> > then you also need to update the Xen tools, hence the Dom0 rootfs. Th=
e
> > Xen tools and Xen actually need to be of the same version.
> >
> > If you intend to create again a dom0less domain after destroying it
> > (reboot), then you need to have a config file in dom0 with the same
> > configuration so that you can call xl create.
>=20
> Cheers,
> Wei Chen
>=20

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a violation of law. If you are not the intended recipient, you are hereby=
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notified that any review, dissemination, distribution or duplication of t=
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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 367 v1 - Linux: netback fails to honor
 grant mapping errors
Message-Id: <E1lHlOS-0000Se-RY@xenbits.xenproject.org>
Date: Thu, 04 Mar 2021 10:39:44 +0000

--=separator
Content-Type: text/plain; charset="utf-8"
Content-Disposition: inline
Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

                    Xen Security Advisory XSA-367

          Linux: netback fails to honor grant mapping errors

ISSUE DESCRIPTION
=================

XSA-362 tried to address issues here, but in the case of the netback
driver the changes were insufficient: It left the relevant function
invocation with, effectively, no error handling at all.  As a result,
memory allocation failures there could still lead to frontend-induced
crashes of the backend.

IMPACT
======

A malicious or buggy networking frontend driver may be able to crash
the corresponding backend driver, potentially affecting the entire
domain running the backend driver.  In a typical (non-disaggregated)
system that is a host-wide denial of service (DoS).

VULNERABLE SYSTEMS
==================

Linux versions from at least 2.6.39 onwards are vulnerable, when run in
PV mode.  Earlier versions differ significantly in behavior and may
therefore instead surface other issues under the same conditions.  Linux
run in HVM / PVH modes is not vulnerable.

MITIGATION
==========

For Linux, running the backends in HVM or PVH domains will avoid the
vulnerability.  For example, by running the dom0 in PVH mode.

In all other cases there is no known mitigation.

RESOLUTION
==========

Applying the attached patch resolves this issue.

xsa367-linux.patch           Linux 5.12-rc

$ sha256sum xsa367*
b0244bfddee91cd7986172893e70664b74e698c5d44f25865870f179f80f9a92  xsa367-linux.patch
$

CREDITS
=======

This issue was reported by Intel's kernel test robot and recognized as a
security issue by Jan Beulich of SUSE.

NOTE REGARDING LACK OF EMBARGO
==============================

This issue was reported publicly, before the XSA could be issued.
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To: xen-announce@lists.xen.org, xen-devel@lists.xen.org,
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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 369 v1 - Linux: special config may crash
 when trying to map foreign pages
Message-Id: <E1lHlgJ-0003KK-Ms@xenbits.xenproject.org>
Date: Thu, 04 Mar 2021 10:58:11 +0000

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

                    Xen Security Advisory XSA-369

   Linux: special config may crash when trying to map foreign pages

ISSUE DESCRIPTION
=================

With CONFIG_XEN_BALLOON_MEMORY_HOTPLUG disabled and
CONFIG_XEN_UNPOPULATED_ALLOC enabled the Linux kernel will use guest
physical addresses allocated via the ZONE_DEVICE functionality for
mapping foreign guest's pages.

This will result in problems, as the p2m list will only cover the initial
memory size of the domain plus some padding at the end. Most ZONE_DEVICE
allocated addresses will be outside the p2m range and thus a mapping can't
be established with those memory addresses, resulting in a crash.

The attack involves doing I/O requiring large amounts of data to be
mapped by the Dom0 or driver domain.  The amount of data needed to
result in a crash can vary depending on the memory layout of the
affected Dom0 or driver domain.

IMPACT
======

A Dom0 or driver domain based on a Linux kernel (configured as
described above) can be crashed by a malicious guest administrator, or
possibly malicious unprivileged guest processes.

VULNERABLE SYSTEMS
==================

Only x86 paravirtualized (PV) Dom0 or driver domains are
affected.

Only Linux kernels configured *with* CONFIG_XEN_UNPOPULATED_ALLOC and
*without* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG are vulnerable.  Only
kernels from kernel version 5.9 onwards are affected.

CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is enabled by default in upstream
Linux when Xen support is enabled, so kernels using upstream default
Kconfig are not affected.  Most distribution kernels supporting Xen
dom0 use are likewise not vulnerable.

Arm systems or x86 PVH or x86 HVM driver domains are not affected.

MITIGATION
==========

There is no mitigation available.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

xsa369-linux.patch           Linux 5.9-stable - 5.12-rc

$ sha256sum xsa369*
937df4f078a070cf47bdd718c6b8a042ec6bee255eedc422d833c2ae3dd561c7  xsa369-linux.patch
$

CREDITS
=======

This issue was discovered by Marek Marczykowski-Górecki of Invisible
Things Lab.

For patch:
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

NOTE REGARDING LACK OF EMBARGO
==============================

This was reported publicly multiple times, before the XSA could be
issued.
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Subject: Re: dom0less boot two compressed kernel images out-of-memory
 work-around
To: Charles Chiou <cchiou@ambarella.com>,
 "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
References: <c1b3f92388c34788b76193b70c150521@ambarella.com>
Cc: Jan Beulich <jbeulich@suse.com>,
 Stefano Stabellini <sstabellini@kernel.org>, Ian Jackson
 <iwj@xenproject.org>, Andrew Cooper <andrew.cooper3@citrix.com>
From: Julien Grall <julien@xen.org>
Message-ID: <58aaf68f-4499-9400-6eb2-f1ad3b620c73@xen.org>
Date: Wed, 3 Mar 2021 19:36:31 +0000
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(BCCing xen-users, CCing xen-devel + a few folks)

Hi,

Moving the discussion to xen-devel.

On 22/02/2021 05:02, Charles Chiou wrote:
> When trying to boot two zImage using dom0less boot on ARM, we encountered this problem when xen runs gunzip on second guest:
> 
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Out of memory
> (XEN) ****************************************
> 
> And worked around it with the following patch. We'd like to check to see if this is a known issue and if the work-around looks reasonable. Thank you

I haven't seen any similar report in the past.

> 
> 
> diff --git a/xen/common/gunzip.c b/xen/common/gunzip.c
> index db4efcd34b..e5bd19ba7f 100644
> --- a/xen/common/gunzip.c
> +++ b/xen/common/gunzip.c
> @@ -113,8 +113,10 @@ __init int perform_gunzip(char *output, char *image, unsigned long image_len)
> 
>       window = (unsigned char *)output;
> 
> +    if (!free_mem_ptr) {
>           free_mem_ptr = (unsigned long)alloc_xenheap_pages(HEAPORDER, 0);
>           free_mem_end_ptr = free_mem_ptr + (PAGE_SIZE << HEAPORDER);
> +    }
> 
>       inbuf = (unsigned char *)image;
>       insize = image_len;
> @@ -131,7 +133,12 @@ __init int perform_gunzip(char *output, char *image, unsigned long image_len)
>           rc = 0;
>       }
> 
> +    if (free_mem_ptr) {
>           free_xenheap_pages((void *)free_mem_ptr, HEAPORDER);
> +        free_mem_ptr = 0;
> +    }
> +
> +    bytes_out = 0;
> 
>       return rc;
> }
> diff --git a/xen/common/inflate.c b/xen/common/inflate.c
> index f99c985d61..de96002188 100644
> --- a/xen/common/inflate.c
> +++ b/xen/common/inflate.c
> @@ -244,7 +244,7 @@ static void *INIT malloc(int size)
> 
>       if (size < 0)
>           error("Malloc error");
> -    if (!malloc_ptr)
> +    if ((!malloc_ptr) || (!malloc_count))
>           malloc_ptr = free_mem_ptr;
> 

IMHO, this is a bit risky to assume that malloc_count will always be 0 
after each gunzip.

Instead I think, it would be better if we re-initialize the allocator 
every time. How about the following (untested):

commit e1cd2d85234c8d0aa62ad32c824a5568a57be930 (HEAD -> dev)
Author: Julien Grall <jgrall@amazon.com>
Date:   Wed Mar 3 19:27:56 2021 +0000

     xen/gunzip: Allow perform_gunzip() to be called multiple times

     Currently perform_gunzip() can only be called once because the the
     internal allocator is not fully re-initialized.

     This works fine if you are only booting dom0. But this will break when
     booting multiple using the dom0less that uses compressed kernel images.

     This can be resolved by re-initializing malloc_ptr and malloc_count
     every time perform_gunzip() is called.

     Note the latter is only re-initialized for hardening purpose as 
there is
     no guarantee that every malloc() are followed by free() (It should in
     theory!).

     Take the opportunity to check the return of alloc_heap_pages() to 
return
     an error rather than dereferencing a NULL pointer later on failure.

     Reported-by: Charles Chiou <cchiou@ambarella.com>
     Signed-off-by: Julien Grall <jgrall@amazon.com>

     ---

     This patch is candidate for Xen 4.15. Without this patch, it will 
not be
     possible to boot multiple domain using dom0less when they are using
     compressed kernel images.

diff --git a/xen/common/gunzip.c b/xen/common/gunzip.c
index db4efcd34b77..a5c2e25efc0f 100644
--- a/xen/common/gunzip.c
+++ b/xen/common/gunzip.c
@@ -114,7 +114,11 @@ __init int perform_gunzip(char *output, char 
*image, unsigned long image_len)
      window = (unsigned char *)output;

      free_mem_ptr = (unsigned long)alloc_xenheap_pages(HEAPORDER, 0);
+    if ( !free_mem_ptr )
+        return -ENOMEM;
+
      free_mem_end_ptr = free_mem_ptr + (PAGE_SIZE << HEAPORDER);
+    init_allocator();

      inbuf = (unsigned char *)image;
      insize = image_len;
diff --git a/xen/common/inflate.c b/xen/common/inflate.c
index f99c985d6135..d8c28a3e9593 100644
--- a/xen/common/inflate.c
+++ b/xen/common/inflate.c
@@ -238,6 +238,12 @@ STATIC const ush mask_bits[] = {
  static unsigned long INITDATA malloc_ptr;
  static int INITDATA malloc_count;

+static void init_allocator(void)
+{
+    malloc_ptr = free_mem_ptr;
+    malloc_count = 0;
+}
+
  static void *INIT malloc(int size)
  {
      void *p;

Best regards,

-- 
Julien Grall


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To: Stefano Stabellini <stefano.stabellini@xilinx.com>, Levenglick Dov
	<Dov.Levenglick@elbitsystems.com>
CC: Bertrand Marquis <Bertrand.Marquis@arm.com>, Stefano Stabellini
	<sstabellini@kernel.org>, Julien Grall <julien@xen.org>,
	"Xen-users@lists.xenproject.org" <Xen-users@lists.xenproject.org>, Penny
 Zheng <Penny.Zheng@arm.com>, Luca Fancellu <Luca.Fancellu@arm.com>
Subject: RE: Aligning Xen to physical memory maps on embedded systems
Thread-Topic: Aligning Xen to physical memory maps on embedded systems
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To: xen-announce@lists.xen.org, xen-devel@lists.xen.org,
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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 367 v2 (CVE-2021-28038) - Linux: netback
 fails to honor grant mapping errors
Message-Id: <E1lIDvZ-0006Cd-QZ@xenbits.xenproject.org>
Date: Fri, 05 Mar 2021 17:07:49 +0000

--=separator
Content-Type: text/plain; charset="utf-8"
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Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

            Xen Security Advisory CVE-2021-28038 / XSA-367
                              version 2

          Linux: netback fails to honor grant mapping errors

UPDATES IN VERSION 2
====================

CVE assigned.

ISSUE DESCRIPTION
=================

XSA-362 tried to address issues here, but in the case of the netback
driver the changes were insufficient: It left the relevant function
invocation with, effectively, no error handling at all.  As a result,
memory allocation failures there could still lead to frontend-induced
crashes of the backend.

IMPACT
======

A malicious or buggy networking frontend driver may be able to crash
the corresponding backend driver, potentially affecting the entire
domain running the backend driver.  In a typical (non-disaggregated)
system that is a host-wide denial of service (DoS).

VULNERABLE SYSTEMS
==================

Linux versions from at least 2.6.39 onwards are vulnerable, when run in
PV mode.  Earlier versions differ significantly in behavior and may
therefore instead surface other issues under the same conditions.  Linux
run in HVM / PVH modes is not vulnerable.

MITIGATION
==========

For Linux, running the backends in HVM or PVH domains will avoid the
vulnerability.  For example, by running the dom0 in PVH mode.

In all other cases there is no known mitigation.

RESOLUTION
==========

Applying the attached patch resolves this issue.

xsa367-linux.patch           Linux 5.12-rc

$ sha256sum xsa367*
b0244bfddee91cd7986172893e70664b74e698c5d44f25865870f179f80f9a92  xsa367-linux.patch
$

CREDITS
=======

This issue was reported by Intel's kernel test robot and recognized as a
security issue by Jan Beulich of SUSE.

NOTE REGARDING LACK OF EMBARGO
==============================

This issue was reported publicly, before the XSA could be issued.
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To: xen-announce@lists.xen.org, xen-devel@lists.xen.org,
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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 369 v2 (CVE-2021-28039) - Linux: special
 config may crash when trying to map foreign pages
Message-Id: <E1lIDvd-0006DY-2i@xenbits.xenproject.org>
Date: Fri, 05 Mar 2021 17:07:53 +0000

--=separator
Content-Type: text/plain; charset="utf-8"
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Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

            Xen Security Advisory CVE-2021-28039 / XSA-369
                              version 2

   Linux: special config may crash when trying to map foreign pages

UPDATES IN VERSION 2
====================

CVE assigned.

ISSUE DESCRIPTION
=================

With CONFIG_XEN_BALLOON_MEMORY_HOTPLUG disabled and
CONFIG_XEN_UNPOPULATED_ALLOC enabled the Linux kernel will use guest
physical addresses allocated via the ZONE_DEVICE functionality for
mapping foreign guest's pages.

This will result in problems, as the p2m list will only cover the initial
memory size of the domain plus some padding at the end. Most ZONE_DEVICE
allocated addresses will be outside the p2m range and thus a mapping can't
be established with those memory addresses, resulting in a crash.

The attack involves doing I/O requiring large amounts of data to be
mapped by the Dom0 or driver domain.  The amount of data needed to
result in a crash can vary depending on the memory layout of the
affected Dom0 or driver domain.

IMPACT
======

A Dom0 or driver domain based on a Linux kernel (configured as
described above) can be crashed by a malicious guest administrator, or
possibly malicious unprivileged guest processes.

VULNERABLE SYSTEMS
==================

Only x86 paravirtualized (PV) Dom0 or driver domains are
affected.

Only Linux kernels configured *with* CONFIG_XEN_UNPOPULATED_ALLOC and
*without* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG are vulnerable.  Only
kernels from kernel version 5.9 onwards are affected.

CONFIG_XEN_BALLOON_MEMORY_HOTPLUG is enabled by default in upstream
Linux when Xen support is enabled, so kernels using upstream default
Kconfig are not affected.  Most distribution kernels supporting Xen
dom0 use are likewise not vulnerable.

Arm systems or x86 PVH or x86 HVM driver domains are not affected.

MITIGATION
==========

There is no mitigation available.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

xsa369-linux.patch           Linux 5.9-stable - 5.12-rc

$ sha256sum xsa369*
937df4f078a070cf47bdd718c6b8a042ec6bee255eedc422d833c2ae3dd561c7  xsa369-linux.patch
$

CREDITS
=======

This issue was discovered by Marek Marczykowski-Górecki of Invisible
Things Lab.

For patch:
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

NOTE REGARDING LACK OF EMBARGO
==============================

This was reported publicly multiple times, before the XSA could be
issued.
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--=separator--


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From: John Mok <a9121431@gmail.com>
Date: Wed, 10 Mar 2021 21:27:57 +0800
Message-ID: <CALYzA8EAzX-b2WpHCQ6daOz62n6Jufag-iJUnBsUGM1HVDTRag@mail.gmail.com>
Subject: OVMF Secure Boot on Xen HVM
To: xen-users@lists.xen.org
Content-Type: multipart/alternative; boundary="0000000000005cd45b05bd2ea33b"

--0000000000005cd45b05bd2ea33b
Content-Type: text/plain; charset="UTF-8"

Hi all,

https://wiki.debian.org/SecureBoot/VirtualMachine

Xen 4.15 on Debian Bullseye can use OVMF SecureBoot, like
OVMF_CODE_SecBoot.fd ?

How to make the guest config ?

Thanks a lot.

John Mok

--0000000000005cd45b05bd2ea33b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Hi all,<div dir=3D"auto"><br></div><div dir=3D"auto"><a h=
ref=3D"https://wiki.debian.org/SecureBoot/VirtualMachine">https://wiki.debi=
an.org/SecureBoot/VirtualMachine</a><br></div><div dir=3D"auto"><br></div><=
div dir=3D"auto">Xen 4.15 on Debian Bullseye can use OVMF SecureBoot, like =
OVMF_CODE_SecBoot.fd ?<br></div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">How to make the guest config ?</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">Thanks a lot.</div><div dir=3D"auto"><br></div><div dir=3D"auto">=
John Mok</div></div>

--0000000000005cd45b05bd2ea33b--


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Date: Wed, 10 Mar 2021 13:59:44 +0000
To: xen-announce@lists.xenproject.org
CC: xen-devel@lists.xenproject.org,
    xen-users@lists.xenproject.org
Subject: Xen 4.15 RC2

Xen 4.15 RC2 is now available.

It is available from git:
  git clone https://xenbits.xenproject.org/git-http/xen.git -b 4.15.0-rc2

For your convenience a tarball is available:
  https://downloads.xenproject.org/release/xen/4.15.0-rc2/xen-4.15.0-rc2.tar.gz
  https://downloads.xenproject.org/release/xen/4.15.0-rc2/xen-4.15.0-rc2.tar.gz.sig

Please send bug reports and test reports to
xen-devel@lists.xenproject.org.  When sending bug reports, please CC
relevant maintainers and me (iwj@xenproject.org).

Sorry for the lateness of this RC, which I originally intended to be
available this last Monday.  I hope to resume the schedule with RC3
this coming Monday.

There are still some important fixes and docs changes outstanding.

Ian.


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From: Bertrand Marquis <Bertrand.Marquis@arm.com>
To: Gurrieri Stefano <Stefano.Gurrieri@roj.com>
CC: xen-users <xen-users@lists.xenproject.org>
Subject: Re: HOWTO enable Xen on my board based on STM32MP1
Thread-Topic: HOWTO enable Xen on my board based on STM32MP1
Thread-Index: AdcVj1dWrgn5iepWTpm9UYvkY91w1wAKxEKA
Date: Wed, 10 Mar 2021 14:34:00 +0000
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From: Pry Mar <pryorm09@gmail.com>
Date: Fri, 12 Mar 2021 14:02:12 -0800
Message-ID: <CAHnBbQ_K70LH+i2Q_b0OfXSEmM3EKvUyeU1Ha7wu1yr9-N-aEQ@mail.gmail.com>
Subject: [ANN] new approach to pv domU install of CentOS/AlmaLinux (el8)
To: xen-users <xen-users@lists.xenproject.org>
Content-Type: text/plain; charset="UTF-8"

Hello Xen-users,


Its well known that the kernel/ramdisk pair, found below, normally
supports a pv boot with virt-install from libvirt:
http://mirrors.ocf.berkeley.edu/centos/8/BaseOS/x86_64/os/images/pxeboot/

this is no longer the case with any version of el8 in CentOS and other
RH clones.

I've recently tried a new (MacGyver) style approach to a pv domU boot
explained here:
http://strugglers.net/~andy/blog/2021/02/03/booting-the-centosrhel-installer-under-xen-pvh-mode

Basically, from the pxeboot kernel/ramdisk pair above, you throw away
the kernel, substitute it with the elrepo kernel-ml vmlinuz, then
repack the pxeboot initrd.img with the kernel-ml modules and add a
dracut hook. You don't have to use the elrepo kernel+modules, I've
also used those same bits from Debian Bullseye.

My first test boot.iso from CentOS 8.3, but this is quite slow. When
AlmaLinux came out in Feb with a Minimal ISO this seemed an ideal
platform for testing the repacked initrd.img.

With the Alma minimal ISO total elapsed install time was 600s (10m)
and this included some post-install scripts. My cmdline to kick off
the install:
[    0.000000] Command line: console=hvc0 text
ks=http://192.168.1.3/public_html/alma8-crap-ks.cfg
inst.repo=cdrom:xvdc

// trace of pv install using elrepo repacked initrd.img:
tlviewer@xen1804:~/alma8$ grep -iP 'xen|pv' pv-install-alma8-pt1
tlviewer@c8xen:~/alma8$ sudo xl create -c alma8.cfg
[    0.000000] Xen: [mem 0x0000000000000000-0x000000000009ffff] usable
[    0.000000] Xen: [mem 0x00000000000a0000-0x00000000000fffff] reserved
[    0.000000] Xen: [mem 0x0000000000100000-0x00000000693fffff] usable
[    0.000000] Hypervisor detected: Xen PV
[    0.150910] Kernel/User page tables isolation: disabled on XEN PV.
[    0.535495] Booting paravirtualized kernel on Xen
[    0.535496] Xen version: 4.13.2 (preserve-AD)
[    0.645473] PV qspinlock hash table entries: 256 (order: 0, 4096
bytes, linear)
[    0.670204] xen:events: Using FIFO-based ABI
[    0.670757] clocksource: xen: mask: 0xffffffffffffffff max_cycles:
0x1cd42e4dffb, max_idle_ns: 881590591483 ns
[    0.670771] installing Xen timer for CPU 0
[    0.703547] installing Xen timer for CPU 1
[    0.735310] xen:grant_table: Grant tables using version 1 layout
[    0.736838] PCI: setting up Xen PCI frontend stub
[    1.099920] xen:balloon: Initialising balloon driver
[    1.102385] clocksource: Switched to clocksource xen
[   16.039730] systemd[1]: Detected virtualization xen.
[   19.413874] xen_netfront: Initialising Xen virtual ethernet driver
[   27.563288] systemd[1]: Detected virtualization xen.

Here is a line-by-line trace at my first time getting Anaconda to
start (stopped with simple error):
https://pb.psychotic.ninja/view/raw/f78bd1ef

The future of AlmaLinux looks good if such easy techniques can result
in fast pv installs.
Cheers,
PryMar56
 ##xen-packaging of Freenode


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To: xen-announce@lists.xen.org, xen-devel@lists.xen.org,
 xen-users@lists.xen.org, oss-security@lists.openwall.com
From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 368 v2 - HVM soft-reset crashes toolstack
Message-Id: <E1lMrJv-00073c-GM@xenbits.xenproject.org>
Date: Thu, 18 Mar 2021 12:00:07 +0000

--=separator
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

                    Xen Security Advisory XSA-368
                              version 2

                   HVM soft-reset crashes toolstack

UPDATES IN VERSION 2
====================

Public release.

ISSUE DESCRIPTION
=================

libxl requires all data structures passed across its public interface
to be initialized before use and disposed of afterwards by calling a
specific set of functions.  Many internal data structures also require
this initialize / dispose discipline, but not all of them.

When the "soft reset" feature was implemented, the
libxl__domain_suspend_state structure didn't require any
initialization or disposal.  At some point later, an initialization
function was introduced for the structure; but the "soft reset" path
wasn't refactored to call the initialization function.  When a guest
nwo initiates a "soft reboot", uninitialized data structure leads to
an assert() when later code finds the structure in an unexpected
state.

The effect of this is to crash the process monitoring the guest.  How
this affects the system depends on the structure of the toolstack.

For xl, this will have no security-relevant effect: every VM has its
own independent monitoring process, which contains no state.  The
domain in question will hang in a crashed state, but can be destroyed
by `xl destroy` just like any other non-cooperating domain.

For daemon-based toolstacks linked against libxl, such as libvirt,
this will crash the toolstack, losing the state of any in-progress
operations (localized DoS), and preventing further administrator
operations unless the daemon is configured to restart automatically
(system-wide DoS).  If crashes "leak" resources, then repeated crashes
could use up resources, also causing a system-wide DoS.

IMPACT
======

A malicious guest can crash the management daemon, leading to at least
a localized, possibly system-wide denial-of-service.

VULNERABLE SYSTEMS
==================

Only Xen versions 4.12 through 4.14 are affected.  Earlier versions
are not affected.

The issue affects only systems with a guest monitoring process, which
is linked against libxl, and which is important other than simply for
the functioning of one particular guest.  libvirt is one common
toolstack affected.  Systems using the `xl` command-line tool should
generally suffer no security-relevant effects.

The xapi toolstack does not currently link against libxl, and so is
not affected.

MITIGATION
==========

Ensuring that any management daemons are restarted automatically after
a crash will partially mitigate the issue.

CREDITS
=======

This issue was discovered by Olaf Hering.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

Note that patches for released versions are generally prepared to
apply to the stable branches, and may not apply cleanly to the most
recent release tarball.  Downstreams are encouraged to update to the
tip of the stable branch before applying these patches.

xsa368.patch           xen-unstable
xsa368-4.14.patch      Xen 4.14.x
xsa368-4.13.patch      Xen 4.13.x - Xen 4.12.x

$ sha256sum xsa368*
e80f33c3ce45372fef7bd91ec71b2b66e557176b79f9771872ce111bfff34150  xsa368.meta
b82f2b110514cdf47a2688913ad5af68b01050751d56705a15ddf9a970b6fa0d  xsa368.patch
636df70ae5eaf00b50ef0b5ac219a2aeda771c66833fae88e7ee43b18ae889f4  xsa368-4.13.patch
55bbe59c75b69f493e364dfcf6cdbc7db4acd32dbf0b4d2466815b7c1f1823ce  xsa368-4.14.patch
$

DEPLOYMENT DURING EMBARGO
=========================

Deployment of the patches and/or mitigations described above (or
others which are substantially similar) is permitted during the
embargo, even on public-facing systems with untrusted guest users and
administrators.

But: Distribution of updated software is prohibited (except to other
members of the predisclosure list).

Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
Team.


(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable.  This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)

For more information about permissible uses of embargoed information,
consult the Xen Project community's agreed Security Policy:
  http://www.xenproject.org/security-policy.html
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From xen-users-bounces@lists.xenproject.org Thu Mar 18 13:51:15 2021
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Date: Mon, 15 Mar 2021 12:14:51 +0000
To: xen-announce@lists.xenproject.org
CC: xen-devel@lists.xenproject.org,
    xen-users@lists.xenproject.org
Subject: Xen 4.15 RC3

Xen 4.15 RC3 is now available.

It is available from git:
  git clone https://xenbits.xenproject.org/git-http/xen.git -b 4.15.0-rc3

For your convenience a tarball is available:
  https://downloads.xenproject.org/release/xen/4.15.0-rc3/xen-4.15.0-rc3.tar.gz
  https://downloads.xenproject.org/release/xen/4.15.0-rc3/xen-4.15.0-rc3.tar.gz.sig

Please send bug reports and test reports to
xen-devel@lists.xenproject.org.  When sending bug reports, please CC
relevant maintainers and me (iwj@xenproject.org).

I will send an update on the state of the release in a moment.

Ian.


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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 368 v3 (CVE-2021-28687) - HVM soft-reset
 crashes toolstack
Message-Id: <E1lMt8R-000718-Sb@xenbits.xenproject.org>
Date: Thu, 18 Mar 2021 13:56:23 +0000

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            Xen Security Advisory CVE-2021-28687 / XSA-368
                              version 3

                   HVM soft-reset crashes toolstack

UPDATES IN VERSION 3
====================

CVE assigned.

ISSUE DESCRIPTION
=================

libxl requires all data structures passed across its public interface
to be initialized before use and disposed of afterwards by calling a
specific set of functions.  Many internal data structures also require
this initialize / dispose discipline, but not all of them.

When the "soft reset" feature was implemented, the
libxl__domain_suspend_state structure didn't require any
initialization or disposal.  At some point later, an initialization
function was introduced for the structure; but the "soft reset" path
wasn't refactored to call the initialization function.  When a guest
nwo initiates a "soft reboot", uninitialized data structure leads to
an assert() when later code finds the structure in an unexpected
state.

The effect of this is to crash the process monitoring the guest.  How
this affects the system depends on the structure of the toolstack.

For xl, this will have no security-relevant effect: every VM has its
own independent monitoring process, which contains no state.  The
domain in question will hang in a crashed state, but can be destroyed
by `xl destroy` just like any other non-cooperating domain.

For daemon-based toolstacks linked against libxl, such as libvirt,
this will crash the toolstack, losing the state of any in-progress
operations (localized DoS), and preventing further administrator
operations unless the daemon is configured to restart automatically
(system-wide DoS).  If crashes "leak" resources, then repeated crashes
could use up resources, also causing a system-wide DoS.

IMPACT
======

A malicious guest can crash the management daemon, leading to at least
a localized, possibly system-wide denial-of-service.

VULNERABLE SYSTEMS
==================

Only Xen versions 4.12 through 4.14 are affected.  Earlier versions
are not affected.

The issue affects only systems with a guest monitoring process, which
is linked against libxl, and which is important other than simply for
the functioning of one particular guest.  libvirt is one common
toolstack affected.  Systems using the `xl` command-line tool should
generally suffer no security-relevant effects.

The xapi toolstack does not currently link against libxl, and so is
not affected.

MITIGATION
==========

Ensuring that any management daemons are restarted automatically after
a crash will partially mitigate the issue.

CREDITS
=======

This issue was discovered by Olaf Hering.

RESOLUTION
==========

Applying the appropriate attached patch resolves this issue.

Note that patches for released versions are generally prepared to
apply to the stable branches, and may not apply cleanly to the most
recent release tarball.  Downstreams are encouraged to update to the
tip of the stable branch before applying these patches.

xsa368.patch           xen-unstable
xsa368-4.14.patch      Xen 4.14.x
xsa368-4.13.patch      Xen 4.13.x - Xen 4.12.x

$ sha256sum xsa368*
e80f33c3ce45372fef7bd91ec71b2b66e557176b79f9771872ce111bfff34150  xsa368.meta
b82f2b110514cdf47a2688913ad5af68b01050751d56705a15ddf9a970b6fa0d  xsa368.patch
636df70ae5eaf00b50ef0b5ac219a2aeda771c66833fae88e7ee43b18ae889f4  xsa368-4.13.patch
55bbe59c75b69f493e364dfcf6cdbc7db4acd32dbf0b4d2466815b7c1f1823ce  xsa368-4.14.patch
$

DEPLOYMENT DURING EMBARGO
=========================

Deployment of the patches and/or mitigations described above (or
others which are substantially similar) is permitted during the
embargo, even on public-facing systems with untrusted guest users and
administrators.

But: Distribution of updated software is prohibited (except to other
members of the predisclosure list).

Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
Team.


(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable.  This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)

For more information about permissible uses of embargoed information,
consult the Xen Project community's agreed Security Policy:
  http://www.xenproject.org/security-policy.html
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    xen-users@lists.xenproject.org
Subject: Xen 4.15 RC4

From: Ian Jackson <iwj@xenproject.org>
Date: Mon, 15 Mar 2021 12:14:51 +0000

Xen 4.15 RC4 is now available.

It is available from git:
  git clone https://xenbits.xenproject.org/git-http/xen.git -b 4.15.0-rc4

For your convenience a tarball is available:
  https://downloads.xenproject.org/release/xen/4.15.0-rc4/xen-4.15.0-rc4.tar.gz
  https://downloads.xenproject.org/release/xen/4.15.0-rc4/xen-4.15.0-rc4.tar.gz.sig

Please send bug reports and test reports to
xen-devel@lists.xenproject.org.  When sending bug reports, please CC
relevant maintainers and me (iwj@xenproject.org).

I will send an update on the state of the release fairly soon.

Ian.



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From: Rajagopal Aravindan <a.rajagopal.81@gmail.com>
Date: Fri, 26 Mar 2021 23:41:48 +0530
Message-ID: <CAEQQSVstbZAnOBc2zaexSNu8kzfA7ZUp_ArM8_F2_=KAJW+FHQ@mail.gmail.com>
Subject: Xen - i.MX8QM vs i.MX8MQ
To: xen-users@lists.xenproject.org
Content-Type: multipart/alternative; boundary="00000000000043dca305be747999"

--00000000000043dca305be747999
Content-Type: text/plain; charset="UTF-8"

Hello All,

Greetings !

I came across a few links saying Xen is supported on NXP's i.MX8QM.
But, I don't see any such thing for i.MX8MQ and people only talking about
jailhouse hypervisor for MQ. [1]

Can someone here clarify whether i.MX8MQ h/w is NOT compatible with Xen or
the required piece of s/w is yet to be upstreamed to Xen ?

Thanks,
Rajagopal

[1] -
https://community.nxp.com/t5/i-MX-Processors/IMX8-XEN-SUPPORT/m-p/841703

--00000000000043dca305be747999
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hello All,<div><br></div><div>Greetings !</div><div><br></=
div><div>I came across a few links saying Xen is supported on NXP&#39;s i.M=
X8QM.</div><div>But, I don&#39;t see any such thing for i.MX8MQ and people =
only talking about jailhouse hypervisor for MQ. [1]</div><div><br></div><di=
v>Can someone here clarify whether i.MX8MQ h/w is NOT compatible with Xen o=
r the required piece of s/w is yet to be upstreamed to Xen ?</div><div><br>=
</div><div>Thanks,</div><div>Rajagopal</div><div><br></div><div>[1] -=C2=A0=
<a href=3D"https://community.nxp.com/t5/i-MX-Processors/IMX8-XEN-SUPPORT/m-=
p/841703">https://community.nxp.com/t5/i-MX-Processors/IMX8-XEN-SUPPORT/m-p=
/841703</a></div></div>

--00000000000043dca305be747999--


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Subject: Re: Xen - i.MX8QM vs i.MX8MQ
To: Rajagopal Aravindan <a.rajagopal.81@gmail.com>,
 xen-users@lists.xenproject.org, Peng Fan <peng.fan@nxp.com>
References: <CAEQQSVstbZAnOBc2zaexSNu8kzfA7ZUp_ArM8_F2_=KAJW+FHQ@mail.gmail.com>
From: Julien Grall <julien@xen.org>
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(+ Peng)

On 26/03/2021 18:11, Rajagopal Aravindan wrote:
> Hello All,

Hi,

> Greetings !
> 
> I came across a few links saying Xen is supported on NXP's i.MX8QM.
> But, I don't see any such thing for i.MX8MQ and people only talking 
> about jailhouse hypervisor for MQ. [1]
> 
> Can someone here clarify whether i.MX8MQ h/w is NOT compatible with Xen 
> or the required piece of s/w is yet to be upstreamed to Xen ?

I have seen users that are successfuly booting Xen on i.MX8, although 
they are not directly using Xen Project tree but one provided by code 
aurora NXP (see [1]).

AFAIK, there might be some missing pieces in the Xen Project tree for 
that board. I am not sure whether this is just to take full of advantage 
of board.

I have CCed Peng who might be able to provide support.

Cheers,

[1] https://source.codeaurora.org/external/imx/imx-xen/

-- 
Julien Grall


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From: "yinhua_chen@outlook.com" <yinhua_chen@outlook.com>
To: "xen-users@lists.xenproject.org" <xen-users@lists.xenproject.org>
Subject: ARMv8-A Xen runs on FVP/fastmodels
Thread-Topic: ARMv8-A Xen runs on FVP/fastmodels
Thread-Index: AQHXJDmKrwPd3eiDnEyPjRTIENGm+g==
Date: Mon, 29 Mar 2021 01:53:22 +0000
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--_000_OSYPR01MB5431BC16DBD7C3F68047E6D2817E9OSYPR01MB5431jpnp_
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Hi all,

I am interested in Xen-on-ARM, and I want to test and modify Xen on ARM pla=
tform. For debug purpose, I prefer using simulators.

I do not want to use QEMU because some other softwares I am using does not =
support running on QEMU.

However, I cannot find any Xen-on-FVP blogs or documents published in recen=
t three years, and I met many problems when trying to run Xen on FVP/fast m=
odels according to the old blogs/documents.

If there is anyone who can help me, I appreciate for your help.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DThe following i=
s the effort I made=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There are two blogs/documents I refer to:

1. (2015)How to boot Xen on FVP(fast) model using UEFI. https://wiki-archiv=
e.linaro.org/LEG/Engineering/Xen_boot_on_FVP_UEFI

I follow this blog, and reset UEFI-tools, linaro-edk2 to 2015 version, use =
Linaro-GCC4.8. Error comes out when running the script "tool-build-v8-fvp.s=
h<https://wiki-archive.linaro.org/LEG/Engineering/Xen_boot_on_FVP_UEFI?acti=
on=3DAttachFile&do=3Dupload_form&ticket=3D0060612dbc.fd8d92425699a7d5621e71=
c63ef8308216153ca5&target=3D+tool-build-v8-fvp.sh>".

And I cannot use 2015-version-ATF, since I need the new features of 2019-ve=
rsion-ATF.

If anyone needs to see the error message, I will reproduce the error messag=
e. I need to spend some time to reproduce the error.

2. (2020 Oct 13)Xen ARM with Virtualization Extension.
https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions#Bui=
lding_Xen_on_ARM

I follow "Building Xen on ARM" instructions:

2-1. I clone Xen from https://xenbits.xen.org/git-http/xen.git
2-2. I compile Xen by (with Linaro-GCC7.5)

make dist-xen XEN_TARGET_ARCH=3Darm64 CROSS_COMPILE=3Daarch64-linux-gnu-

2-3. About the toolstack, I follow this wiki Xen_on_ARM_and_Yocto<https://w=
iki.xenproject.org/wiki/Xen_on_ARM_and_Yocto>.
        The Xen-image-on-QEMU part seems works fine. However, I cannot find=
 anything about "FVP/fastmodels" in the conf/local.conf file
        I try to build Xen-image-on-FVP by referencing the Xen-image-on-ras=
pberrypi part in this wiki.
        However, I cannot find any "FVP/fastmodels" branch in yocto reposit=
ory.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

If there is anyone who can help me build Xen on FVP/fastmodels, I appreciat=
e for your help.

Sincerely,
Yinhua


--_000_OSYPR01MB5431BC16DBD7C3F68047E6D2817E9OSYPR01MB5431jpnp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Hi all,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
I am interested in Xen-on-ARM, and I want to test and modify Xen on ARM pla=
tform. For debug purpose, I prefer using simulators.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
I do not want to use QEMU because some other softwares I am using does not =
support running on QEMU.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
However, I cannot find any Xen-on-FVP blogs or documents published in recen=
t three years, and I met many problems when trying to run Xen on FVP/fast m=
odels according to the old blogs/documents.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
If there is anyone who can help me, I appreciate for your help.</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3DThe following i=
s the effort I made=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
There are two blogs/documents I refer to:</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<div><span>1. (2015)How to boot Xen on FVP(fast) model using UEFI.&nbsp;<a =
href=3D"https://wiki-archive.linaro.org/LEG/Engineering/Xen_boot_on_FVP_UEF=
I" id=3D"LPlnk670408">https://wiki-archive.linaro.org/LEG/Engineering/Xen_b=
oot_on_FVP_UEFI</a></span></div>
<div><br>
</div>
<div>I follow this blog, and reset UEFI-tools, linaro-edk2 to 2015 version,=
 use Linaro-GCC4.8. Error comes out when running the script &quot;<a class=
=3D"attachment nonexistent" href=3D"https://wiki-archive.linaro.org/LEG/Eng=
ineering/Xen_boot_on_FVP_UEFI?action=3DAttachFile&amp;do=3Dupload_form&amp;=
ticket=3D0060612dbc.fd8d92425699a7d5621e71c63ef8308216153ca5&amp;target=3D+=
tool-build-v8-fvp.sh" title=3D"&#19978;&#36733;&#26032;&#38468;&#20214;&quo=
t; tool-build-v8-fvp.sh&quot;" style=3D"outline:none;color:rgb(108, 157, 16=
);font-family:Ubuntu, sans-serif;font-size:13px;background-color:rgb(255, 2=
55, 255)" id=3D"LPlnk277173">tool-build-v8-fvp.sh</a>&quot;.</div>
<div><br>
</div>
<div>And I cannot use 2015-version-ATF, since I need the new features of 20=
19-version-ATF.</div>
<div><br>
</div>
<div>If anyone needs to see the error message, I will reproduce the error m=
essage. I need to spend some time to reproduce the error.</div>
<div><span style=3D"background-color:rgb(255, 255, 255);display:inline !imp=
ortant"><br>
</span></div>
<div><span style=3D"background-color:rgb(255, 255, 255);display:inline !imp=
ortant">2. (2020 Oct 13)Xen ARM with Virtualization Extension.&nbsp;</span>=
</div>
<div><span style=3D"background-color:rgb(255, 255, 255);display:inline !imp=
ortant"><a href=3D"https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualiza=
tion_Extensions#Building_Xen_on_ARM" id=3D"LPlnk933933">https://wiki.xenpro=
ject.org/wiki/Xen_ARM_with_Virtualization_Extensions#Building_Xen_on_ARM</a=
></span></div>
<div><br>
</div>
<div>I follow &quot;Building Xen on ARM&quot; instructions:</div>
<div><br>
</div>
<div>2-1. I clone Xen from&nbsp;<a href=3D"https://xenbits.xen.org/git-http=
/xen.git" id=3D"LPlnk375034">https://xenbits.xen.org/git-http/xen.git</a><b=
r>
</div>
<div>2-2. I compile Xen by (with Linaro-GCC7.5)
<pre style=3D"font-family:monospace, monospace;background-color:rgb(248, 24=
9, 250);border:1px solid rgb(234, 236, 240);padding:1em;line-height:1.3em;f=
ont-size:12.7px">make dist-xen XEN_TARGET_ARCH=3Darm64 CROSS_COMPILE=3Daarc=
h64-linux-gnu-</pre>
</div>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
2-3. About the toolstack, I follow this wiki&nbsp;<a href=3D"https://wiki.x=
enproject.org/wiki/Xen_on_ARM_and_Yocto" title=3D"Xen on ARM and Yocto" sty=
le=3D"color:rgb(0, 43, 184);background:none rgb(255, 255, 255);font-family:=
sans-serif;font-size:12.7px">Xen_on_ARM_and_Yocto</a><span style=3D"font-fa=
mily:sans-serif;font-size:12.7px;background-color:rgb(255, 255, 255);displa=
y:inline !important">.</span></div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<span style=3D"font-family:sans-serif;font-size:12.7px;background-color:rgb=
(255, 255, 255);display:inline !important">&nbsp; &nbsp; &nbsp; &nbsp; The =
Xen-image-on-QEMU part seems works fine. However, I cannot find anything ab=
out &quot;FVP/fastmodels&quot; in the&nbsp;<b style=3D"background-color:rgb=
(255, 255, 255)">conf/local.conf
</b><span style=3D"background-color:rgb(255, 255, 255)">file</span></span><=
/div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<span style=3D"font-family:sans-serif;font-size:12.7px;background-color:rgb=
(255, 255, 255);display:inline !important"><span style=3D"background-color:=
rgb(255, 255, 255)">&nbsp; &nbsp; &nbsp; &nbsp; I try to build Xen-image-on=
-FVP by referencing the Xen-image-on-raspberrypi part in
 this wiki.</span></span></div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<span style=3D"font-family:sans-serif;font-size:12.7px;background-color:rgb=
(255, 255, 255);display:inline !important"><span style=3D"background-color:=
rgb(255, 255, 255)">&nbsp; &nbsp; &nbsp; &nbsp; However, I cannot find any =
&quot;FVP/fastmodels&quot; branch in yocto repository.</span></span></div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<span style=3D"background-color:rgb(255, 255, 255);display:inline !importan=
t">If there is anyone who can help me build Xen on FVP/fastmodels, I apprec=
iate for your help.</span><br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Sincerely,</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
Yinhua</div>
<div style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
</body>
</html>

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From: Peng Fan <peng.fan@nxp.com>
To: Julien Grall <julien@xen.org>, Rajagopal Aravindan
	<a.rajagopal.81@gmail.com>, "xen-users@lists.xenproject.org"
	<xen-users@lists.xenproject.org>
Subject: RE: Xen - i.MX8QM vs i.MX8MQ
Thread-Topic: Xen - i.MX8QM vs i.MX8MQ
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> Subject: Re: Xen - i.MX8QM vs i.MX8MQ
>=20
> (+ Peng)

Thanks for adding me.

>=20
> On 26/03/2021 18:11, Rajagopal Aravindan wrote:
> > Hello All,
>=20
> Hi,
>=20
> > Greetings !
> >
> > I came across a few links saying Xen is supported on NXP's i.MX8QM.
> > But, I don't see any such thing for i.MX8MQ and people only talking
> > about jailhouse hypervisor for MQ. [1]
> >
> > Can someone here clarify whether i.MX8MQ h/w is NOT compatible with
> > Xen or the required piece of s/w is yet to be upstreamed to Xen ?

i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this
chip.

There were people trying to upstream this SoC in community, you should
be able to find patches for 8MQ or 8MM.

We not see customers requesting xen for i.MX8M*, not sure your usecases.

Regards,
Peng.

>=20
> I have seen users that are successfuly booting Xen on i.MX8, although the=
y are
> not directly using Xen Project tree but one provided by code aurora NXP (=
see
> [1]).
>=20
> AFAIK, there might be some missing pieces in the Xen Project tree for tha=
t
> board. I am not sure whether this is just to take full of advantage of bo=
ard.
>=20
> I have CCed Peng who might be able to provide support.
>=20
> Cheers,
>=20
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsourc=
e
> .codeaurora.org%2Fexternal%2Fimx%2Fimx-xen%2F&amp;data=3D04%7C01%7
> Cpeng.fan%40nxp.com%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1
> d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn
> known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
> k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D7dIXYtfNCOAGNEsVMayTa
> 5ddXkCwewnkLVUMjg4wVt8%3D&amp;reserved=3D0
>=20
> --
> Julien Grall


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From: Rajagopal Aravindan <a.rajagopal.81@gmail.com>
Date: Mon, 29 Mar 2021 13:30:21 +0530
Message-ID: <CAEQQSVvLeqB3twrV3khinbwxYsM4Oc8eU4AYswTgPTZaQaz-Ag@mail.gmail.com>
Subject: Re: Xen - i.MX8QM vs i.MX8MQ
To: Peng Fan <peng.fan@nxp.com>
Cc: Julien Grall <julien@xen.org>, 
	"xen-users@lists.xenproject.org" <xen-users@lists.xenproject.org>
Content-Type: multipart/alternative; boundary="0000000000002deab905bea84889"

--0000000000002deab905bea84889
Content-Type: text/plain; charset="UTF-8"

Hello Peng,

Thank you for your response.

>>There were people trying to upstream this SoC in community, you should be
able to find patches for 8MQ or 8MM.
Will take a look at Xen repo hosted by both LinuxFoundation as well as
CodeAurora  and get back.

>>i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this
chip.
Thanks for highlighting this and at this point in time, I see

   1. performance suffering because of this and
   2. drivers may need to be modified, to arbitrate access to main memory,
   between themselves which otherwise SMMU would have taken care of
   3. also, drivers need to ensure that they get ONLY those regions in the
   accessible range to the peripherals

Can you please provide more insight on what the lack of SMMU means to Xen,
other than the above ?

>> We not see customers requesting xen for i.MX8M*, not sure your usecases.
I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence was
interested in trying Xen on the MQ board.
Mine is the normal use case of running a Ubuntu + Android on top of Xen,
and then running applications inside them.


Regards,
Rajagopal

On Mon, Mar 29, 2021 at 8:39 AM Peng Fan <peng.fan@nxp.com> wrote:

> > Subject: Re: Xen - i.MX8QM vs i.MX8MQ
> >
> > (+ Peng)
>
> Thanks for adding me.
>
> >
> > On 26/03/2021 18:11, Rajagopal Aravindan wrote:
> > > Hello All,
> >
> > Hi,
> >
> > > Greetings !
> > >
> > > I came across a few links saying Xen is supported on NXP's i.MX8QM.
> > > But, I don't see any such thing for i.MX8MQ and people only talking
> > > about jailhouse hypervisor for MQ. [1]
> > >
> > > Can someone here clarify whether i.MX8MQ h/w is NOT compatible with
> > > Xen or the required piece of s/w is yet to be upstreamed to Xen ?
>
> i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this
> chip.
>
> There were people trying to upstream this SoC in community, you should
> be able to find patches for 8MQ or 8MM.
>
> We not see customers requesting xen for i.MX8M*, not sure your usecases.
>
> Regards,
> Peng.
>
> >
> > I have seen users that are successfuly booting Xen on i.MX8, although
> they are
> > not directly using Xen Project tree but one provided by code aurora NXP
> (see
> > [1]).
> >
> > AFAIK, there might be some missing pieces in the Xen Project tree for
> that
> > board. I am not sure whether this is just to take full of advantage of
> board.
> >
> > I have CCed Peng who might be able to provide support.
> >
> > Cheers,
> >
> > [1]
> > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsource
> > .codeaurora.org%2Fexternal%2Fimx%2Fimx-xen%2F&amp;data=04%7C01%7
> > Cpeng.fan%40nxp.com%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1
> > d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn
> > known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
> > k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=7dIXYtfNCOAGNEsVMayTa
> > 5ddXkCwewnkLVUMjg4wVt8%3D&amp;reserved=0
> >
> > --
> > Julien Grall
>

--0000000000002deab905bea84889
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Hello Peng,<div><br></div><div>Thank you =
for your response.</div><div><br></div><div>&gt;&gt;There were people tryin=
g to upstream this SoC in community, you should be able to find patches for=
 8MQ or 8MM.</div><div>Will take a look at Xen repo hosted by both LinuxFou=
ndation as well as CodeAurora=C2=A0 and get back.</div><div><br></div><div>=
&gt;&gt;i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in=
 this chip.=C2=A0=C2=A0</div><div>Thanks for=C2=A0highlighting this and at =
this=C2=A0point in time, I see</div><div><ol><li>performance suffering beca=
use of this and</li><li>drivers may need to be modified, to arbitrate acces=
s to main memory, between themselves which otherwise SMMU would have taken =
care of</li><li>also, drivers need to ensure that they get ONLY those regio=
ns in the accessible range to the peripherals</li></ol></div><div>Can you p=
lease provide more insight on what the lack of SMMU means to Xen, other tha=
n the above ?</div><div><br></div><div>&gt;&gt;

We not see customers requesting xen for i.MX8M*, not sure your usecases.

</div><div>

I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence was i=
nterested in trying Xen on the MQ board.=C2=A0</div><div>Mine is the normal=
 use case of running a Ubuntu=C2=A0+ Android on top of Xen, and then runnin=
g applications inside them.</div><div><br></div><div></div></div><div dir=
=3D"ltr">=C2=A0=C2=A0<div>Regards,</div><div>Rajagopal</div></div><br><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Mar 29,=
 2021 at 8:39 AM Peng Fan &lt;<a href=3D"mailto:peng.fan@nxp.com">peng.fan@=
nxp.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex">&gt; Subject: Re: Xen - i.MX8QM vs i.MX8MQ<br>
&gt; <br>
&gt; (+ Peng)<br>
<br>
Thanks for adding me.<br>
<br>
&gt; <br>
&gt; On 26/03/2021 18:11, Rajagopal Aravindan wrote:<br>
&gt; &gt; Hello All,<br>
&gt; <br>
&gt; Hi,<br>
&gt; <br>
&gt; &gt; Greetings !<br>
&gt; &gt;<br>
&gt; &gt; I came across a few links saying Xen is supported on NXP&#39;s i.=
MX8QM.<br>
&gt; &gt; But, I don&#39;t see any such thing for i.MX8MQ and people only t=
alking<br>
&gt; &gt; about jailhouse hypervisor for MQ. [1]<br>
&gt; &gt;<br>
&gt; &gt; Can someone here clarify whether i.MX8MQ h/w is NOT compatible wi=
th<br>
&gt; &gt; Xen or the required piece of s/w is yet to be upstreamed to Xen ?=
<br>
<br>
i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this<br=
>
chip.<br>
<br>
There were people trying to upstream this SoC in community, you should<br>
be able to find patches for 8MQ or 8MM.<br>
<br>
We not see customers requesting xen for i.MX8M*, not sure your usecases.<br=
>
<br>
Regards,<br>
Peng.<br>
<br>
&gt; <br>
&gt; I have seen users that are successfuly booting Xen on i.MX8, although =
they are<br>
&gt; not directly using Xen Project tree but one provided by code aurora NX=
P (see<br>
&gt; [1]).<br>
&gt; <br>
&gt; AFAIK, there might be some missing pieces in the Xen Project tree for =
that<br>
&gt; board. I am not sure whether this is just to take full of advantage of=
 board.<br>
&gt; <br>
&gt; I have CCed Peng who might be able to provide support.<br>
&gt; <br>
&gt; Cheers,<br>
&gt; <br>
&gt; [1]<br>
&gt; <a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps=
%3A%2F%2Fsource" rel=3D"noreferrer" target=3D"_blank">https://eur01.safelin=
ks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsource</a><br>
&gt; .<a href=3D"http://codeaurora.org" rel=3D"noreferrer" target=3D"_blank=
">codeaurora.org</a>%2Fexternal%2Fimx%2Fimx-xen%2F&amp;amp;data=3D04%7C01%7=
<br>
&gt; Cpeng.fan%<a href=3D"http://40nxp.com" rel=3D"noreferrer" target=3D"_b=
lank">40nxp.com</a>%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1<br>
&gt; d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn<br>
&gt; known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I<br>
&gt; k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;amp;sdata=3D7dIXYtfNCOAGNEsVMayTa<br>
&gt; 5ddXkCwewnkLVUMjg4wVt8%3D&amp;amp;reserved=3D0<br>
&gt; <br>
&gt; --<br>
&gt; Julien Grall<br>
</blockquote></div></div>

--0000000000002deab905bea84889--


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From: Peng Fan <van.freenix@gmail.com>
Date: Mon, 29 Mar 2021 18:08:22 +0800
Message-ID: <CAEfxd-_f5o4L59=npojxaobgFcyAVO3sBhBL=64wbV3gi8=8=g@mail.gmail.com>
Subject: Re: Xen - i.MX8QM vs i.MX8MQ
To: Rajagopal Aravindan <a.rajagopal.81@gmail.com>
Cc: Peng Fan <peng.fan@nxp.com>, Julien Grall <julien@xen.org>, 
	"xen-users@lists.xenproject.org" <xen-users@lists.xenproject.org>
Content-Type: multipart/alternative; boundary="00000000000077d91505beaa1024"

--00000000000077d91505beaa1024
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

Sorry for HTML format. Inline.

Rajagopal Aravindan <a.rajagopal.81@gmail.com> =E4=BA=8E2021=E5=B9=B43=E6=
=9C=8829=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5=8D=884:01=E5=86=99=E9=81=
=93=EF=BC=9A

> Hello Peng,
>
> Thank you for your response.
>
> >>There were people trying to upstream this SoC in community, you should
> be able to find patches for 8MQ or 8MM.
> Will take a look at Xen repo hosted by both LinuxFoundation as well as
> CodeAurora  and get back.
>
> >>i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in thi=
s
> chip.
> Thanks for highlighting this and at this point in time, I see
>
>    1. performance suffering because of this and
>    2. drivers may need to be modified, to arbitrate access to main
>    memory, between themselves which otherwise SMMU would have taken care =
of
>    3. also, drivers need to ensure that they get ONLY those regions in
>    the accessible range to the peripherals
>
> Can you please provide more insight on what the lack of SMMU means to Xen=
,
> other than the above ?
>

Without SMMU, you could not do device passthrough.


>
> >> We not see customers requesting xen for i.MX8M*, not sure your
> usecases.
> I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence was
> interested in trying Xen on the MQ board.
> Mine is the normal use case of running a Ubuntu + Android on top of Xen,
> and then running applications inside them.
>

It will be a bit hard to achieve this. No SMMU, only one GPU.

Regards,
Peng.


>
>
> Regards,
> Rajagopal
>
> On Mon, Mar 29, 2021 at 8:39 AM Peng Fan <peng.fan@nxp.com> wrote:
>
>> > Subject: Re: Xen - i.MX8QM vs i.MX8MQ
>> >
>> > (+ Peng)
>>
>> Thanks for adding me.
>>
>> >
>> > On 26/03/2021 18:11, Rajagopal Aravindan wrote:
>> > > Hello All,
>> >
>> > Hi,
>> >
>> > > Greetings !
>> > >
>> > > I came across a few links saying Xen is supported on NXP's i.MX8QM.
>> > > But, I don't see any such thing for i.MX8MQ and people only talking
>> > > about jailhouse hypervisor for MQ. [1]
>> > >
>> > > Can someone here clarify whether i.MX8MQ h/w is NOT compatible with
>> > > Xen or the required piece of s/w is yet to be upstreamed to Xen ?
>>
>> i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this
>> chip.
>>
>> There were people trying to upstream this SoC in community, you should
>> be able to find patches for 8MQ or 8MM.
>>
>> We not see customers requesting xen for i.MX8M*, not sure your usecases.
>>
>> Regards,
>> Peng.
>>
>> >
>> > I have seen users that are successfuly booting Xen on i.MX8, although
>> they are
>> > not directly using Xen Project tree but one provided by code aurora NX=
P
>> (see
>> > [1]).
>> >
>> > AFAIK, there might be some missing pieces in the Xen Project tree for
>> that
>> > board. I am not sure whether this is just to take full of advantage of
>> board.
>> >
>> > I have CCed Peng who might be able to provide support.
>> >
>> > Cheers,
>> >
>> > [1]
>> >
>> https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsour=
ce
>> > .codeaurora.org%2Fexternal%2Fimx%2Fimx-xen%2F&amp;data=3D04%7C01%7
>> > Cpeng.fan%40nxp.com%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1
>> > d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn
>> > known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
>> > k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D7dIXYtfNCOAGNEsVMayTa
>> > 5ddXkCwewnkLVUMjg4wVt8%3D&amp;reserved=3D0
>> >
>> > --
>> > Julien Grall
>>
>

--

--00000000000077d91505beaa1024
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Sorry for HTML format. Inline.</div><br><div class=3D=
"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">Rajagopal Aravindan &lt=
;<a href=3D"mailto:a.rajagopal.81@gmail.com">a.rajagopal.81@gmail.com</a>&g=
t; =E4=BA=8E2021=E5=B9=B43=E6=9C=8829=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=
=E5=8D=884:01=E5=86=99=E9=81=93=EF=BC=9A<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Hello Peng,<div>=
<br></div><div>Thank you for your response.</div><div><br></div><div>&gt;&g=
t;There were people trying to upstream this SoC in community, you should be=
 able to find patches for 8MQ or 8MM.</div><div>Will take a look at Xen rep=
o hosted by both LinuxFoundation as well as CodeAurora=C2=A0 and get back.<=
/div><div><br></div><div>&gt;&gt;i.MX8MQ could use XEN hypervisor, but note=
 that there is no SMMU in this chip.=C2=A0=C2=A0</div><div>Thanks for=C2=A0=
highlighting this and at this=C2=A0point in time, I see</div><div><ol><li>p=
erformance suffering because of this and</li><li>drivers may need to be mod=
ified, to arbitrate access to main memory, between themselves which otherwi=
se SMMU would have taken care of</li><li>also, drivers need to ensure that =
they get ONLY those regions in the accessible range to the peripherals</li>=
</ol></div><div>Can you please provide more insight on what the lack of SMM=
U means to Xen, other than the above ?</div></div></div></blockquote><div><=
br></div><div>Without SMMU, you could not do device passthrough.</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr"><div dir=3D"ltr"><div><br></div><div>&gt;&gt;

We not see customers requesting xen for i.MX8M*, not sure your usecases.

</div><div>

I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence was i=
nterested in trying Xen on the MQ board.=C2=A0</div><div>Mine is the normal=
 use case of running a Ubuntu=C2=A0+ Android on top of Xen, and then runnin=
g applications inside them.</div></div></div></blockquote><div><br></div><d=
iv>It will be a bit hard to achieve this. No SMMU, only one GPU.</div><div>=
<br></div><div>Regards,</div><div>Peng.</div><div>=C2=A0</div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div=
><br></div><div></div></div><div dir=3D"ltr">=C2=A0=C2=A0<div>Regards,</div=
><div>Rajagopal</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, Mar 29, 2021 at 8:39 AM Peng Fan &lt;<a href=
=3D"mailto:peng.fan@nxp.com" target=3D"_blank">peng.fan@nxp.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">&gt; Subject=
: Re: Xen - i.MX8QM vs i.MX8MQ<br>
&gt; <br>
&gt; (+ Peng)<br>
<br>
Thanks for adding me.<br>
<br>
&gt; <br>
&gt; On 26/03/2021 18:11, Rajagopal Aravindan wrote:<br>
&gt; &gt; Hello All,<br>
&gt; <br>
&gt; Hi,<br>
&gt; <br>
&gt; &gt; Greetings !<br>
&gt; &gt;<br>
&gt; &gt; I came across a few links saying Xen is supported on NXP&#39;s i.=
MX8QM.<br>
&gt; &gt; But, I don&#39;t see any such thing for i.MX8MQ and people only t=
alking<br>
&gt; &gt; about jailhouse hypervisor for MQ. [1]<br>
&gt; &gt;<br>
&gt; &gt; Can someone here clarify whether i.MX8MQ h/w is NOT compatible wi=
th<br>
&gt; &gt; Xen or the required piece of s/w is yet to be upstreamed to Xen ?=
<br>
<br>
i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this<br=
>
chip.<br>
<br>
There were people trying to upstream this SoC in community, you should<br>
be able to find patches for 8MQ or 8MM.<br>
<br>
We not see customers requesting xen for i.MX8M*, not sure your usecases.<br=
>
<br>
Regards,<br>
Peng.<br>
<br>
&gt; <br>
&gt; I have seen users that are successfuly booting Xen on i.MX8, although =
they are<br>
&gt; not directly using Xen Project tree but one provided by code aurora NX=
P (see<br>
&gt; [1]).<br>
&gt; <br>
&gt; AFAIK, there might be some missing pieces in the Xen Project tree for =
that<br>
&gt; board. I am not sure whether this is just to take full of advantage of=
 board.<br>
&gt; <br>
&gt; I have CCed Peng who might be able to provide support.<br>
&gt; <br>
&gt; Cheers,<br>
&gt; <br>
&gt; [1]<br>
&gt; <a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps=
%3A%2F%2Fsource" rel=3D"noreferrer" target=3D"_blank">https://eur01.safelin=
ks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsource</a><br>
&gt; .<a href=3D"http://codeaurora.org" rel=3D"noreferrer" target=3D"_blank=
">codeaurora.org</a>%2Fexternal%2Fimx%2Fimx-xen%2F&amp;amp;data=3D04%7C01%7=
<br>
&gt; Cpeng.fan%<a href=3D"http://40nxp.com" rel=3D"noreferrer" target=3D"_b=
lank">40nxp.com</a>%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1<br>
&gt; d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn<br>
&gt; known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I<br>
&gt; k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;amp;sdata=3D7dIXYtfNCOAGNEsVMayTa<br>
&gt; 5ddXkCwewnkLVUMjg4wVt8%3D&amp;amp;reserved=3D0<br>
&gt; <br>
&gt; --<br>
&gt; Julien Grall<br>
</blockquote></div></div>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
 class=3D"gmail_signature"><div dir=3D"ltr"><br></div></div></div>

--00000000000077d91505beaa1024--


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Date: Mon, 29 Mar 2021 15:10:18 +0100
To: xen-announce@lists.xenproject.org
CC: xen-devel@lists.xenproject.org,
    xen-users@lists.xenproject.org
Subject: Xen 4.15 RC5

Xen 4.15 RC5 is now available.

It is available from git:
  git clone https://xenbits.xenproject.org/git-http/xen.git -b 4.15.0-rc5

For your convenience a tarball is available:
  https://downloads.xenproject.org/release/xen/4.15.0-rc5/xen-4.15.0-rc5.tar.gz
  https://downloads.xenproject.org/release/xen/4.15.0-rc5/xen-4.15.0-rc5.tar.gz.sig

Please send bug reports and test reports to
xen-devel@lists.xenproject.org.  When sending bug reports, please CC
relevant maintainers and me (iwj@xenproject.org).

I am hoping that this will be the last RC.  Please send any reports
of serious bugs (or brown paper bag mistakes) quickly, or we may have
to release without the fix.

Thanks,
Ian.



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From: Xen.org security team <security@xen.org>
CC: Xen.org security team <security-team-members@xen.org>
Subject: Xen Security Advisory 371 v3 (CVE-2021-28688) - Linux: blkback
 driver may leak persistent grants
Message-Id: <E1lRD3z-0005Dv-Rd@xenbits.xenproject.org>
Date: Tue, 30 Mar 2021 12:01:39 +0000

--=separator
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

            Xen Security Advisory CVE-2021-28688 / XSA-371
                               version 3

           Linux: blkback driver may leak persistent grants

UPDATES IN VERSION 3
====================

Public release.

ISSUE DESCRIPTION
=================

The fix for XSA-365 includes initialization of pointers such that
subsequent cleanup code wouldn't use uninitialized or stale values.
This initialization went too far and may under certain conditions also
overwrite pointers which are in need of cleaning up.  The lack of
cleanup would result in leaking persistent grants.  The leak in turn
would prevent fully cleaning up after a respective guest has died,
leaving around zombie domains.

IMPACT
======

A malicious or buggy frontend driver may be able to cause resource leaks
from the corresponding backend driver.  This can result in a host-wide
Denial of Sevice (DoS).

VULNERABLE SYSTEMS
==================

All Linux versions having the fix for XSA-365 applied are vulnerable.
XSA-365 was classified to affect versions back to at least 3.11.

MITIGATION
==========

Reconfiguring guests to use alternative (e.g. qemu-based) backends may
avoid the vulnerability.

Avoiding the use of persistent grants will also avoid the vulnerability.
This can be achieved by passing the "feature_persistent=0" module option
to the xen-blkback driver.

CREDITS
=======

This issue was discovered by Nicolai Stange of SUSE.

RESOLUTION
==========

Applying the attached patch resolves this issue.

xsa371-linux.patch           Linux 5.12-rc, 5.11.1 onwards, 5.10.18 onwards
<not directly affected>      Linux 5.10.0 - 5.10.17, 5.11.0
<applicability unknown>      Linux 4.4 - 5.9
<no fix available>           Linux 3.11 - 4.3

$ sha256sum xsa371*
1b2472253aa82385b3eff280fa4adf52742f06813fc093f5f86cd4a3021f736c  xsa371-linux.patch
$

DEPLOYMENT DURING EMBARGO
=========================

Deployment of the patches described above (or others which are
substantially similar) is permitted during the embargo, even on
public-facing systems with untrusted guest users and administrators.

HOWEVER, deployment of the mitigations described above is NOT permitted
during the embargo on public-facing systems with untrusted guest users
and administrators.  This is because such configuration changes may be
recognizable by the affected guests.

AND: Distribution of updated software is prohibited (except to other
members of the predisclosure list).

Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
Team.

(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable.  This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)

For more information about permissible uses of embargoed information,
consult the Xen Project community's agreed Security Policy:
  http://www.xenproject.org/security-policy.html
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From: Rajagopal Aravindan <a.rajagopal.81@gmail.com>
Date: Tue, 30 Mar 2021 20:51:27 +0530
Message-ID: <CAEQQSVsmv5h16aB94xGoaRncwBYfoF6yj5693+ySbegeUy7-UA@mail.gmail.com>
Subject: Re: Xen - i.MX8QM vs i.MX8MQ
To: Peng Fan <van.freenix@gmail.com>
Cc: Peng Fan <peng.fan@nxp.com>, Julien Grall <julien@xen.org>, 
	"xen-users@lists.xenproject.org" <xen-users@lists.xenproject.org>
Content-Type: multipart/alternative; boundary="0000000000008d005c05bec28f44"

--0000000000008d005c05bec28f44
Content-Type: text/plain; charset="UTF-8"
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Hello Peng,

>> Without SMMU, you could not do device passthrough.
Noted, PV driver should still work is my understanding.

>> It will be a bit hard to achieve this. No SMMU, only one GPU.
If running Ubuntu + Android on top of Xen would be hard to achieve
on i.MX8MQ, what exactly is the target use case for NXP/CodeAurora port of
Xen [1] ?
I do see boards without SMMU listed in Xen wiki project, though [2]


Thanks,
Rajagopal

[1] - https://source.codeaurora.org/external/imx/imx-xen/
[2] - Xen ARM with Virtualization Extensions - Xen (xenproject.org)
<https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualization_Extensions>

On Mon, Mar 29, 2021 at 3:38 PM Peng Fan <van.freenix@gmail.com> wrote:

> Sorry for HTML format. Inline.
>
> Rajagopal Aravindan <a.rajagopal.81@gmail.com> =E4=BA=8E2021=E5=B9=B43=E6=
=9C=8829=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5=8D=884:01=E5=86=99=E9=81=
=93=EF=BC=9A
>
>> Hello Peng,
>>
>> Thank you for your response.
>>
>> >>There were people trying to upstream this SoC in community, you should
>> be able to find patches for 8MQ or 8MM.
>> Will take a look at Xen repo hosted by both LinuxFoundation as well as
>> CodeAurora  and get back.
>>
>> >>i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in
>> this chip.
>> Thanks for highlighting this and at this point in time, I see
>>
>>    1. performance suffering because of this and
>>    2. drivers may need to be modified, to arbitrate access to main
>>    memory, between themselves which otherwise SMMU would have taken care=
 of
>>    3. also, drivers need to ensure that they get ONLY those regions in
>>    the accessible range to the peripherals
>>
>> Can you please provide more insight on what the lack of SMMU means to
>> Xen, other than the above ?
>>
>
> Without SMMU, you could not do device passthrough.
>
>
>>
>> >> We not see customers requesting xen for i.MX8M*, not sure your
>> usecases.
>> I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence wa=
s
>> interested in trying Xen on the MQ board.
>> Mine is the normal use case of running a Ubuntu + Android on top of Xen,
>> and then running applications inside them.
>>
>
> It will be a bit hard to achieve this. No SMMU, only one GPU.
>
> Regards,
> Peng.
>
>
>>
>>
>> Regards,
>> Rajagopal
>>
>> On Mon, Mar 29, 2021 at 8:39 AM Peng Fan <peng.fan@nxp.com> wrote:
>>
>>> > Subject: Re: Xen - i.MX8QM vs i.MX8MQ
>>> >
>>> > (+ Peng)
>>>
>>> Thanks for adding me.
>>>
>>> >
>>> > On 26/03/2021 18:11, Rajagopal Aravindan wrote:
>>> > > Hello All,
>>> >
>>> > Hi,
>>> >
>>> > > Greetings !
>>> > >
>>> > > I came across a few links saying Xen is supported on NXP's i.MX8QM.
>>> > > But, I don't see any such thing for i.MX8MQ and people only talking
>>> > > about jailhouse hypervisor for MQ. [1]
>>> > >
>>> > > Can someone here clarify whether i.MX8MQ h/w is NOT compatible with
>>> > > Xen or the required piece of s/w is yet to be upstreamed to Xen ?
>>>
>>> i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in thi=
s
>>> chip.
>>>
>>> There were people trying to upstream this SoC in community, you should
>>> be able to find patches for 8MQ or 8MM.
>>>
>>> We not see customers requesting xen for i.MX8M*, not sure your usecases=
.
>>>
>>> Regards,
>>> Peng.
>>>
>>> >
>>> > I have seen users that are successfuly booting Xen on i.MX8, although
>>> they are
>>> > not directly using Xen Project tree but one provided by code aurora
>>> NXP (see
>>> > [1]).
>>> >
>>> > AFAIK, there might be some missing pieces in the Xen Project tree for
>>> that
>>> > board. I am not sure whether this is just to take full of advantage o=
f
>>> board.
>>> >
>>> > I have CCed Peng who might be able to provide support.
>>> >
>>> > Cheers,
>>> >
>>> > [1]
>>> >
>>> https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsou=
rce
>>> > .codeaurora.org%2Fexternal%2Fimx%2Fimx-xen%2F&amp;data=3D04%7C01%7
>>> > Cpeng.fan%40nxp.com%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1
>>> > d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn
>>> > known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
>>> > k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D7dIXYtfNCOAGNEsVMayTa
>>> > 5ddXkCwewnkLVUMjg4wVt8%3D&amp;reserved=3D0
>>> >
>>> > --
>>> > Julien Grall
>>>
>>
>
> --
>
>

--0000000000008d005c05bec28f44
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hello Peng,</div><div><br></div><div>&gt;&gt;

Without SMMU, you could not do device passthrough.

</div><div>Noted, PV driver should still work is my understanding.</div><di=
v><br></div><div>&gt;&gt; It will be a bit hard to achieve this. No SMMU, o=
nly one GPU.

</div><div></div><div>If running Ubuntu=C2=A0+ Android on top of Xen would=
=C2=A0be hard to achieve on=C2=A0i.MX8MQ, what exactly is the target use ca=
se for NXP/CodeAurora port of Xen [1] ?</div><div>I do see boards without S=
MMU listed in Xen wiki project, though [2]=C2=A0=C2=A0<br></div><div><br></=
div><div><br></div><div>Thanks,</div><div>Rajagopal</div><div><br></div><di=
v>[1] -=C2=A0<a href=3D"https://source.codeaurora.org/external/imx/imx-xen/=
">https://source.codeaurora.org/external/imx/imx-xen/</a></div><div>[2] -=
=C2=A0<a href=3D"https://wiki.xenproject.org/wiki/Xen_ARM_with_Virtualizati=
on_Extensions">Xen ARM with Virtualization Extensions - Xen (xenproject.org=
)</a><br></div><div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Mar 29, 2021 at 3:38 PM Peng Fan &lt;<a href=3D"mai=
lto:van.freenix@gmail.com">van.freenix@gmail.com</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div>Sorry=
 for HTML format. Inline.</div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">Rajagopal Aravindan &lt;<a href=3D"mailto:a.rajago=
pal.81@gmail.com" target=3D"_blank">a.rajagopal.81@gmail.com</a>&gt; =E4=BA=
=8E2021=E5=B9=B43=E6=9C=8829=E6=97=A5=E5=91=A8=E4=B8=80 =E4=B8=8B=E5=8D=884=
:01=E5=86=99=E9=81=93=EF=BC=9A<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Hello Peng,<div><br></div>=
<div>Thank you for your response.</div><div><br></div><div>&gt;&gt;There we=
re people trying to upstream this SoC in community, you should be able to f=
ind patches for 8MQ or 8MM.</div><div>Will take a look at Xen repo hosted b=
y both LinuxFoundation as well as CodeAurora=C2=A0 and get back.</div><div>=
<br></div><div>&gt;&gt;i.MX8MQ could use XEN hypervisor, but note that ther=
e is no SMMU in this chip.=C2=A0=C2=A0</div><div>Thanks for=C2=A0highlighti=
ng this and at this=C2=A0point in time, I see</div><div><ol><li>performance=
 suffering because of this and</li><li>drivers may need to be modified, to =
arbitrate access to main memory, between themselves which otherwise SMMU wo=
uld have taken care of</li><li>also, drivers need to ensure that they get O=
NLY those regions in the accessible range to the peripherals</li></ol></div=
><div>Can you please provide more insight on what the lack of SMMU means to=
 Xen, other than the above ?</div></div></div></blockquote><div><br></div><=
div>Without SMMU, you could not do device passthrough.</div><div>=C2=A0</di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div d=
ir=3D"ltr"><div><br></div><div>&gt;&gt;

We not see customers requesting xen for i.MX8M*, not sure your usecases.

</div><div>

I do NOT have a i.MX8QM board but ONLY have a i.MX8MQ board and hence was i=
nterested in trying Xen on the MQ board.=C2=A0</div><div>Mine is the normal=
 use case of running a Ubuntu=C2=A0+ Android on top of Xen, and then runnin=
g applications inside them.</div></div></div></blockquote><div><br></div><d=
iv>It will be a bit hard to achieve this. No SMMU, only one GPU.</div><div>=
<br></div><div>Regards,</div><div>Peng.</div><div>=C2=A0</div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr"><div=
><br></div><div></div></div><div dir=3D"ltr">=C2=A0=C2=A0<div>Regards,</div=
><div>Rajagopal</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, Mar 29, 2021 at 8:39 AM Peng Fan &lt;<a href=
=3D"mailto:peng.fan@nxp.com" target=3D"_blank">peng.fan@nxp.com</a>&gt; wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px =
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">&gt; Subject=
: Re: Xen - i.MX8QM vs i.MX8MQ<br>
&gt; <br>
&gt; (+ Peng)<br>
<br>
Thanks for adding me.<br>
<br>
&gt; <br>
&gt; On 26/03/2021 18:11, Rajagopal Aravindan wrote:<br>
&gt; &gt; Hello All,<br>
&gt; <br>
&gt; Hi,<br>
&gt; <br>
&gt; &gt; Greetings !<br>
&gt; &gt;<br>
&gt; &gt; I came across a few links saying Xen is supported on NXP&#39;s i.=
MX8QM.<br>
&gt; &gt; But, I don&#39;t see any such thing for i.MX8MQ and people only t=
alking<br>
&gt; &gt; about jailhouse hypervisor for MQ. [1]<br>
&gt; &gt;<br>
&gt; &gt; Can someone here clarify whether i.MX8MQ h/w is NOT compatible wi=
th<br>
&gt; &gt; Xen or the required piece of s/w is yet to be upstreamed to Xen ?=
<br>
<br>
i.MX8MQ could use XEN hypervisor, but note that there is no SMMU in this<br=
>
chip.<br>
<br>
There were people trying to upstream this SoC in community, you should<br>
be able to find patches for 8MQ or 8MM.<br>
<br>
We not see customers requesting xen for i.MX8M*, not sure your usecases.<br=
>
<br>
Regards,<br>
Peng.<br>
<br>
&gt; <br>
&gt; I have seen users that are successfuly booting Xen on i.MX8, although =
they are<br>
&gt; not directly using Xen Project tree but one provided by code aurora NX=
P (see<br>
&gt; [1]).<br>
&gt; <br>
&gt; AFAIK, there might be some missing pieces in the Xen Project tree for =
that<br>
&gt; board. I am not sure whether this is just to take full of advantage of=
 board.<br>
&gt; <br>
&gt; I have CCed Peng who might be able to provide support.<br>
&gt; <br>
&gt; Cheers,<br>
&gt; <br>
&gt; [1]<br>
&gt; <a href=3D"https://eur01.safelinks.protection.outlook.com/?url=3Dhttps=
%3A%2F%2Fsource" rel=3D"noreferrer" target=3D"_blank">https://eur01.safelin=
ks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fsource</a><br>
&gt; .<a href=3D"http://codeaurora.org" rel=3D"noreferrer" target=3D"_blank=
">codeaurora.org</a>%2Fexternal%2Fimx%2Fimx-xen%2F&amp;amp;data=3D04%7C01%7=
<br>
&gt; Cpeng.fan%<a href=3D"http://40nxp.com" rel=3D"noreferrer" target=3D"_b=
lank">40nxp.com</a>%7Cc60e9b08fe0949c6654608d8f0851e15%7C686ea1<br>
&gt; d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637523801815383189%7CUn<br>
&gt; known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I<br>
&gt; k1haWwiLCJXVCI6Mn0%3D%7C1000&amp;amp;sdata=3D7dIXYtfNCOAGNEsVMayTa<br>
&gt; 5ddXkCwewnkLVUMjg4wVt8%3D&amp;amp;reserved=3D0<br>
&gt; <br>
&gt; --<br>
&gt; Julien Grall<br>
</blockquote></div></div>
</blockquote></div><br clear=3D"all"><div><br></div>-- <br><div dir=3D"ltr"=
><div dir=3D"ltr"><br></div></div></div>
</blockquote></div></div></div>

--0000000000008d005c05bec28f44--


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Date: Tue, 30 Mar 2021 23:13:11 -0700
From: Bill MacAllister <bill@ca-zephyr.org>
To: xen-users@lists.xenproject.org
Subject: domu boot issue
Message-ID: <f942daf3b75c0b63148a5fe895dbef18@ca-zephyr.org>
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I thought I had solved my problems booting Ubuntu 20.04 domu on a
xen system build on Ubuntu 20.04, but when I went to build a new
domu to day I hit the error below.  This error looks like it is
having problems mounting the disk, but I can manually mount the
logical volume just fine.  What am I missing?  What should I look
at to debug the issue?

Thanks in advance,

Bill

# xl create -c /etc/xen/engine.ca-zephyr.org.cfg
Parsing config from /etc/xen/engine.ca-zephyr.org.cfg
libxl: error: libxl_device.c:1130:device_backend_callback: Domain 
15:unable to add device with path /local/domain/0/backend/vbd/15/51713
libxl: error: libxl_create.c:1299:domcreate_launch_dm: Domain 15:unable 
to add disk devices
libxl: error: libxl_device.c:1130:device_backend_callback: Domain 
15:unable to remove device with path 
/local/domain/0/backend/vbd/15/51713
libxl: error: libxl_domain.c:1107:devices_destroy_cb: Domain 
15:libxl__devices_destroy failed
libxl: error: libxl_domain.c:1034:libxl__destroy_domid: Domain 
15:Non-existant domain
libxl: error: libxl_domain.c:993:domain_destroy_callback: Domain 
15:Unable to destroy guest
libxl: error: libxl_domain.c:920:domain_destroy_cb: Domain 
15:Destruction of domain failed

Here is the cfg file for the host.

type   = 'pvh'
kernel = '/usr/lib/grub-xen/grub-i386-xen_pvh.bin'
vcpus  = '2'
memory = '8192'

root        = '/dev/xvda1 ro'
disk        = [
                   'phy:/dev/vg_xen/engine.ca-zephyr.org-disk,xvda1,w',
               ]

name        = 'engine.ca-zephyr.org'

dhcp        = 'dhcp'
vif         = [ 'mac=00:16:3E:2A:E3:83' ]

on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'


-- 
Bill MacAllister <bill@ca-zephyr.org>


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From: Lukas Tribus <lukas@ltri.eu>
Date: Wed, 31 Mar 2021 10:20:18 +0200
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Subject: Re: domu boot issue
To: bill@ca-zephyr.org
Cc: xen-users@lists.xenproject.org
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Hello Bill,

On Wed, 31 Mar 2021 at 08:13, Bill MacAllister <bill@ca-zephyr.org> wrote:
>
> I thought I had solved my problems booting Ubuntu 20.04 domu on a
> [snip]
>
>  libxl: error: libxl_device.c:1130:device_backend_callback: Domain
> 15:unable to add device with path /local/domain/0/backend/vbd/15/51713

It's a kernel regression, you need to wait for Ubuntu to release
5.4.0-71 or enable the HWE stack for a newer kernel on Ubuntu 20.04.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1920660


Lukas