[PATCH] kvm: get_msr support for HV_X64_MSR_APIC_ASSIST_PAGE

From: Mike Waychison
Date: Thu Jul 21 2011 - 18:38:31 EST

"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

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@xxxxxxxxxx>
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);
+ return vcpu->arch.hv_vapic;
pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;

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