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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

+ 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.
> 
> Thank you,
> 
> Stefano
> 

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