From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: [PATCH] KVM: LAPIC: Disarm LAPIC timer includes pending timer around TSC deadline switch
Date: Tue, 10 May 2022 02:36:26 -0700 [thread overview]
Message-ID: <1652175386-31587-1-git-send-email-wanpengli@tencent.com> (raw)
From: Wanpeng Li <wanpengli@tencent.com>
The timer is disarmed when switching between TSC deadline and other modes,
however, the pending timer is still in-flight, so let's accurately set
everything to a disarmed state.
Fixes: 4427593258 (KVM: x86: thoroughly disarm LAPIC timer around TSC deadline switch)
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
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 66b0eb0bda94..0274d17d91c2 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1562,6 +1562,7 @@ static void apic_update_lvtt(struct kvm_lapic *apic)
kvm_lapic_set_reg(apic, APIC_TMICT, 0);
apic->lapic_timer.period = 0;
apic->lapic_timer.tscdeadline = 0;
+ atomic_set(&apic->lapic_timer.pending, 0);
}
apic->lapic_timer.timer_mode = timer_mode;
limit_periodic_timer_frequency(apic);
--
2.25.1
next reply other threads:[~2022-05-10 9:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-10 9:36 Wanpeng Li [this message]
2022-05-10 13:43 ` [PATCH] KVM: LAPIC: Disarm LAPIC timer includes pending timer around TSC deadline switch Sean Christopherson
2022-05-11 2:42 ` Wanpeng Li
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