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Commit 4a810181 authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
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KVM: SVM: Implement emulation of vm_cr msr 



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

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 2e554e8d

arch/x86/include/asm/svm.h

+4 −0
Original line number Diff line number Diff line
@@ -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;

arch/x86/kvm/svm.c

+28 −1
Original line number Diff line number Diff line
@@ -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;