Re: [Xen-devel] [Xen EFI] Impossible to limit the dom0 memory

["msd+xen-devel@xxxxxx" <msd+xen-devel@xxxxxx>]

Hi Jan, hi Juergen,

I'm trying again this week to install Xen on a OVH server 
(https://www.ovh.com/fr/serveurs_dedies/infra/1801eg02.xml).
It is still impossible to boot Xen with the option "dom0_mem=1G,max:1G" 
(boot : EFI->xen).
I have tried with Debian 9 stable/stretch :
- grub2 (2.02~beta3-5+deb9u1)  : https://packages.debian.org/stretch/grub2
- xen-system-amd64 (4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10) : 
https://packages.debian.org/stretch/xen-system-amd64
- linux-image-amd64 (4.9+80+deb9u6)  (4.9+80+deb9u6) 
https://packages.debian.org/stretch/linux-image-amd64
I have tried with Debian 10 testing/buster :
- grub2 (2.02+dfsg1-8) : https://packages.debian.org/buster/grub2
- xen-system-amd64 (4.11.1~pre.20180911.5acdd26fdc+dfsg-5) : 
https://packages.debian.org/buster/xen-system-amd64
- linux-image-amd64 (4.18+99) : 
https://packages.debian.org/buster/linux-image-amd64
# cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 158
model name      : Intel(R) Xeon(R) CPU E3-1270 v6 @ 3.80GHz
stepping        : 9
microcode       : 0x8e

Microcode version seems to be up to date :
https://www.intel.com/content/dam/www/public/us/en/documents/sa00115-microcode-update-guidance.pdf

Here is my WORKING xen.cfg file :
```
[global]
default=xen

[xen]
options=smt=on
kernel=$VMLINUZ_NAME root=/dev/md3 ro rootdelay=10 noquiet nosplash
ramdisk=$INITRD_NAME
```

Here is my FAILING xen.cfg file (with dom0_mem=1G,max:1G) :
```
[global]
default=xen

[xen]
options=smt=on dom0_mem=1G,max:1G
kernel=vmlinuz root=/dev/md3 ro rootdelay=10 noquiet nosplash
ramdisk=initrd.img
```

For information, if helpful :
- Booting Linux with EFI->grub->Linux works fine.
- Booting Xen with EFI->grub->Xen fails too (In January I only had 1/8 
core available, now I cannot boot but I will discuss this problem in 
another thread).

Do you have more information on the dom0_mem argument problem ?

Best regards,


Guillaume

Le 25/01/2018 à 17:07, msd+xen-devel@xxxxxx a écrit :
> I have installed `linux-image-amd64-dbg` and `binutils`.
>
> I can now execute `addr2line -pfi -e vmlinux-4.14.0-0.bpo.3-amd64 <addr>`.
>
> I have generated a file "commands.txt" with all the addresses after 
> "Guest stack trace from rsp=ffffffff82003cb0:" in my log file 
> "dom0_crash_with_dom0_memory.txt".
> I attached the result : "result.txt".
>
> We can see inside this file "xen/mmu_pv.c:1548" and 
> "drivers/firmware/efi/efi.c:558", so I hope it will be helpful.
> Is that ok for you ?
> Can I do something more ?
>
> Regards,
>
>
> Guillaume
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