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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id l7-20020a170902f68700b00177fb862a87sm3983255plg.20.2022.11.18.08.08.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Nov 2022 08:08:29 -0800 (PST) Date: Fri, 18 Nov 2022 16:08:25 +0000 From: Sean Christopherson To: Jiaxi Chen Cc: kvm@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, ndesaulniers@google.com, alexandre.belloni@bootlin.com, peterz@infradead.org, jpoimboe@kernel.org, chang.seok.bae@intel.com, pawan.kumar.gupta@linux.intel.com, babu.moger@amd.com, jmattson@google.com, sandipan.das@amd.com, tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, fenghua.yu@intel.com, keescook@chromium.org, nathan@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 3/6] x86: KVM: Advertise AVX-IFMA CPUID to user space Message-ID: References: <20221118141509.489359-1-jiaxi.chen@linux.intel.com> <20221118141509.489359-4-jiaxi.chen@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20221118141509.489359-4-jiaxi.chen@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Nov 18, 2022, Jiaxi Chen wrote: > AVX-IFMA is a new instruction in the latest Intel platform Sierra > Forest. This instruction packed multiplies unsigned 52-bit integers and > adds the low/high 52-bit products to Qword Accumulators. > > The bit definition: > CPUID.(EAX=7,ECX=1):EAX[bit 23] > > This CPUID is exposed to user space. Besides, there is no other VMX > control for this instruction. > > Signed-off-by: Jiaxi Chen > --- > arch/x86/include/asm/cpufeatures.h | 1 + > arch/x86/kvm/cpuid.c | 4 ++-- > 2 files changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index df4a7f7505a9..159f8b9898bf 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -310,6 +310,7 @@ > #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ > #define X86_FEATURE_CMPCCXADD (12*32+ 7) /* CMPccXADD instructions */ > #define X86_FEATURE_AMX_FP16 (12*32+21) /* AMX fp16 Support */ > +#define X86_FEATURE_AVX_IFMA (12*32+23) /* Support for VPMADD52[H,L]UQ */ > > /* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */ > #define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */ > diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c > index 2a334d4cd04e..5726afb2d14c 100644 > --- a/arch/x86/kvm/cpuid.c > +++ b/arch/x86/kvm/cpuid.c > @@ -657,8 +657,8 @@ 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_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) | > + F(AVX_IFMA)); Please keep the terminating paranthesis+semicolon on a separate line. KVM isn't 100% consistent (as usual), but I would rather "fix" the cases that don't put the terminators on their own line.