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

[Juergen Gross <jgross@xxxxxxxx>]

On 26.06.19 00:10, Stefano Stabellini wrote:
> On Tue, 25 Jun 2019, Juergen Gross wrote:
> > On 24.06.19 20:45, 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.
> > Can you please post the Xenstore entries before the reboot?
> >
> > I think the numbering scheme of PCI devices in Xenstore isn't like that
> > of other devices...
> See attached. The domid goes from 3 to 5, because I shutdown domid 3
> normally the first time around, instead of rebooting.
As I thought. Working on a patch.


Juergen

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel