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kvm: Conditionally register IRQ bypass consumer

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If we don't support a mechanism for bypassing IRQs, don't register as
a consumer.  This eliminates meaningless dev_info()s when the connect
fails between producer and consumer, such as on AMD systems where
kvm_x86_ops->update_pi_irte is not implemented

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Williamson 2016-05-05 11:58:35 -06:00 committed by Paolo Bonzini
parent b52f3ed022
commit 14717e2031
3 changed files with 19 additions and 19 deletions
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19
arch/x86/kvm/x86.c
View File

@ -8358,19 +8358,21 @@ bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
}
EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
bool kvm_arch_has_irq_bypass(void)
{
return kvm_x86_ops->update_pi_irte != NULL;
}
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
struct irq_bypass_producer *prod)
{
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
if (kvm_x86_ops->update_pi_irte) {
irqfd->producer = prod;
return kvm_x86_ops->update_pi_irte(irqfd->kvm,
prod->irq, irqfd->gsi, 1);
}
irqfd->producer = prod;
return -EINVAL;
return kvm_x86_ops->update_pi_irte(irqfd->kvm,
prod->irq, irqfd->gsi, 1);
}
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
@ -8380,11 +8382,6 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer);
if (!kvm_x86_ops->update_pi_irte) {
WARN_ON(irqfd->producer != NULL);
return;
}
WARN_ON(irqfd->producer != prod);
irqfd->producer = NULL;

1
include/linux/kvm_host.h
View File

@ -1185,6 +1185,7 @@ static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
bool kvm_arch_has_irq_bypass(void);
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
struct irq_bypass_producer *);
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,

18
virt/kvm/eventfd.c
View File

@ -408,15 +408,17 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
*/
fdput(f);
#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
irqfd->consumer.token = (void *)irqfd->eventfd;
irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
irqfd->consumer.del_producer = kvm_arch_irq_bypass_del_producer;
irqfd->consumer.stop = kvm_arch_irq_bypass_stop;
irqfd->consumer.start = kvm_arch_irq_bypass_start;
ret = irq_bypass_register_consumer(&irqfd->consumer);
if (ret)
pr_info("irq bypass consumer (token %p) registration fails: %d\n",
if (kvm_arch_has_irq_bypass()) {
irqfd->consumer.token = (void *)irqfd->eventfd;
irqfd->consumer.add_producer = kvm_arch_irq_bypass_add_producer;
irqfd->consumer.del_producer = kvm_arch_irq_bypass_del_producer;
irqfd->consumer.stop = kvm_arch_irq_bypass_stop;
irqfd->consumer.start = kvm_arch_irq_bypass_start;
ret = irq_bypass_register_consumer(&irqfd->consumer);
if (ret)
pr_info("irq bypass consumer (token %p) registration fails: %d\n",
irqfd->consumer.token, ret);
}
#endif
return 0;