On 8/2/2023 10:29 AM, Tao Su wrote:
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]
Since there are no new VMX controls or additional host enabling required
for guests to use this feature, advertise the CPUID to userspace.
Signed-off-by: Tao Su <tao1.su@xxxxxxxxxxxxxxx>
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
arch/x86/kvm/cpuid.c | 3 ++-
arch/x86/kvm/reverse_cpuid.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 7f4d13383cf2..883ec8d5a77f 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,
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index 56cbdb24400a..b81650678375 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -43,6 +43,7 @@ enum kvm_only_cpuid_leafs {
/* Intel-defined sub-features, CPUID level 0x00000007:1 (EDX) */
#define X86_FEATURE_AVX_VNNI_INT8 KVM_X86_FEATURE(CPUID_7_1_EDX, 4)
#define X86_FEATURE_AVX_NE_CONVERT KVM_X86_FEATURE(CPUID_7_1_EDX, 5)
+#define X86_FEATURE_AMX_COMPLEX KVM_X86_FEATURE(CPUID_7_1_EDX, 8)
#define X86_FEATURE_PREFETCHITI KVM_X86_FEATURE(CPUID_7_1_EDX, 14)
/* CPUID level 0x80000007 (EDX). */
base-commit: 5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
