Re: [PATCH v2 3/6] hw/isa/piix: Wire up Xen PCI IRQ handling outside of PIIX3

[Chuck Zmudzinski <brchuckz@xxxxxxx>]

On 1/6/23 12:46 PM, Chuck Zmudzinski wrote:
> On 1/6/23 12:35 PM, David Woodhouse wrote:
>> On Wed, 2023-01-04 at 15:44 +0100, Bernhard Beschow wrote:
>>> +        if (xen_enabled()) {
>> 
>> Could this perhaps be if (xen_mode != XEN_DISABLED) once we merge the
>> Xen-on-KVM series?
> 
> I am not an expert and just on here as a user/tester, but I think it
> would depend on whether or not the Xen-on-KVM mode uses Xen PCI IRQ
> handling or Linux/KVM PCI IRQ handling.
> 
> Chuck

I could try Bernhard's patches in a Xen-on-KVM configuration if that might help.
I would need help configuring the Xen-on-KVM mode to do it, though, because
I have never tried Xen-on-KVM before.

The test I could do would be to:

1) Test my Xen guest that uses the current PIIX3-xen device in the
Xen-on-KVM environment and get that working.

2) Apply Bernhard's patch series and see what, if anything, needs to
be done to make Bernhard's patch work in Xen-on-KVM. I have already
verified that Bernhard's patches work well with Xen on bare metal, so I
don't think we need to answer this question before going forward with
Bernhard's patches. This can be patched later to support Xen-on-KVM if
necessary as part of or in addition to the Xen-on-KVM series.

Chuck