KVM: x86: Advertise fast REP string features inherent to the CPU

Fast zero-length REP MOVSB, fast short REP STOSB, and fast short REP
{CMPSB,SCASB} are inherent features of the processor that cannot be
hidden by the hypervisor. When these features are present on the host,
enumerate them in KVM_GET_SUPPORTED_CPUID.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220901211811.2883855-2-jmattson@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 2a9f1e200dbc3fb1f5578d445c7571946e3e8fc9..d37cdab18715f060e63cc705e839135d18aa3e70 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -664,8 +664,9 @@ void kvm_set_cpu_caps(void)
                kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD);
 
        kvm_cpu_cap_mask(CPUID_7_1_EAX,
-               F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) |
-               F(AVX_IFMA)
+               F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) |
+               F(FZRM) | F(FSRS) | F(FSRC) |
+               F(AMX_FP16) | F(AVX_IFMA)
        );
 
        kvm_cpu_cap_init_kvm_defined(CPUID_7_1_EDX,