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Re: [PATCH 17/23] xsm/dummy: Allow hwdom more - except targeting control
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 17 Mar 2025 17:25:24 +0100
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 17 Mar 2025 16:25:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.03.2025 17:23, Jan Beulich wrote:
> On 17.03.2025 17:17, Jason Andryuk wrote:
>> On 2025-03-17 10:28, Jan Beulich wrote:
>>> On 06.03.2025 23:03, Jason Andryuk wrote:
>>>> Allow hwdom all perms, except XSM_PRIV, and except commands where the
>>>> target is the control domain. This protects the control domain from
>>>> hwdom while allowing the hardware domain to serve as the backend and
>>>> device model for other domUs.
>>>
>>> I can see why backends may need to live there. But device models don't
>>> belong in the hardware domain, do they?
>>
>> One of my tests was on x86 with hardware domain running QEMU providing
>> virtio-gpu to a domU. QEMU needs to access the GPU for virtio-gpu.
>> Also HVM/QEMU PCI passthrough would need to run from hardware domain.
>> for the config space access.
>>
>> I viewed the hardware domain as the place to run the device model - sort
>> of like a stubdom moving out of dom0.
>
> Hmm, yes, when dealing with hardware made accessible to a guest, the DM
> would need to live in hwdom (in the absence of stubdom-s). For non-pass-
> through guests that's less clear though.
So perhaps I'm in (conceptual) trouble with this kind of dis-aggregation:
To split ctrldom from hwdom without moving DMs to stubdom-s feels a little
"incomplete" to me.
Jan
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