Re: [Xen-devel] [BUG] pci-passthrough generates "xen:events: Failed to obtain physical IRQ" for some devices

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Feb 03, 2016 at 03:22:30PM +0100, Marek Marczykowski-Górecki wrote:
> On Mon, Feb 01, 2016 at 09:50:53AM -0500, Konrad Rzeszutek Wilk wrote:
> > > The second bullet looks at first pretty interesting from this PoV,
> > > see http://xenbits.xen.org/xsa/advisory-157.html for info on the XSA and
> > > the various patches. Konrad is on the CC already so hopefully he has some
> > > ideas.
> > 
> > Thanks. I will try to reproduce this with the upstream kernel first as
> > those patches are there.
> 
> According to one Qubes OS user report[1], the bug was introduced between
> version, which differs only by XSA-155 patches (including one for
> pciback), especially not XSA-157. 
> Maybe on some code path, some value is not copied back to pdev->sh_info->op?

I found two bugs (attached the draft not-compiled patches). Upstream
wise I seem to be tripping over another issue.

There is also some more work required in there to fix the MSI-x enable op.

Attachment: 0001-xen-pciback-Check-PF-instead-of-VF-for-PCI_COMMAND_M.patch
Description: Text document

Attachment: 0002-xen-pciback-Save-the-number-of-MSI-X-entries-to-be-c.patch
Description: Text document

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