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([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id q10sm7410951eds.36.2021.04.26.02.26.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 26 Apr 2021 02:26:51 -0700 (PDT) Subject: Re: [PATCH v3 0/4] KVM: x86: MSR_TSC_AUX fixes and improvements To: Sean Christopherson Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Reiji Watanabe References: <20210423223404.3860547-1-seanjc@google.com> From: Paolo Bonzini Message-ID: Date: Mon, 26 Apr 2021 11:26:49 +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: <20210423223404.3860547-1-seanjc@google.com> 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 24/04/21 00:34, Sean Christopherson wrote: > Fix potential cross-vendor landmines due to Intel and AMD having different > behavior for MSR_TSC_AUX[63:32], unify the logic across SVM and VMX, and > switch MSR_TSC_AUX via user return MSRs on SVM (the original goal). > > v3: > - Fix a comment typo. [Reiji] > - Add patches to add missing guest_cpuid_has() check, drop bits 63:32 on > AMD, and unify VMX and SVM emulation. > - Rebase to kvm/next, commit c4f71901d53b ("Merge tag 'kvmarm-5.13' ... ) > > v2: > - Rebase to kvm/queue (ish), commit 0e91d1992235 ("KVM: SVM: Allocate SEV > command structures on local stack") > - https://lkml.kernel.org/r/20210422001736.3255735-1-seanjc@google.com > > v1: https://lkml.kernel.org/r/20210206003224.302728-1-seanjc@google.com > > > Sean Christopherson (4): > KVM: SVM: Inject #GP on guest MSR_TSC_AUX accesses if RDTSCP > unsupported > KVM: SVM: Clear MSR_TSC_AUX[63:32] on write > KVM: x86: Tie Intel and AMD behavior for MSR_TSC_AUX to guest CPU > model > KVM: SVM: Delay restoration of host MSR_TSC_AUX until return to > userspace > > arch/x86/kvm/svm/svm.c | 58 +++++++++++++++++------------------------- > arch/x86/kvm/svm/svm.h | 7 ----- > arch/x86/kvm/vmx/vmx.c | 13 ---------- > arch/x86/kvm/x86.c | 34 +++++++++++++++++++++++++ > 4 files changed, 58 insertions(+), 54 deletions(-) > Queued 1-2-4 (with fix for patch 2). Paolo