[PATCH v10 0/6] KVM: arm64: Map GPU device memory as cacheable

[Oliver Upton]

On Sat, 05 Jul 2025 07:17:11 +0000, ankita at nvidia.com wrote:
> From: Ankit Agrawal <ankita at nvidia.com>
> 
> Grace based platforms such as Grace Hopper/Blackwell Superchips have
> CPU accessible cache coherent GPU memory. The GPU device memory is
> essentially a DDR memory and retains properties such as cacheability,
> unaligned accesses, atomics and handling of executable faults. This
> requires the device memory to be mapped as NORMAL in stage-2.
> 
> [...]

I've gone through one additional round of bikeshedding on the series,
primarily fixing some typos and refining changelogs/comments. Note that
I squashed the kvm_arch_supports_cacheable_pfnmap() into the patch that
adds its caller and unwired it from arch-neutral code entirely.

Please do shout if there's an issue with any of this and thanks for
keeping up with the several rounds of review.

Applied to next, thanks!

[1/6] KVM: arm64: Rename the device variable to s2_force_noncacheable
      https://git.kernel.org/kvmarm/kvmarm/c/8cc9dc1ae4fb
[2/6] KVM: arm64: Update the check to detect device memory
      https://git.kernel.org/kvmarm/kvmarm/c/216887f79d98
[3/6] KVM: arm64: Block cacheable PFNMAP mapping
      https://git.kernel.org/kvmarm/kvmarm/c/2a8dfab26677
[5/6] KVM: arm64: Allow cacheable stage 2 mapping using VMA flags
      https://git.kernel.org/kvmarm/kvmarm/c/0c67288e0c8b
[6/6] KVM: arm64: Expose new KVM cap for cacheable PFNMAP
      https://git.kernel.org/kvmarm/kvmarm/c/f55ce5a6cd33

--
Best,
Oliver