linux-kernel - Re: [PATCH] KVM: SVM: fix calculate dest mask incorrectly in x2apic mode.

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Message-ID: <Y9vewvcdjKkaFS87@google.com>
Date:   Thu, 2 Feb 2023 16:03:14 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
Cc:     pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, mlevitsk@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: SVM: fix calculate dest mask incorrectly in x2apic
 mode.

On Thu, Feb 02, 2023, Yuan ZhaoXiong wrote:
> ICRH bits 31:16 is cluster id and bits 15:0 is dest mask when x2apic is
> enabled.
> 
> Fixes: 603ccef42ce9 ("KVM: x86: SVM: fix avic_kick_target_vcpus_fast")
> 
> Signed-off-by: Yuan ZhaoXiong <yuanzhaoxiong@...du.com>
> ---
>  arch/x86/kvm/svm/avic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index 6919dee..03b1e27 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -378,7 +378,7 @@ static int avic_kick_target_vcpus_fast(struct kvm *kvm, struct kvm_lapic *source
>  
>  		if (apic_x2apic_mode(source)) {
>  			/* 16 bit dest mask, 16 bit cluster id */
> -			bitmap = dest & 0xFFFF0000;
> +			bitmap = dest & 0xFFFF;

Already fixed in the Paolo's tree, commit da3fb46d226a ("KVM: SVM: Fix x2APIC
Logical ID calculation for avic_kick_target_vcpus_fast").

In case you have more APIC/AVIC related fixes/bugs, a big pile of fixes are queued
for 6.3, see commit f15a87c00690 ("Merge branch 'kvm-lapic-fix-and-cleanup' into HEAD").

Thanks!