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KVM: VMX: Fix emulation of DR4 and DR5 

Make sure DR4 and DR5 are aliased to DR6 and DR7, respectively, if
CR4.DE is not set.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2010-01-20 18:20:20 +01:00 committed by Marcelo Tosatti
parent f248341529
commit 138ac8d88f
1 changed files with 26 additions and 9 deletions
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35
arch/x86/kvm/vmx.c
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@ -3039,6 +3039,15 @@ static int handle_cr(struct kvm_vcpu *vcpu)
return 0;
}
static int check_dr_alias(struct kvm_vcpu *vcpu)
{
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return -1;
}
return 0;
}
static int handle_dr(struct kvm_vcpu *vcpu)
{
unsigned long exit_qualification;
@ -3081,14 +3090,20 @@ static int handle_dr(struct kvm_vcpu *vcpu)
case 0 ... 3:
val = vcpu->arch.db[dr];
break;
case 4:
if (check_dr_alias(vcpu) < 0)
return 1;
/* fall through */
case 6:
val = vcpu->arch.dr6;
break;
case 7:
case 5:
if (check_dr_alias(vcpu) < 0)
return 1;
/* fall through */
default: /* 7 */
val = vcpu->arch.dr7;
break;
default:
val = 0;
}
kvm_register_write(vcpu, reg, val);
} else {
@ -3099,12 +3114,10 @@ static int handle_dr(struct kvm_vcpu *vcpu)
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
vcpu->arch.eff_db[dr] = val;
break;
case 4 ... 5:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
case 4:
if (check_dr_alias(vcpu) < 0)
return 1;
}
break;
/* fall through */
case 6:
if (val & 0xffffffff00000000ULL) {
kvm_inject_gp(vcpu, 0);
@ -3112,7 +3125,11 @@ static int handle_dr(struct kvm_vcpu *vcpu)
}
vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
break;
case 7:
case 5:
if (check_dr_alias(vcpu) < 0)
return 1;
/* fall through */
default: /* 7 */
if (val & 0xffffffff00000000ULL) {
kvm_inject_gp(vcpu, 0);
return 1;