linux-kernel - Re: [PATCH v2] KVM: LAPIC: Advancing the timer expiration on guest initiated write

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Date:   Thu, 11 Mar 2021 11:08:37 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH v2] KVM: LAPIC: Advancing the timer expiration on guest
 initiated write

ping, :)
On Thu, 4 Mar 2021 at 08:35, Wanpeng Li <kernellwp@...il.com> wrote:
>
> From: Wanpeng Li <wanpengli@...cent.com>
>
> Advancing the timer expiration should only be necessary on guest initiated
> writes. When we cancel the timer and clear .pending during state restore,
> clear expired_tscdeadline as well.
>
> Reviewed-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---
> v1 -> v2:
>  * update patch description
>
>  arch/x86/kvm/lapic.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 45d40bf..f2b6e79 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -2595,6 +2595,7 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
>
>         apic_update_ppr(apic);
>         hrtimer_cancel(&apic->lapic_timer.timer);
> +       apic->lapic_timer.expired_tscdeadline = 0;
>         apic_update_lvtt(apic);
>         apic_manage_nmi_watchdog(apic, kvm_lapic_get_reg(apic, APIC_LVT0));
>         update_divide_count(apic);
> --
> 2.7.4
>