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Peter Anvin" , Borislav Petkov , x86@kernel.org, Ashish Kalra References: <20210420112006.741541-1-pbonzini@redhat.com> From: Paolo Bonzini Message-ID: <2b1f1764-bcb0-096a-8d44-aee94f2c85f3@redhat.com> Date: Tue, 20 Apr 2021 20:27:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 20/04/21 17:15, Sean Christopherson wrote: > On Tue, Apr 20, 2021, Paolo Bonzini wrote: >> Do not return the SEV-ES bit from KVM_GET_SUPPORTED_CPUID unless >> the corresponding module parameter is 1, and clear the memory encryption >> leaf completely if SEV is disabled. > > Impeccable timing, I was planning on refreshing my SEV cleanup series[*] today. > There's going to be an annoying conflict with the svm_set_cpu_caps() change > (see below), any objecting to folding your unintentional feedback into my series? That's fine of course. >> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h >> index 888e88b42e8d..e873a60a4830 100644 >> --- a/arch/x86/kvm/cpuid.h >> +++ b/arch/x86/kvm/cpuid.h >> @@ -99,6 +99,7 @@ static const struct cpuid_reg reverse_cpuid[] = { >> [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, >> [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, >> [CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX}, >> + [CPUID_8000_001F_EAX] = {0x8000001F, 0, CPUID_EAX}, >> }; >> >> /* >> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c >> index cd8c333ed2dc..acdb8457289e 100644 >> --- a/arch/x86/kvm/svm/svm.c >> +++ b/arch/x86/kvm/svm/svm.c >> @@ -923,6 +923,13 @@ static __init void svm_set_cpu_caps(void) >> if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) || >> boot_cpu_has(X86_FEATURE_AMD_SSBD)) >> kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD); >> + >> + /* CPUID 0x8000001F */ >> + if (sev) { >> + kvm_cpu_cap_set(X86_FEATURE_SEV); >> + if (sev_es) >> + kvm_cpu_cap_set(X86_FEATURE_SEV_ES); > > Gah, I completely spaced on the module params in my series, which is more > problematic than normal because it also moves "sev" and "sev_es" to sev.c. The > easy solution is to add sev_set_cpu_caps(). Sounds good. Paolo