diff options
| author | Gregory Haskins <ghaskins@novell.com> | 2009-05-20 16:30:49 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 07:32:41 +0200 |
| commit | 721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3 (patch) | |
| tree | c759fe98a4ea5e2e2a7694e4b44a558407077290 /virt/kvm/kvm_main.c | |
| parent | KVM: Move common KVM Kconfig items to new file virt/kvm/Kconfig (diff) | |
| download | linux-721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3.tar.xz linux-721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3.zip | |
KVM: irqfd
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>
Diffstat (limited to 'virt/kvm/kvm_main.c')
| -rw-r--r-- | virt/kvm/kvm_main.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 2884baf1d5f9..dee321e58894 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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); } |