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([2001:b07:6468:f312:4783:a68:c1ee:15c5]) by smtp.googlemail.com with ESMTPSA id tz14-20020a170907c78e00b0078ddb518a90sm1433630ejc.223.2022.11.04.01.02.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Nov 2022 01:02:34 -0700 (PDT) Message-ID: <6c71fcca-c17f-5979-e15e-afcf08899064@redhat.com> Date: Fri, 4 Nov 2022 09:02:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0 Subject: Re: [PATCH 33/44] KVM: x86: Do VMX/SVM support checks directly in vendor code Content-Language: en-US To: Sean Christopherson Cc: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Vitaly Kuznetsov , James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Isaku Yamahata , Fabiano Rosas , Michael Ellerman , Chao Gao , Thomas Gleixner , Yuan Yao References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-34-seanjc@google.com> From: Paolo Bonzini In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On 11/3/22 19:58, Sean Christopherson wrote: > > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index 3e508f239098..ebe617ab0b37 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -191,6 +191,8 @@ static void default_init(struct cpuinfo_x86 *c) > strcpy(c->x86_model_id, "386"); > } > #endif > + > + clear_cpu_cap(c, X86_FEATURE_MSR_IA32_FEAT_CTL); > } > > static const struct cpu_dev default_cpu = { Not needed I think? default_init does not call init_ia32_feat_ctl. > diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c > index c881bcafba7d..3a7ae67f5a5e 100644 > --- a/arch/x86/kernel/cpu/cpuid-deps.c > +++ b/arch/x86/kernel/cpu/cpuid-deps.c > @@ -72,6 +72,8 @@ static const struct cpuid_dep cpuid_deps[] = { > { X86_FEATURE_AVX512_FP16, X86_FEATURE_AVX512BW }, > { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES }, > { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA }, > + { X86_FEATURE_VMX, X86_FEATURE_MSR_IA32_FEAT_CTL }, > + { X86_FEATURE_SGX, X86_FEATURE_MSR_IA32_FEAT_CTL }, > { X86_FEATURE_SGX_LC, X86_FEATURE_SGX }, > { X86_FEATURE_SGX1, X86_FEATURE_SGX }, > { X86_FEATURE_SGX2, X86_FEATURE_SGX1 }, > Yes, good idea. Paolo