2020-03-23 09:24:24

by Zhenyu Wang

Subject: [PATCH] KVM: x86: Expose fast short REP MOV for supported cpuid

For CPU supporting fast short REP MOV (XF86_FEATURE_FSRM) e.g Icelake,
Tigerlake, expose it in KVM supported cpuid as well.

Signed-off-by: Zhenyu Wang <[email protected]>
---
arch/x86/kvm/cpuid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 435a7da07d5f..cf6da12bd17a 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -338,7 +338,7 @@ void kvm_set_cpu_caps(void)
kvm_cpu_cap_mask(CPUID_7_EDX,
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(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM)
);

/* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
--
2.25.1

2020-03-23 13:00:20

by Paolo Bonzini

Subject: Re: [PATCH] KVM: x86: Expose fast short REP MOV for supported cpuid

On 23/03/20 10:22, Zhenyu Wang wrote:
> For CPU supporting fast short REP MOV (XF86_FEATURE_FSRM) e.g Icelake,
> Tigerlake, expose it in KVM supported cpuid as well.
>
> Signed-off-by: Zhenyu Wang <[email protected]>
> ---
> arch/x86/kvm/cpuid.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 435a7da07d5f..cf6da12bd17a 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -338,7 +338,7 @@ void kvm_set_cpu_caps(void)
> kvm_cpu_cap_mask(CPUID_7_EDX,
> 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(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM)
> );
>
> /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */
>

Queued, thanks.

Paolo