Re: [Xen-devel] PCI Passthrough bug with x86 HVM

[Juergen Gross <jgross@xxxxxxxx>]

On 24.06.19 20:47, Stefano Stabellini wrote:
> + xen-devel
>
> On Mon, 24 Jun 2019, Stefano Stabellini wrote:
> > Hi all,
> >
> > I might have found a bug with PCI passthrough to a Linux HVM guest on
> > x86 with Xen 4.12. It is not easy for me to get access, and especially
> > change components, on this particular system, and I don't have access to
> > other x86 boxes at the moment, so apologies for the partial information
> > report. The setup is as follow:
> >
> > - two PCI devices have been assigned to a HVM guest, everything is fine
> > - reboot the guest from inside, i.e. `reboot' in Linux
> > - after the reboot completes, only one device is assigned
> >
> > Before the reboot, I see all the appropriate xenstore entries for both
> > devices. Everything is fine. After the reboot, I can only see the
> > xenstore entries of one device. It is as if the other device
> > "disappeared" without throwing any errors.
> >
> > Have you seen this before? Do you know if it has been fixed in staging?
> > I noticed this fix which seems to be very relevant:
> >
> > https://lists.xenproject.org/archives/html/xen-devel/2018-11/msg01616.html
> >
> > but it is already included in 4.12.
Stefano, could you please try the attached patch? It is only compile
tested for now.


Juergen

Attachment: 0001-libxl-fix-pci-device-re-assigning-after-domain-reboo.patch
Description: Text Data

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