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[4/4] KVM: x86: Advertise AVX-VNNI-INT16 CPUID to userspace

Message ID 20241104063559.727228-5-tao1.su@linux.intel.com (mailing list archive)
State New
Headers show
Series Advertise CPUID for new instructions in Clearwater Forest | expand

Commit Message

Tao Su Nov. 4, 2024, 6:35 a.m. UTC 
AVX-VNNI-INT16 is a new set of instructions in the latest Intel platform
Clearwater Forest, which can multiply and add unsigned and signed words
with and without saturation.

AVX-VNNI-INT16 is enumerated via CPUID.(EAX=7,ECX=1):EDX[bit 10].

Advertise AVX-VNNI-INT16 if it's supported in hardware. There are no new
VMX controls for the feature, i.e. the instructions can't be intercepted
and only use xmm, ymm registers.

Tested-by: Jiaan Lu <jiaan.lu@intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Signed-off-by: Tao Su <tao1.su@linux.intel.com>
---
 arch/x86/kvm/cpuid.c         | 4 ++--
 arch/x86/kvm/reverse_cpuid.h | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 160b060121b2..68cde739a5a3 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -704,8 +704,8 @@  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(AMX_COMPLEX) | F(AVX10)
+		F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(AMX_COMPLEX) |
+		F(AVX_VNNI_INT16) | F(PREFETCHITI) | F(AVX10)
 	);
 
 	kvm_cpu_cap_init_kvm_defined(CPUID_7_2_EDX,
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index 0d17d6b70639..e46220ece83c 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -46,6 +46,7 @@  enum kvm_only_cpuid_leafs {
 #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_AVX_VNNI_INT16      KVM_X86_FEATURE(CPUID_7_1_EDX, 10)
 #define X86_FEATURE_PREFETCHITI         KVM_X86_FEATURE(CPUID_7_1_EDX, 14)
 #define X86_FEATURE_AVX10               KVM_X86_FEATURE(CPUID_7_1_EDX, 19)