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KVM: x86: make double/triple fault promotion generic to all exceptions 

Move Double-Fault generation logic out of page fault
exception generating function to cover more generic case.

Signed-off-by: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Eddie Dong 2009-11-19 17:54:07 +02:00 committed by Marcelo Tosatti
parent 30ff056c42
commit 3fd28fce76
1 changed files with 61 additions and 28 deletions
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89
arch/x86/kvm/x86.c
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@ -257,12 +257,68 @@ void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
}
EXPORT_SYMBOL_GPL(kvm_set_apic_base);
#define EXCPT_BENIGN 0
#define EXCPT_CONTRIBUTORY 1
#define EXCPT_PF 2
static int exception_class(int vector)
{
switch (vector) {
case PF_VECTOR:
return EXCPT_PF;
case DE_VECTOR:
case TS_VECTOR:
case NP_VECTOR:
case SS_VECTOR:
case GP_VECTOR:
return EXCPT_CONTRIBUTORY;
default:
break;
}
return EXCPT_BENIGN;
}
static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
unsigned nr, bool has_error, u32 error_code)
{
u32 prev_nr;
int class1, class2;
if (!vcpu->arch.exception.pending) {
queue:
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = has_error;
vcpu->arch.exception.nr = nr;
vcpu->arch.exception.error_code = error_code;
return;
}
/* to check exception */
prev_nr = vcpu->arch.exception.nr;
if (prev_nr == DF_VECTOR) {
/* triple fault -> shutdown */
set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
return;
}
class1 = exception_class(prev_nr);
class2 = exception_class(nr);
if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
|| (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
/* generate double fault per SDM Table 5-5 */
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = true;
vcpu->arch.exception.nr = DF_VECTOR;
vcpu->arch.exception.error_code = 0;
} else
/* replace previous exception with a new one in a hope
that instruction re-execution will regenerate lost
exception */
goto queue;
}
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
WARN_ON(vcpu->arch.exception.pending);
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = false;
vcpu->arch.exception.nr = nr;
kvm_multiple_exception(vcpu, nr, false, 0);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception);
@ -270,25 +326,6 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
u32 error_code)
{
++vcpu->stat.pf_guest;
if (vcpu->arch.exception.pending) {
switch(vcpu->arch.exception.nr) {
case DF_VECTOR:
/* triple fault -> shutdown */
set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
return;
case PF_VECTOR:
vcpu->arch.exception.nr = DF_VECTOR;
vcpu->arch.exception.error_code = 0;
return;
default:
/* replace previous exception with a new one in a hope
that instruction re-execution will regenerate lost
exception */
vcpu->arch.exception.pending = false;
break;
}
}
vcpu->arch.cr2 = addr;
kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
}
@ -301,11 +338,7 @@ EXPORT_SYMBOL_GPL(kvm_inject_nmi);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
WARN_ON(vcpu->arch.exception.pending);
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = true;
vcpu->arch.exception.nr = nr;
vcpu->arch.exception.error_code = error_code;
kvm_multiple_exception(vcpu, nr, true, error_code);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception_e);