Re: [Xen-devel] PCI/VGA passthrough on >Xen-4.2 - (XEN) AMD-Vi: IO_PAGE_FAULT:

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-11-09 at 16:25 +0000, Hans Mueller wrote:
> On Thursday, 8. November 2012 20:02:51 feral wrote:
> > Upgraded from Xen-4.1 to 4.2/4.3/4.3-unstable.  Tested against all three.
> > 
> > VGA passthrough previously working with 4.1 is no longer working with >4.2.
> > 
> > Setup - Working:
> > Mint13, kernel-3.2.0-32, Xen-4.1 (from Ubuntu-Precise repos), libvirt-bin,
> > xend
> > Asus Radeon HD 7870 DirectCU.
> > Works perfect.  Benches on par with bare metal.
> > 
> > Setup - Broken:
> > Mint13, kernel-3.2.0-32, Xen-4.2,Xen-4.3,Xen-4.3-unstable (from GIT), xl
> > toolstack.
> > Asus Radeon HD 7870 DirectCU.
> > Some times the guest boots correctly but display is never enabled.
> >  Sometimes BSOD, doesn't seem to be any rhyme or reason?
> > 
> > No errors in logs.   Found the following in 'xl dmesg':
> > (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 2, device id = 0x600, fault address =
> > 0x1ac800000, flags = 0
> 
> I had a similar problem since hg revision 25818:50adc933faaf which changes 
> the 
> qemu tag.
> It looks like the qemu commit 
> 3e66da7266c84638c0e22a09c9d2b07529802576 
> (qemu-xen-trad: fix msi_translate with PV event delivery) 
> causes this behavior.
> 
> I solved the problem for me by using 'pci_msitranslate=0' in the domU config.

I don't follow this stuff closely but I could have sworn we had disabled
msitranslate by default.

In any case I don't think that changeset was intended to cause anything
like this -- Stefano?

> In addition I had to reboot (perhaps poweroff?) the dom0 once the 
> IO_PAGE_FAULT 
> occured.
> 
> Regards
> Hans
> 
> 
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