linux-kernel - [PATCH] kvm: get_msr support for HV_X64_MSR_APIC_ASSIST

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Date:	Thu, 21 Jul 2011 15:38:10 -0700
From:	Mike Waychison <mikew@...gle.com>
To:	Cory Maccarrone <maccarro@...gle.com>,
	Andy Thornton <andrewth@...gle.com>,
	Miche Baker-Harvey <miche@...gle.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mike Waychison <mikew@...gle.com>
Subject: [PATCH] kvm: get_msr support for HV_X64_MSR_APIC_ASSIST_PAGE

"get" support for the HV_X64_MSR_APIC_ASSIST_PAGE msr was missing, even
though it is explicitly enumerated as something the vmm should save in
msrs_to_save and reported to userland via the KVM_GET_MSR_INDEX_LIST
ioctl.

Add "get" support for HV_X64_MSR_APIC_ASSIST_PAGE.  We simply return the
guest visible value of this register, which seems to be correct as a set
on the register is validated for us already.

Signed-off-by: Mike Waychison <mikew@...gle.com>
---
 arch/x86/kvm/x86.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 77c9d86..15148ef 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1748,6 +1748,8 @@ static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 		return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
 	case HV_X64_MSR_TPR:
 		return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
+	case HV_X64_MSR_APIC_ASSIST_PAGE:
+		return vcpu->arch.hv_vapic;
 	default:
 		pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
 		return 1;
-- 
1.7.3.1

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