diff options
| author | Cathy Zhang <[email protected]> | 2020-12-07 19:34:41 -0800 |
|---|---|---|
| committer | Paolo Bonzini <[email protected]> | 2020-12-11 19:00:59 -0500 |
| commit | 2224fc9efb2d6593fbfb57287e39ba4958b188ba (patch) | |
| tree | 3d7e64cba68df1c030f97ebaeaa5cefb52ff0313 | |
| parent | e1b35da5e624f8b09d2e98845c2e4c84b179d9a4 (diff) | |
KVM: x86: Expose AVX512_FP16 for supported CPUID
AVX512_FP16 is supported by Intel processors, like Sapphire Rapids.
It could gain better performance for it's faster compared to FP32
if the precision or magnitude requirements are met. It's availability
is indicated by CPUID.(EAX=7,ECX=0):EDX[bit 23].
Expose it in KVM supported CPUID, then guest could make use of it; no
new registers are used, only new instructions.
Signed-off-by: Cathy Zhang <[email protected]>
Signed-off-by: Kyung Min Park <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Reviewed-by: Tony Luck <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 5d352cc204ce..a22a3108b5f0 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -419,7 +419,7 @@ void kvm_set_cpu_caps(void) F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) | - F(SERIALIZE) | F(TSXLDTRK) + F(SERIALIZE) | F(TSXLDTRK) | F(AVX512_FP16) ); /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */ |