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Commit 152ff9be authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
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KVM: SVM: Emulate read/write access to cr8 



This patch adds code to emulate the access to the cr8 register to the x86
instruction emulator in kvm.  This is needed on svm, where there is no
hardware decode for control register access.

Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarMarkus Rechberger <markus.rechberger@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent e5314067

drivers/kvm/x86.c

+5 −0
Original line number Diff line number Diff line
@@ -2236,6 +2236,8 @@ unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) 
		return vcpu->cr3;

	case 4:

		return vcpu->cr4;

	case 8:

		return get_cr8(vcpu);

	default:

		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);

		return 0;
@@ -2259,6 +2261,9 @@ void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, 
	case 4:

		set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));

		break;

	case 8:

		set_cr8(vcpu, val & 0xfUL);

		break;

	default:

		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);

	}