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KVM: irqfd

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KVM provides a complete virtual system environment for guests, including
support for injecting interrupts modeled after the real exception/interrupt
facilities present on the native platform (such as the IDT on x86).
Virtual interrupts can come from a variety of sources (emulated devices,
pass-through devices, etc) but all must be injected to the guest via
the KVM infrastructure.  This patch adds a new mechanism to inject a specific
interrupt to a guest using a decoupled eventfd mechnanism:  Any legal signal
on the irqfd (using eventfd semantics from either userspace or kernel) will
translate into an injected interrupt in the guest at the next available
interrupt window.

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gregory Haskins
2009-05-20 10:30:49 -04:00
committed by Avi Kivity
parent 0ba12d1081
commit 721eecbf4f
8 changed files with 383 additions and 1 deletions
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12
virt/kvm/kvm_main.c
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@@ -986,6 +986,7 @@ static struct kvm *kvm_create_vm(void)
spin_lock_init(&kvm->mmu_lock);
spin_lock_init(&kvm->requests_lock);
kvm_io_bus_init(&kvm->pio_bus);
kvm_irqfd_init(kvm);
mutex_init(&kvm->lock);
kvm_io_bus_init(&kvm->mmio_bus);
init_rwsem(&kvm->slots_lock);
@@ -1071,6 +1072,8 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
{
struct kvm *kvm = filp->private_data;
kvm_irqfd_release(kvm);
kvm_put_kvm(kvm);
return 0;
}
@@ -2222,6 +2225,15 @@ static long kvm_vm_ioctl(struct file *filp,
}
#endif
#endif /* KVM_CAP_IRQ_ROUTING */
case KVM_IRQFD: {
struct kvm_irqfd data;
r = -EFAULT;
if (copy_from_user(&data, argp, sizeof data))
goto out;
r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
break;
}
default:
r = kvm_arch_vm_ioctl(filp, ioctl, arg);
}