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[RFC,5/7] KVM: timer: ignore timer migration if pvtimer is enabled

Message ID 1512722390-3654-6-git-send-email-quan.xu0@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Quan Xu Dec. 8, 2017, 8:39 a.m. UTC 
From: Ben Luo <bn0418@gmail.com>

When pvtimer is enabled, KVM programs timer to a dedicated CPU
through IPI. Whether the vCPU is on the dedicated CPU or any
other CPU, the timer interrupt will be delivered properly.
No need to migrate timer.

Signed-off-by: Yang Zhang <yang.zhang.wz@gmail.com>
Signed-off-by: Quan Xu <quan.xu0@gmail.com>
Signed-off-by: Ben Luo <bn0418@gmail.com>
---
 arch/x86/kvm/lapic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 5835a27..265efe6 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2282,7 +2282,7 @@  void __kvm_migrate_apic_timer(struct kvm_vcpu *vcpu)
 {
 	struct hrtimer *timer;
 
-	if (!lapic_in_kernel(vcpu))
+	if (!lapic_in_kernel(vcpu) || pv_timer_enabled(vcpu))
 		return;
 
 	timer = &vcpu->arch.apic->lapic_timer.timer;