diff options
| author | Tao Su <tao1.su@linux.intel.com> | 2023-08-02 10:29:54 +0800 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-08-03 15:40:17 -0700 |
| commit | 99b668545356115e11a6cca519361c8cfd02569e (patch) | |
| tree | 1b580315ab04ebd32546d3eb2f4b6b5a4fbceed7 /arch/x86/kvm/cpuid.c | |
| parent | a788fbb763b5001f67f2ecdf207a357f9b12838f (diff) | |
| download | linux-99b668545356115e11a6cca519361c8cfd02569e.tar.gz linux-99b668545356115e11a6cca519361c8cfd02569e.tar.bz2 linux-99b668545356115e11a6cca519361c8cfd02569e.zip | |
KVM: x86: Advertise AMX-COMPLEX CPUID to userspace
Latest Intel platform GraniteRapids-D introduces AMX-COMPLEX, which adds
two instructions to perform matrix multiplication of two tiles containing
complex elements and accumulate the results into a packed single precision
tile.
AMX-COMPLEX is enumerated via CPUID.(EAX=7,ECX=1):EDX[bit 8]
Advertise AMX_COMPLEX if it's supported in hardware. There are no VMX
controls for the feature, i.e. the instructions can't be interecepted, and
KVM advertises base AMX in CPUID if AMX is supported in hardware, even if
KVM doesn't advertise AMX as being supported in XCR0, e.g. because the
process didn't opt-in to allocating tile data.
Signed-off-by: Tao Su <tao1.su@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20230802022954.193843-1-tao1.su@linux.intel.com
[sean: tweak last paragraph of changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index ad6566636c22..5a88affb2e1a 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -647,7 +647,8 @@ void kvm_set_cpu_caps(void) ); kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX, - F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(PREFETCHITI) + F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(PREFETCHITI) | + F(AMX_COMPLEX) ); kvm_cpu_cap_mask(CPUID_D_1_EAX, |