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Subject[PATCH 06/11] KVM: SVM: Implement emulation of vm_cr msr
Date
This patch implements the emulation of the vm_cr msr for
nested svm.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/include/asm/svm.h | 4 ++++
arch/x86/kvm/svm.c | 29 ++++++++++++++++++++++++++++-
2 files changed, 32 insertions(+), 1 deletions(-)
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 38638cd..b26a38d 100644
--- 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 6b7590a..2450a7c 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -70,6 +70,7 @@ struct kvm_vcpu;
struct nested_state {
struct vmcb *hsave;
u64 hsave_msr;
+ u64 vm_cr_msr;
u64 vmcb;

/* These are the merged vectors */
@@ -2273,7 +2274,7 @@ 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;
@@ -2303,6 +2304,31 @@ 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);
@@ -2369,6 +2395,7 @@ 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;
--
1.7.0



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