On 10/1/2026 11:54 PM, Mario Limonciello (AMD) wrote:
> PerfOpt is only a feature usable by integrated GPUs and only in identity
> mode. Instead of leaving a policy knob in amdgpu, just turn it on when
> an integrated GPU is in identity.
>
> PerfOpt locks the GPU into identity mode where the DTE is ignored, so mark
> it require_direct (blocks VFIO/iommufd claims) and disable PASID (no GCR3
> table in the fast path).
>
> This drops quite a bit of compatibility glue. There was a refcounting
> system, exported symbols, and device attach/detach logic. By just setting
> it immediately it's a lot more straightforward.
>
> Suggested-by: Jason Gunthorpe <[email protected]>
> Signed-off-by: Mario Limonciello (AMD) <[email protected]>
> ---
> v4:
> * Disable PASID for PerfOpt devices
> * Don't allow attaching a blocked domain
This will block attaching device to guest via vfio-pci. Is that fine?
-Vasant
