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Diffstat (limited to 'arch/x86/kvm/hyperv.c')
-rw-r--r--arch/x86/kvm/hyperv.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index ebae57ac5902..a8084406707e 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -221,7 +221,8 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
synic->version = data;
break;
case HV_X64_MSR_SIEFP:
- if (data & HV_SYNIC_SIEFP_ENABLE)
+ if ((data & HV_SYNIC_SIEFP_ENABLE) && !host &&
+ !synic->dont_zero_synic_pages)
if (kvm_clear_guest(vcpu->kvm,
data & PAGE_MASK, PAGE_SIZE)) {
ret = 1;
@@ -232,7 +233,8 @@ static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
synic_exit(synic, msr);
break;
case HV_X64_MSR_SIMP:
- if (data & HV_SYNIC_SIMP_ENABLE)
+ if ((data & HV_SYNIC_SIMP_ENABLE) && !host &&
+ !synic->dont_zero_synic_pages)
if (kvm_clear_guest(vcpu->kvm,
data & PAGE_MASK, PAGE_SIZE)) {
ret = 1;
@@ -687,14 +689,17 @@ void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
stimer_init(&hv_vcpu->stimer[i], i);
}
-int kvm_hv_activate_synic(struct kvm_vcpu *vcpu)
+int kvm_hv_activate_synic(struct kvm_vcpu *vcpu, bool dont_zero_synic_pages)
{
+ struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
+
/*
* Hyper-V SynIC auto EOI SINT's are
* not compatible with APICV, so deactivate APICV
*/
kvm_vcpu_deactivate_apicv(vcpu);
- vcpu_to_synic(vcpu)->active = true;
+ synic->active = true;
+ synic->dont_zero_synic_pages = dont_zero_synic_pages;
return 0;
}

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