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| author | Chang S. Bae <[email protected]> | 2022-11-25 12:58:41 +0000 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2022-11-28 18:33:27 +0000 |
| commit | af2872f6225476566bcbbd523a74dcaba29e159e (patch) | |
| tree | 77f67d3c838b5e5cff455f52fe87fe2176ee1d94 /drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | |
| parent | x86: KVM: Advertise CMPccXADD CPUID to user space (diff) | |
| download | kernel-af2872f6225476566bcbbd523a74dcaba29e159e.tar.gz kernel-af2872f6225476566bcbbd523a74dcaba29e159e.zip | |
x86: KVM: Advertise AMX-FP16 CPUID to user space
Latest Intel platform Granite Rapids has introduced a new instruction -
AMX-FP16, which performs dot-products of two FP16 tiles and accumulates
the results into a packed single precision tile. AMX-FP16 adds FP16
capability and also allows a FP16 GPU trained model to run faster
without loss of accuracy or added SW overhead.
The bit definition:
CPUID.(EAX=7,ECX=1):EAX[bit 21]
AMX-FP16 is on an expected-dense CPUID leaf and some other bits on this
leaf have kernel usages. Given that, define this feature bit like
X86_FEATURE_<name> in kernel. Considering AMX-FP16 itself has no truly
kernel usages and /proc/cpuinfo has too much unreadable flags, hide this
one in /proc/cpuinfo.
Advertise AMX-FP16 to KVM userspace. This is safe because there are no
new VMX controls or additional host enabling required for guests to use
this feature.
Signed-off-by: Chang S. Bae <[email protected]>
Signed-off-by: Jiaxi Chen <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c')
0 files changed, 0 insertions, 0 deletions