KVM: SVM: Implement emulation of vm_cr msr

This patch implements the emulation of the vm_cr msr for
nested svm.

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

diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 38638cd..b26a38d 100644 (file)
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -115,6 +115,10 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
 #define SVM_IOIO_SIZE_MASK (7 << SVM_IOIO_SIZE_SHIFT)
 #define SVM_IOIO_ASIZE_MASK (7 << SVM_IOIO_ASIZE_SHIFT)
 
+#define SVM_VM_CR_VALID_MASK   0x001fULL
+#define SVM_VM_CR_SVM_LOCK_MASK 0x0008ULL
+#define SVM_VM_CR_SVM_DIS_MASK  0x0010ULL
+
 struct __attribute__ ((__packed__)) vmcb_seg {
        u16 selector;
        u16 attrib;

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index cac761c..b4aac5c 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -71,6 +71,7 @@ struct kvm_vcpu;
 struct nested_state {
        struct vmcb *hsave;
        u64 hsave_msr;
+       u64 vm_cr_msr;
        u64 vmcb;
 
        /* These are the merged vectors */
@@ -2280,7 +2281,7 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
                *data = svm->nested.hsave_msr;
                break;
        case MSR_VM_CR:
-               *data = 0;
+               *data = svm->nested.vm_cr_msr;
                break;
        case MSR_IA32_UCODE_REV:
                *data = 0x01000065;
@@ -2310,6 +2311,31 @@ static int rdmsr_interception(struct vcpu_svm *svm)
        return 1;
 }
 
+static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
+{
+       struct vcpu_svm *svm = to_svm(vcpu);
+       int svm_dis, chg_mask;
+
+       if (data & ~SVM_VM_CR_VALID_MASK)
+               return 1;
+
+       chg_mask = SVM_VM_CR_VALID_MASK;
+
+       if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
+               chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);
+
+       svm->nested.vm_cr_msr &= ~chg_mask;
+       svm->nested.vm_cr_msr |= (data & chg_mask);
+
+       svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;
+
+       /* check for svm_disable while efer.svme is set */
+       if (svm_dis && (vcpu->arch.efer & EFER_SVME))
+               return 1;
+
+       return 0;
+}
+
 static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
 {
        struct vcpu_svm *svm = to_svm(vcpu);
@@ -2376,6 +2402,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
                svm->nested.hsave_msr = data;
                break;
        case MSR_VM_CR:
+               return svm_set_vm_cr(vcpu, data);
        case MSR_VM_IGNNE:
                pr_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
                break;