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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 9 Nov 2012, Ian Campbell wrote:
> 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?

No, it wasn't.

Can you please try reverting that specific commit on the qemu tree and
let me know if everything works afterwards (git revert
3e66da7266c84638c0e22a09c9d2b07529802576)?
Are you testing with a Linux or a Windows guest?

In any case, it is always safer to run with msi_translate=0, we have
found problems in the past using msi_translate with Nvidia graphic
cards.

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