linux-kernel - Re: [PATCH v2 2/2] KVM: LAPIC: Guarantee the timer is in tsc-deadline mode when setting

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Message-ID: <CANRm+CzzJuffAfcR9KyZ6Yv1sSQJyM+H2V19=OuU=jJON6iVXQ@mail.gmail.com>
Date:   Mon, 24 Aug 2020 09:04:37 +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 <sean.j.christopherson@...el.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 2/2] KVM: LAPIC: Guarantee the timer is in tsc-deadline
 mode when setting

ping :)
On Wed, 12 Aug 2020 at 14:30, Wanpeng Li <kernellwp@...il.com> wrote:
>
> From: Wanpeng Li <wanpengli@...cent.com>
>
> Check apic_lvtt_tscdeadline() mode directly instead of apic_lvtt_oneshot()
> and apic_lvtt_period() to guarantee the timer is in tsc-deadline mode when
> wrmsr MSR_IA32_TSCDEADLINE.
>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> ---
> v1 -> v2:
>  * fix indentation
>
>  arch/x86/kvm/lapic.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 79599af..abaf48e 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -2193,8 +2193,7 @@ void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data)
>  {
>         struct kvm_lapic *apic = vcpu->arch.apic;
>
> -       if (!kvm_apic_present(vcpu) || apic_lvtt_oneshot(apic) ||
> -                       apic_lvtt_period(apic))
> +       if (!kvm_apic_present(vcpu) || !apic_lvtt_tscdeadline(apic))
>                 return;
>
>         hrtimer_cancel(&apic->lapic_timer.timer);
> --
> 2.7.4
>