linux-kernel - Re: [PATCH 06/10] KVM: SVM: tweak warning about enabled AVIC on nested entry

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Date:   Wed, 23 Jun 2021 23:52:53 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, kvm@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH 06/10] KVM: SVM: tweak warning about enabled AVIC on
 nested entry

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 <mlevitsk@...hat.com>
> ---
>   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