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KVM: APIC: remove unnecessary double checks on APIC existence 

Usually the in-kernel APIC's existence is checked in the caller.  Do not
bother checking it again in lapic.c.

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-01-08 13:42:24 +01:00
parent b6ce978067
commit f8543d6a97
1 changed files with 3 additions and 16 deletions
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19
arch/x86/kvm/lapic.c
View File

@ -475,18 +475,12 @@ static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
int kvm_lapic_find_highest_irr(struct kvm_vcpu *vcpu)
{
int highest_irr;
/* This may race with setting of irr in __apic_accept_irq() and
* value returned may be wrong, but kvm_vcpu_kick() in __apic_accept_irq
* will cause vmexit immediately and the value will be recalculated
* on the next vmentry.
*/
if (!kvm_vcpu_has_lapic(vcpu))
return 0;
highest_irr = apic_find_highest_irr(vcpu->arch.apic);
return highest_irr;
return apic_find_highest_irr(vcpu->arch.apic);
}
static int __apic_accept_irq(struct kvm_lapic *apic, int delivery_mode,
@ -1601,8 +1595,7 @@ static int apic_mmio_write(struct kvm_vcpu *vcpu, struct kvm_io_device *this,
void kvm_lapic_set_eoi(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_has_lapic(vcpu))
apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
apic_reg_write(vcpu->arch.apic, APIC_EOI, 0);
}
EXPORT_SYMBOL_GPL(kvm_lapic_set_eoi);
@ -1676,9 +1669,6 @@ void kvm_lapic_set_tpr(struct kvm_vcpu *vcpu, unsigned long cr8)
{
struct kvm_lapic *apic = vcpu->arch.apic;
if (!kvm_vcpu_has_lapic(vcpu))
return;
apic_set_tpr(apic, ((cr8 & 0x0f) << 4)
| (kvm_apic_get_reg(apic, APIC_TASKPRI) & 4));
}
@ -1687,9 +1677,6 @@ u64 kvm_lapic_get_cr8(struct kvm_vcpu *vcpu)
{
u64 tpr;
if (!kvm_vcpu_has_lapic(vcpu))
return 0;
tpr = (u64) kvm_apic_get_reg(vcpu->arch.apic, APIC_TASKPRI);
return (tpr & 0xf0) >> 4;
@ -1912,7 +1899,7 @@ int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu)
struct kvm_lapic *apic = vcpu->arch.apic;
int highest_irr;
if (!kvm_vcpu_has_lapic(vcpu) || !apic_enabled(apic))
if (!apic_enabled(apic))
return -1;
apic_update_ppr(apic);