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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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11
include/linux/kvm.h
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@@ -418,6 +418,7 @@ struct kvm_trace_rec {
#ifdef __KVM_HAVE_MCE
#define KVM_CAP_MCE 31
#endif
#define KVM_CAP_IRQFD 32
#ifdef KVM_CAP_IRQ_ROUTING
@@ -470,6 +471,15 @@ struct kvm_x86_mce {
};
#endif
#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 {
#define KVM_ASSIGN_SET_MSIX_ENTRY \
_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