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KVM: x86 emulator: make (get|set)_dr() callback return error if it fails 

Make (get|set)_dr() callback return error if it fails instead of
injecting exception behind emulator's back.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2010-04-28 19:15:32 +03:00 committed by Avi Kivity
parent 0f12244fe7
commit 338dbc9781
2 changed files with 45 additions and 29 deletions
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11
arch/x86/kvm/emulate.c
View File

@ -3151,9 +3151,14 @@ twobyte_insn:
goto done;
}
ops->set_dr(c->modrm_reg,c->regs[c->modrm_rm] &
((ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U),
ctxt->vcpu);
if (ops->set_dr(c->modrm_reg, c->regs[c->modrm_rm] &
((ctxt->mode == X86EMUL_MODE_PROT64) ?
~0ULL : ~0U), ctxt->vcpu) < 0) {
/* #UD condition is already handled by the code above */
kvm_inject_gp(ctxt->vcpu, 0);
goto done;
}
c->dst.type = OP_NONE; /* no writeback */
break;
case 0x30:

63
arch/x86/kvm/x86.c
View File

@ -573,7 +573,7 @@ unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_get_cr8);
int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
{
switch (dr) {
case 0 ... 3:
@ -582,29 +582,21 @@ int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
vcpu->arch.eff_db[dr] = val;
break;
case 4:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1; /* #UD */
/* fall through */
case 6:
if (val & 0xffffffff00000000ULL) {
kvm_inject_gp(vcpu, 0);
return 1;
}
if (val & 0xffffffff00000000ULL)
return -1; /* #GP */
vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
break;
case 5:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1; /* #UD */
/* fall through */
default: /* 7 */
if (val & 0xffffffff00000000ULL) {
kvm_inject_gp(vcpu, 0);
return 1;
}
if (val & 0xffffffff00000000ULL)
return -1; /* #GP */
vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
@ -615,28 +607,37 @@ int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
return 0;
}
int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
{
int res;
res = __kvm_set_dr(vcpu, dr, val);
if (res > 0)
kvm_queue_exception(vcpu, UD_VECTOR);
else if (res < 0)
kvm_inject_gp(vcpu, 0);
return res;
}
EXPORT_SYMBOL_GPL(kvm_set_dr);
int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
{
switch (dr) {
case 0 ... 3:
*val = vcpu->arch.db[dr];
break;
case 4:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1;
}
/* fall through */
case 6:
*val = vcpu->arch.dr6;
break;
case 5:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE)) {
kvm_queue_exception(vcpu, UD_VECTOR);
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1;
}
/* fall through */
default: /* 7 */
*val = vcpu->arch.dr7;
@ -645,6 +646,15 @@ int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
return 0;
}
int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
{
if (_kvm_get_dr(vcpu, dr, val)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_dr);
static inline u32 bit(int bitno)
@ -3619,12 +3629,13 @@ int emulate_clts(struct kvm_vcpu *vcpu)
int emulator_get_dr(int dr, unsigned long *dest, struct kvm_vcpu *vcpu)
{
return kvm_get_dr(vcpu, dr, dest);
return _kvm_get_dr(vcpu, dr, dest);
}
int emulator_set_dr(int dr, unsigned long value, struct kvm_vcpu *vcpu)
{
return kvm_set_dr(vcpu, dr, value);
return __kvm_set_dr(vcpu, dr, value);
}
void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)