linux-kernel - [PATCH 5.18 655/879] KVM: LAPIC: Drop pending LAPIC timer injection when canceling the timer

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Date:   Tue,  7 Jun 2022 19:02:53 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wanpeng Li <wanpengli@...cent.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 655/879] KVM: LAPIC: Drop pending LAPIC timer injection when canceling the timer

From: Wanpeng Li <wanpengli@...cent.com>

[ Upstream commit 619f51da097952194a5d4d6a6c5f9ef3b9d1b25a ]

The timer is disarmed when switching between TSC deadline and other modes;
however, the pending timer is still in-flight, so let's accurately remove
any traces of the previous mode.

Fixes: 4427593258 ("KVM: x86: thoroughly disarm LAPIC timer around TSC deadline switch")
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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..6268880c8eed 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1548,6 +1548,7 @@ static void cancel_apic_timer(struct kvm_lapic *apic)
 	if (apic->lapic_timer.hv_timer_in_use)
 		cancel_hv_timer(apic);
 	preempt_enable();
+	atomic_set(&apic->lapic_timer.pending, 0);
 }
 
 static void apic_update_lvtt(struct kvm_lapic *apic)
-- 
2.35.1