linux-kernel - [KVM timekeeping 22/35] Track tsc last write in vcpu

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Date:	Thu, 19 Aug 2010 22:07:36 -1000
From:	Zachary Amsden <zamsden@...hat.com>
To:	kvm@...r.kernel.org
Cc:	Zachary Amsden <zamsden@...hat.com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Glauber Costa <glommer@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: [KVM timekeeping 22/35] Track tsc last write in vcpu

Reason becomes apparent soon; this is an easy to digest step.

Signed-off-by: Zachary Amsden <zamsden@...hat.com>
---
 arch/x86/include/asm/kvm_host.h |    2 ++
 arch/x86/kvm/x86.c              |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 871800d..638cae5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -341,6 +341,8 @@ struct kvm_vcpu_arch {
 	u64 last_host_tsc;
 	u64 last_guest_tsc;
 	u64 last_kernel_ns;
+	u64 last_tsc_nsec;
+	u64 last_tsc_write;
 
 	bool nmi_pending;
 	bool nmi_injected;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 517daf3..3691e70 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -962,6 +962,8 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
 
 	/* Reset of TSC must disable overshoot protection below */
 	vcpu->arch.hv_clock.tsc_timestamp = 0;
+	vcpu->arch.last_tsc_write = data;
+	vcpu->arch.last_tsc_nsec = ns;
 }
 EXPORT_SYMBOL_GPL(kvm_write_tsc);
 
-- 
1.7.1

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