check steal time address when enable steal time, do not update arch.st.msr_val if the address is invalid, and return in #GP this can avoid unnecessary write/read invalid memory when guest is running Signed-off-by: Li RongQing <lirongqing@xxxxxxxxx> --- arch/x86/kvm/x86.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index eb402966..3ed0949 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3616,6 +3616,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) if (data & KVM_STEAL_RESERVED_MASK) return 1; + if (!kvm_vcpu_gfn_to_memslot(vcpu, data >> PAGE_SHIFT)) + return 1; + vcpu->arch.st.msr_val = data; if (!(data & KVM_MSR_ENABLED)) -- 2.9.4
