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virtio-gpu: Mapping blob resources

From: Antonio Caggiano
Subject: virtio-gpu: Mapping blob resources
Date: Fri, 23 Jul 2021 15:33:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0


I am trying to implement blob resource mapping support, but there is something I still did not manage to figure out.

According to the spec, VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB maps a host-only blob resource into an offset in the host visible memory region. So, I believe I will need something like:

> void *data = g->hotstmem[mblob.offset]; // pseudo-code
> virgl_renderer_resource_map(..., &data, ...);

- Does my approach make sense?
- How do I get an address to the host visible memory region?

Best regards,

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