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([2001:b07:6468:f312:24d8:ed40:c82a:8a01]) by smtp.gmail.com with ESMTPSA id g14sm22381288wme.32.2020.03.23.05.58.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Mar 2020 05:58:57 -0700 (PDT) Subject: Re: [PATCH] KVM: x86: Expose fast short REP MOV for supported cpuid To: Zhenyu Wang Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200323092236.3703-1-zhenyuw@linux.intel.com> From: Paolo Bonzini Message-ID: <5bf4035d-4c37-be3f-cfe2-759ccc0bc17d@redhat.com> Date: Mon, 23 Mar 2020 13:58:56 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200323092236.3703-1-zhenyuw@linux.intel.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 > --- > 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