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Re: [PATCH 0/3] virtgpu: check if P2P is possiable or not
- To: Juergen Gross <jgross@xxxxxxxx>, "Zhang, Julia" <Julia.Zhang@xxxxxxx>, David Airlie <airlied@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>, Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>, Chia-I Wu <olvaffe@xxxxxxxxx>, "dri-devel@xxxxxxxxxxxxxxxxxxxxx" <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, "virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx" <virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Zhang, Julia" <Julia.Zhang@xxxxxxx>
- Date: Fri, 13 Dec 2024 09:58:50 +0000
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- Delivery-date: Fri, 13 Dec 2024 09:59:04 +0000
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- Thread-topic: [PATCH 0/3] virtgpu: check if P2P is possiable or not
On 2024/12/12 15:43, Juergen Gross wrote:
> On 07.12.24 11:50, Julia Zhang wrote:
>> To implement dGPU prime feature, virtgpu needs to import/export buffer
>> between virtio iGPU and passthrough dGPU. Before that, virtgpu should
>> check if P2P is possible or not. But calling function
>> pci_p2pdma_distance
>> in guest VM will only get virtual p2pdma_distance instead of real
>> physical
>> p2pdma_distance.
>> So this series introduce an implementation of virtgpu device_attach
>> callback to get p2pdma_distance. And also adds a new virtgpu command to
>> pass PCI notations from guest to host and a new xen privcmd to get
>> physical
>> p2pdma_distance according to the PCI notations in host.
>
> It is hard to review this series without having a clear picture how
> this all is coming together.
>
> I guess the virtgpu frontend will send a p2pdma_distance request to
> the backend, which is running in user mode of dom0. This backend will
> then call into the privcmd driver to obtain the needed information and
> sends it back to the frontend.
>
> Can you please confirm my suspicion is correct?
Yes, you are right.
Julia
>
>
> Juergen
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