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>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0fa9c84..dc11b4f 100644 (file)
--- 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: