linux-kernel - [PATCH 05/16] KVM-HDR: Implement wallclock over KVM

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Date:	Mon, 24 Jan 2011 13:06:26 -0500
From:	Glauber Costa <glommer@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, aliguori@...ibm.com,
	Avi Kivity <avi@...hat.com>
Subject: [PATCH 05/16] KVM-HDR: Implement wallclock over KVM - KVM Virtual Memory

As a proof of concept to KVM - Kernel Virtual Memory, this patch
implements wallclock grabbing on top of it. At first, it may seem
as a waste of work to just redo it, since it is working well. But over the
time, other MSRs were added - think ASYNC_PF - and more will probably come.
After this patch, we won't need to ever add another virtual MSR to KVM.

If the hypervisor fails to register the memory area, we switch back to legacy
behavior on things that were already present - like kvm clock.

This patch contains the headers for it. I am keeping it separate 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: Avi Kivity <avi@...hat.com>
---
 arch/x86/include/asm/kvm_para.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index b0b0ee0..de088c8 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -46,6 +46,8 @@ struct kvm_memory_area {
 	__u8  pad[3];
 };

+#define KVM_AREA_WALLCLOCK		1
+
 #define KVM_MAX_MMU_OP_BATCH           32

 #define KVM_ASYNC_PF_ENABLED			(1 << 0)
-- 
1.7.2.3

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