KVM: SVM: Add intercept check for accessing dr registers

This patch adds the intercept checks for instruction
accessing the debug registers.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index ff4ed3619d00..381b038c0d01 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3882,6 +3882,8 @@ static struct __x86_intercept {
         [x86_intercept_clts]            = POST_EX(SVM_EXIT_WRITE_CR0),
         [x86_intercept_lmsw]            = POST_EX(SVM_EXIT_WRITE_CR0),
         [x86_intercept_smsw]            = POST_EX(SVM_EXIT_READ_CR0),
+        [x86_intercept_dr_read]         = POST_EX(SVM_EXIT_READ_DR0),
+        [x86_intercept_dr_write]        = POST_EX(SVM_EXIT_WRITE_DR0),
 };
 
 #undef POST_EX
@@ -3939,6 +3941,10 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
 
                 break;
         }
+        case SVM_EXIT_READ_DR0:
+        case SVM_EXIT_WRITE_DR0:
+                icpt_info.exit_code += info->modrm_reg;
+                break;
         default:
                 break;
         }