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kvm: Introduce kvm_irqchip_add/remove_irqfd

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Add services to associate an eventfd file descriptor as input with an
IRQ line as output. Such a line can be an input pin of an in-kernel
irqchip or a virtual line returned by kvm_irqchip_add_route.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-05-17 10:32:36 -03:00 committed by Avi Kivity
parent e7b2030862
commit 39853bbc49
3 changed files with 43 additions and 0 deletions
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30
kvm-all.c
View File

@ -1108,6 +1108,21 @@ int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
return virq;
}
static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
{
struct kvm_irqfd irqfd = {
.fd = fd,
.gsi = virq,
.flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
};
if (!kvm_irqchip_in_kernel()) {
return -ENOSYS;
}
return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
}
#else /* !KVM_CAP_IRQ_ROUTING */
static void kvm_init_irq_routing(KVMState *s)
@ -1123,8 +1138,23 @@ int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
{
abort();
}
static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
{
abort();
}
#endif /* !KVM_CAP_IRQ_ROUTING */
int kvm_irqchip_add_irqfd(KVMState *s, int fd, int virq)
{
return kvm_irqchip_assign_irqfd(s, fd, virq, true);
}
int kvm_irqchip_remove_irqfd(KVMState *s, int fd, int virq)
{
return kvm_irqchip_assign_irqfd(s, fd, virq, false);
}
static int kvm_irqchip_create(KVMState *s)
{
QemuOptsList *list = qemu_find_opts("machine");

10
kvm-stub.c
View File

@ -140,3 +140,13 @@ int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
void kvm_irqchip_release_virq(KVMState *s, int virq)
{
}
int kvm_irqchip_add_irqfd(KVMState *s, int fd, int virq)
{
return -ENOSYS;
}
int kvm_irqchip_remove_irqfd(KVMState *s, int fd, int virq)
{
return -ENOSYS;
}

3
kvm.h
View File

@ -215,4 +215,7 @@ int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg);
void kvm_irqchip_release_virq(KVMState *s, int virq);
int kvm_irqchip_add_irqfd(KVMState *s, int fd, int virq);
int kvm_irqchip_remove_irqfd(KVMState *s, int fd, int virq);
#endif