KVM: SVM: handle errors in vmrun emulation path appropriatly

If nested svm fails to load the msrpm the vmrun succeeds with the old
msrpm which is not correct. This patch changes the logic to roll back
to host mode in case the msrpm cannot be loaded.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d458297d54c8096aba4716f522d789604e75a702..53376f144d7072a30bdb00f31b3ab6ad24e17fad 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1874,6 +1874,7 @@ static int vmsave_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 static int vmrun_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 {
        nsvm_printk("VMrun\n");
+
        if (nested_svm_check_permissions(svm))
                return 1;
 
@@ -1884,7 +1885,18 @@ static int vmrun_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
                return 1;
 
        if (!nested_svm_vmrun_msrpm(svm))
-               return 1;
+               goto failed;
+
+       return 1;
+
+failed:
+
+       svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
+       svm->vmcb->control.exit_code_hi = 0;
+       svm->vmcb->control.exit_info_1  = 0;
+       svm->vmcb->control.exit_info_2  = 0;
+
+       nested_svm_vmexit(svm);
 
        return 1;
 }