linux-kernel - [PATCH 12/16] KVM-HV: KVM Steal time implementation

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Message-Id: <1295892397-11354-13-git-send-email-glommer@redhat.com>
Date:	Mon, 24 Jan 2011 13:06:33 -0500
From:	Glauber Costa <glommer@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, aliguori@...ibm.com,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Avi Kivity <avi@...hat.com>
Subject: [PATCH 12/16] KVM-HV: KVM Steal time implementation

To implement steal time, we need the hypervisor to pass the guest information
about how much time was spent running other processes outside the VM.
This is per-vcpu, and using the kvmclock structure for that is an abuse
we decided not to make.

This patch contains the hypervisor part for it. I am keeping it separate from
the headers to facilitate backports to people who wants to backport the kernel
part but not the hypervisor, or the other way around.

Signed-off-by: Glauber Costa <glommer@...hat.com>
CC: Rik van Riel <riel@...hat.com>
CC: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Avi Kivity <avi@...hat.com>
---
 arch/x86/kvm/x86.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 81b2f34..f129ea1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1564,6 +1564,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 			goto rma_out;
 		}
 
+		if (area_desc.type == KVM_AREA_STEAL_TIME) {
+			vcpu->arch.stime = area_desc.base;
+			goto rma_out;
+		}
+
 		if (vcpu->kvm->register_mem_area_uspace) {
 			vcpu->run->exit_reason = KVM_EXIT_X86_MSR_OP;
 			vcpu->run->msr.msr_data = data;
-- 
1.7.2.3

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