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Re: [PATCH 0/3] virtgpu: check if P2P is possiable or not
- To: Julia Zhang <julia.zhang@xxxxxxx>, David Airlie <airlied@xxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxxxxx>, Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>, Chia-I Wu <olvaffe@xxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 12 Dec 2024 08:43:30 +0100
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- Cc: Alex Deucher <alexander.deucher@xxxxxxx>, Christian König <christian.koenig@xxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Chen Jiqian <Jiqian.Chen@xxxxxxx>, Huang Rui <ray.huang@xxxxxxx>, Penny Zheng <penny.zheng@xxxxxxx>, Zhu Lingshan <Lingshan.Zhu@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Thu, 12 Dec 2024 07:43:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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?
Juergen
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