Re: [Xen-devel] Xen 4.4 development update: Is PVH a blocker?

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Monday, December 16, 2013, 4:09:06 PM, you wrote:

>> >> * qemu-upstream not freeing pirq
>> >>  > http://www.gossamer-threads.com/lists/xen/devel/281498
>> >>  > http://marc.info/?l=xen-devel&m=137265766424502
>> >>  status: patches posted; latest patches need testing
>> >>  Not a blocker.
>> 
>> > I can't test it, b/c qemu-upstream does not work with PCI passthrough
>> > anymore.
>> 
>> Strange, pci passthrough in general works for me on "simple" pci devices 
>> (usb cards, videograbber) with latest qemu-upstream and seabios upstream.
>> (if you have no need for pci rombars, no vga passthrough, no need for 
>> specifying funky things about which virtual functions to passthrough)
>> 
>> What are you trying to passthrough ?

> -bash-4.1# lspci -s 01:00.0 -v 
> 01:00.0 Ethernet controller: Intel Corporation 82576 Gigabit Network 
> Connection (rev 01)
>         Subsystem: Intel Corporation Gigabit ET Dual Port Server Adapter
>         Flags: fast devsel, IRQ 16
>         Memory at fbc20000 (32-bit, non-prefetchable) [disabled] [size=128K]
>         Memory at fb800000 (32-bit, non-prefetchable) [disabled] [size=4M]
>         I/O ports at e020 [disabled] [size=32]
>         Memory at fbc44000 (32-bit, non-prefetchable) [disabled] [size=16K]
>         Expansion ROM at fb400000 [disabled] [size=4M]
>         Capabilities: [40] Power Management version 3
>         Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
>         Capabilities: [70] MSI-X: Enable- Count=10 Masked-
>         Capabilities: [a0] Express Endpoint, MSI 00
>         Capabilities: [100] Advanced Error Reporting
>         Capabilities: [140] Device Serial Number 00-1b-21-ff-ff-45-d9-ac
>         Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
>         Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
>         Kernel driver in use: pciback
>         Kernel modules: igb


>> What problems do you have / errors do you see ?
>> 

> http://www.gossamer-threads.com/lists/xen/devel/309476?do=post_view_threaded


Could it be related to the outstanding issue (since 4.3) of:

* PCI hole resize support hvmloader/qemu-traditional/qemu-upstream with PCI/GPU 
passthrough
  > http://lists.xen.org/archives/html/xen-devel/2013-05/msg02813.html
  > Where Stefano writes:
  > 2) for Xen 4.4 rework the two patches above and improve
  > i440fx_update_pci_mem_hole: resizing the pci_hole subregion is not
  > enough, it also needs to be able to resize the system memory region
  > (xen.ram) to make room for the bigger pci_hole

  Your card seems to need quite some resources, and restricted to 32bit, even 
other SR-IOV cards seems to to with less and or support 32 bit.


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