path: root/include/linux/kvm.h
diff options
authorGregory Haskins <ghaskins@novell.com>2009-05-20 10:30:49 -0400
committerAvi Kivity <avi@redhat.com>2009-09-10 08:32:41 +0300
commit721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3 (patch)
treec759fe98a4ea5e2e2a7694e4b44a558407077290 /include/linux/kvm.h
parent0ba12d10817a8db1fd7d96d3283ec6c0b294aeab (diff)
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 'include/linux/kvm.h')
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 7b17141c47c..8f53f24e527 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -418,6 +418,7 @@ struct kvm_trace_rec {
#ifdef __KVM_HAVE_MCE
#define KVM_CAP_MCE 31
+#define KVM_CAP_IRQFD 32
@@ -470,6 +471,15 @@ struct kvm_x86_mce {
+#define KVM_IRQFD_FLAG_DEASSIGN (1 << 0)
+struct kvm_irqfd {
+ __u32 fd;
+ __u32 gsi;
+ __u32 flags;
+ __u8 pad[20];
* ioctls for VM fds
@@ -514,6 +524,7 @@ struct kvm_x86_mce {
_IOW(KVMIO, 0x74, struct kvm_assigned_msix_entry)
#define KVM_DEASSIGN_DEV_IRQ _IOW(KVMIO, 0x75, struct kvm_assigned_irq)
+#define KVM_IRQFD _IOW(KVMIO, 0x76, struct kvm_irqfd)
* ioctls for vcpu fds