KVM: SVM: Add support for CR0 write traps for an SEV-ES guest

[linux-2.6-microblaze.git] / arch / x86 / kvm / svm / svm.c

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 983b993..ddcb739 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2450,6 +2450,31 @@ static int cr_interception(struct vcpu_svm *svm)
        return kvm_complete_insn_gp(&svm->vcpu, err);
 }
 
+static int cr_trap(struct vcpu_svm *svm)
+{
+       struct kvm_vcpu *vcpu = &svm->vcpu;
+       unsigned long old_value, new_value;
+       unsigned int cr;
+
+       new_value = (unsigned long)svm->vmcb->control.exit_info_1;
+
+       cr = svm->vmcb->control.exit_code - SVM_EXIT_CR0_WRITE_TRAP;
+       switch (cr) {
+       case 0:
+               old_value = kvm_read_cr0(vcpu);
+               svm_set_cr0(vcpu, new_value);
+
+               kvm_post_set_cr0(vcpu, old_value, new_value);
+               break;
+       default:
+               WARN(1, "unhandled CR%d write trap", cr);
+               kvm_queue_exception(vcpu, UD_VECTOR);
+               return 1;
+       }
+
+       return kvm_complete_insn_gp(vcpu, 0);
+}
+
 static int dr_interception(struct vcpu_svm *svm)
 {
        int reg, dr;
@@ -2997,6 +3022,7 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
        [SVM_EXIT_XSETBV]                       = xsetbv_interception,
        [SVM_EXIT_RDPRU]                        = rdpru_interception,
        [SVM_EXIT_EFER_WRITE_TRAP]              = efer_trap,
+       [SVM_EXIT_CR0_WRITE_TRAP]               = cr_trap,
        [SVM_EXIT_INVPCID]                      = invpcid_interception,
        [SVM_EXIT_NPF]                          = npf_interception,
        [SVM_EXIT_RSM]                          = rsm_interception,