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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id d22sm391752ejj.47.2021.06.23.14.52.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 23 Jun 2021 14:52:54 -0700 (PDT) Subject: Re: [PATCH 06/10] KVM: SVM: tweak warning about enabled AVIC on nested entry To: Maxim Levitsky , kvm@vger.kernel.org Cc: Thomas Gleixner , Sean Christopherson , Wanpeng Li , Vitaly Kuznetsov , Joerg Roedel , Borislav Petkov , "H. Peter Anvin" , Ingo Molnar , "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , Jim Mattson References: <20210623113002.111448-1-mlevitsk@redhat.com> <20210623113002.111448-7-mlevitsk@redhat.com> From: Paolo Bonzini Message-ID: <30c057c7-3c42-90cd-0beb-a4c7fdff39ea@redhat.com> Date: Wed, 23 Jun 2021 23:52:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: <20210623113002.111448-7-mlevitsk@redhat.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: kvm@vger.kernel.org On 23/06/21 13:29, Maxim Levitsky wrote: > It is possible that AVIC was requested to be disabled but > not yet disabled, e.g if the nested entry is done right > after svm_vcpu_after_set_cpuid. > > Signed-off-by: Maxim Levitsky > --- > arch/x86/kvm/svm/nested.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c > index dca20f949b63..253847f7d9aa 100644 > --- a/arch/x86/kvm/svm/nested.c > +++ b/arch/x86/kvm/svm/nested.c > @@ -505,7 +505,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) > * Also covers avic_vapic_bar, avic_backing_page, avic_logical_id, > * avic_physical_id. > */ > - WARN_ON(svm->vmcb01.ptr->control.int_ctl & AVIC_ENABLE_MASK); > + WARN_ON(kvm_apicv_activated(svm->vcpu.kvm)); > > /* Copied from vmcb01. msrpm_base can be overwritten later. */ > svm->vmcb->control.nested_ctl = svm->vmcb01.ptr->control.nested_ctl; > Queued, thanks. Paolo