[PATCH] x86: emulate read/write access to cr8

["Joerg Roedel" <joerg.roedel-5C7GfCeVMHo@public.gmane.org>]

From: Joerg Roedel <jroedel-Ug2OvFXVNAT2eFz/2MeuCQ@public.gmane.org>

This patch adds code to emulate the access to the cr8 register to the x86
instruction emulator in kvm.

Signed-off-by: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
Signed-off-by: Markus Rechberger <markus.rechberger-5C7GfCeVMHo@public.gmane.org>
---
 drivers/kvm/x86.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index 6deb052..9db4e32 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -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);
 	}
-- 
1.5.2.5




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