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Commit 1a02b270 authored by Eric Auger's avatar Eric Auger Committed by Paolo Bonzini
Browse files

KVM: introduce kvm_arch functions for IRQ bypass 



This patch introduces
- kvm_arch_irq_bypass_add_producer
- kvm_arch_irq_bypass_del_producer
- kvm_arch_irq_bypass_stop
- kvm_arch_irq_bypass_start

They make possible to specialize the KVM IRQ bypass consumer in
case CONFIG_KVM_HAVE_IRQ_BYPASS is set.

Signed-off-by: default avatarEric Auger <eric.auger@linaro.org>
[Add weak implementations of the callbacks. - Feng]
Signed-off-by: default avatarFeng Wu <feng.wu@intel.com>
Reviewed-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 166c9775

include/linux/kvm_host.h

+10 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/err.h>

#include <linux/irqflags.h>

#include <linux/context_tracking.h>

#include <linux/irqbypass.h>

#include <asm/signal.h>



#include <linux/kvm.h>
@@ -1163,4 +1164,13 @@ 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

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 *,

			   struct irq_bypass_producer *);

void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);

void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);

#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */

#endif

virt/kvm/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -47,3 +47,6 @@ config KVM_GENERIC_DIRTYLOG_READ_PROTECT 
config KVM_COMPAT

       def_bool y

       depends on COMPAT && !S390



config HAVE_KVM_IRQ_BYPASS

       bool

virt/kvm/eventfd.c

+12 −0
Original line number Diff line number Diff line
@@ -252,6 +252,18 @@ static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd) 
	write_seqcount_end(&irqfd->irq_entry_sc);

}



#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS

void __attribute__((weak)) kvm_arch_irq_bypass_stop(

				struct irq_bypass_consumer *cons)

{

}



void __attribute__((weak)) kvm_arch_irq_bypass_start(

				struct irq_bypass_consumer *cons)

{

}

#endif



static int

kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)

{