KVM: vmx: Unavailable DR4/5 is checked before CPL

[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kvm / svm.c

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 7527cefc5a43ac9f24a6b1bea6c1eab43299421f..d4f3aaa2df7c6eb01de4470c8bb432039633e54d 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2999,7 +2999,6 @@ static int dr_interception(struct vcpu_svm *svm)
 {
        int reg, dr;
        unsigned long val;
-       int err;
 
        if (svm->vcpu.guest_debug == 0) {
                /*
@@ -3019,12 +3018,15 @@ static int dr_interception(struct vcpu_svm *svm)
        dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
 
        if (dr >= 16) { /* mov to DRn */
+               if (!kvm_require_dr(&svm->vcpu, dr - 16))
+                       return 1;
                val = kvm_register_read(&svm->vcpu, reg);
                kvm_set_dr(&svm->vcpu, dr - 16, val);
        } else {
-               err = kvm_get_dr(&svm->vcpu, dr, &val);
-               if (!err)
-                       kvm_register_write(&svm->vcpu, reg, val);
+               if (!kvm_require_dr(&svm->vcpu, dr))
+                       return 1;
+               kvm_get_dr(&svm->vcpu, dr, &val);
+               kvm_register_write(&svm->vcpu, reg, val);
        }
 
        skip_emulated_instruction(&svm->vcpu);