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Re: [PATCH 00/17] Q35 initial support for HVM guests
- To: Thierry Escande <thierry.escande@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 5 May 2026 07:49:57 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 05 May 2026 05:50:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.05.2026 07:48, Jan Beulich wrote:
> On 04.05.2026 12:45, Jan Beulich wrote:
>> On 28.04.2026 09:48, Roger Pau Monné wrote:
>>> On Fri, Mar 13, 2026 at 04:35:01PM +0000, Thierry Escande wrote:
>>>> This series introduces initial Q35 chipset support for HVM guests, based
>>>> on the
>>>> patchset at [1] by Alexey Gerasimenko.
>>>>
>>>> Basic support means that this patchset allows to start an HVM guest that
>>>> emulates a Q35 chipset via Qemu and implements access to PCIe extended
>>>> configuration space for such devices emulated by Qemu.
>>>>
>>>> Support for PCIe device passthrough is not implemented yet. This is
>>>> planned but
>>>> implies modifications in the hypervisor and the firmwares, mainly for the
>>>> support of multiple PCI buses.
>>>
>>> Why do you need multi bus support to expose PCIe capabilities? I'm
>>> not seeing the relation between those two. You could still expose a
>>> single bus on the MCFG table.
>>
>> Can a valid PCIe topology be expressed with just bus 0? If an endpoint
>> to be handed to a guest isn't root complex integrated, would it be valid
>> to make it appear so by putting it on bus 0?
>
> We discussed this with Roger on our x86 call, and we came to the agreement
> that for the time being putting everything on bus 0 may be good enough.
> Introducing of bridge(s) and anything else that's required for multi-bus
> support will want to be a separate piece of work.
Oh, and: Where applicable this (deliberate) restriction (or should I say
mistreatment) will want calling out in description(s).
Jan
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