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Message-ID: <d2820bafeea6e908108bac863269a7ff7f519999.camel@redhat.com>
Date: Mon, 18 Apr 2022 11:37:48 +0300
From: Maxim Levitsky <mlevitsk@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>
Cc: Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, Gaoning Pan <pgn@....edu.cn>,
Yongkang Jia <kangel@....edu.cn>
Subject: Re: [PATCH 1/4] KVM: x86: Tag APICv DISABLE inhibit, not ABSENT, if
APICv is disabled
On Sat, 2022-04-16 at 03:42 +0000, Sean Christopherson wrote:
> Set the DISABLE inhibit, not the ABSENT inhibit, if APICv is disabled via
> module param. A recent refactoring to add a wrapper for setting/clearing
> inhibits unintentionally changed the flag, probably due to a copy+paste
> goof.
>
> Fixes: 4f4c4a3ee53c ("KVM: x86: Trace all APICv inhibit changes and capture overall status")
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
> arch/x86/kvm/x86.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index ab336f7c82e4..753296902535 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -9159,7 +9159,7 @@ static void kvm_apicv_init(struct kvm *kvm)
>
> if (!enable_apicv)
> set_or_clear_apicv_inhibit(inhibits,
> - APICV_INHIBIT_REASON_ABSENT, true);
> + APICV_INHIBIT_REASON_DISABLE, true);
> }
>
> static void kvm_sched_yield(struct kvm_vcpu *vcpu, unsigned long dest_id)
So ABSENT means that userspace didn't enable, it and DISABLE means kernel module param disabled it.
I didn't follow patches that touched those but it feels like we can use a single inhibit reason for both,
or at least make better names for this. APICV_INHIBIT_REASON_ABSENT doesn't sound good to me.
Having said that, the patch is OK.
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>
Best regards,
Maxim Levitsky
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