Latest Intel platform Granite Rapids has introduced a new instruction - PREFETCHIT0/1, which moves code to memory (cache) closer to the processor depending on specific hints. The bit definition: CPUID.(EAX=7,ECX=1):EDX[bit 14] This patch enables this CPUID in the kernel feature bits and expose it to guest OS. Signed-off-by: Jiaxi Chen <jiaxi.chen@xxxxxxxxxxxxxxx> --- arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kvm/cpuid.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 4e0bbffedbb4..de8aa62bbdb1 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -426,6 +426,7 @@ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EDX), word 20 */ #define X86_FEATURE_AVX_VNNI_INT8 (20*32+ 4) /* Support for VPDPB[SU,UU,SS]D[,S] */ #define X86_FEATURE_AVX_NE_CONVERT (20*32+ 5) /* AVX NE CONVERT Instructions */ +#define X86_FEATURE_PREFETCHITI (20*32+14) /* PREFETCHIT0/1 Instructions */ /* * BUG word(s) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index fcd00c68e546..e73307732d10 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -661,7 +661,7 @@ void kvm_set_cpu_caps(void) F(AVX_IFMA)); kvm_cpu_cap_mask(CPUID_7_1_EDX, - F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) + F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(PREFETCHITI) ); kvm_cpu_cap_mask(CPUID_D_1_EAX, -- 2.27.0
