diff options
Diffstat (limited to 'arch/x86/kvm/hyperv.c')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index d9b7b4cd4e43..4e80080f277a 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1104,7 +1104,13 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host) addr = kvm_vcpu_gfn_to_hva(vcpu, gfn); if (kvm_is_error_hva(addr)) return 1; - if (__clear_user((void __user *)addr, PAGE_SIZE)) + + /* + * Clear apic_assist portion of f(struct hv_vp_assist_page + * only, there can be valuable data in the rest which needs + * to be preserved e.g. on migration. + */ + if (__clear_user((void __user *)addr, sizeof(u32))) return 1; hv_vcpu->hv_vapic = data; kvm_vcpu_mark_page_dirty(vcpu, gfn); |