linux-kernel - [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned

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Date:   Tue, 30 Aug 2016 16:14:01 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Wanpeng Li <wanpeng.li@...mail.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Yunhong Jiang <yunhong.jiang@...el.com>
Subject: [PATCH 2/2] KVM: nVMX: make emulated nested preemption timer pinned

From: Wanpeng Li <wanpeng.li@...mail.com>

Commit 61abdbe0bc ("kvm: x86: make lapic hrtimer pinned") pins the emulated 
lapic timer. This patch does the same for the emulated nested preemption 
timer to avoid vmexit an unrelated vCPU and the latency of kicking IPI to 
another vCPU.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Yunhong Jiang <yunhong.jiang@...el.com>
Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
---
 arch/x86/kvm/vmx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5cede40..090a3f8 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -7013,7 +7013,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
 	vmx->nested.vmcs02_num = 0;
 
 	hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC,
-		     HRTIMER_MODE_REL);
+		     HRTIMER_MODE_REL_PINNED);
 	vmx->nested.preemption_timer.function = vmx_preemption_timer_fn;
 
 	vmx->nested.vmxon = true;
-- 
1.9.1