KVM: x86: mark hyper-v vapic assist page as dirty

Signed-off-by: Vadim Rozenfeld <vrozenfe@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0fa9c84e36cb..dc11b4f98577 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1869,19 +1869,21 @@ static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 {
         switch (msr) {
         case HV_X64_MSR_APIC_ASSIST_PAGE: {
+                u64 gfn;
                 unsigned long addr;
 
                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
                         vcpu->arch.hv_vapic = data;
                         break;
                 }
-                addr = gfn_to_hva(vcpu->kvm, data >>
-                                  HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
+                gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
+                addr = gfn_to_hva(vcpu->kvm, gfn);
                 if (kvm_is_error_hva(addr))
                         return 1;
                 if (__clear_user((void __user *)addr, PAGE_SIZE))
                         return 1;
                 vcpu->arch.hv_vapic = data;
+                mark_page_dirty(vcpu->kvm, gfn);
                 break;
         }
         case HV_X64_MSR_EOI: