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-rw-r--r--arch/x86/kvm/svm/svm.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 91352d692845..6ffadbd57744 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3895,8 +3895,14 @@ static int svm_vcpu_pre_run(struct kvm_vcpu *vcpu)
static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
- if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
- to_svm(vcpu)->vmcb->control.exit_info_1)
+ struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
+
+ /*
+ * Note, the next RIP must be provided as SRCU isn't held, i.e. KVM
+ * can't read guest memory (dereference memslots) to decode the WRMSR.
+ */
+ if (control->exit_code == SVM_EXIT_MSR && control->exit_info_1 &&
+ nrips && control->next_rip)
return handle_fastpath_set_msr_irqoff(vcpu);
return EXIT_FASTPATH_NONE;