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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: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Markus Rechberger <markus.rechberger@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Joerg Roedel 2007-12-06 15:46:52 +01:00 committed by Avi Kivity
parent e5314067f6
commit 152ff9be2e
1 changed files with 5 additions and 0 deletions
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5
drivers/kvm/x86.c
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@ -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);
}