diff options
| author | Gregory Haskins <ghaskins@novell.com> | 2009-05-20 10:30:49 -0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-09-10 08:32:41 +0300 |
| commit | 721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3 (patch) | |
| tree | c759fe98a4ea5e2e2a7694e4b44a558407077290 /arch/x86 | |
| parent | 0ba12d10817a8db1fd7d96d3283ec6c0b294aeab (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 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/Makefile | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
3 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 939b1cb9c5b..8cd2a4efe23 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -26,6 +26,7 @@ config KVM select MMU_NOTIFIER select ANON_INODES select HAVE_KVM_IRQCHIP + select HAVE_KVM_EVENTFD ---help--- Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index bee9512cd60..01e3c61f749 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -2,7 +2,7 @@ EXTRA_CFLAGS += -Ivirt/kvm -Iarch/x86/kvm kvm-y += $(addprefix ../../../virt/kvm/, kvm_main.o ioapic.o \ - coalesced_mmio.o irq_comm.o) + coalesced_mmio.o irq_comm.o eventfd.o) kvm-$(CONFIG_KVM_TRACE) += $(addprefix ../../../virt/kvm/, kvm_trace.o) kvm-$(CONFIG_IOMMU_API) += $(addprefix ../../../virt/kvm/, iommu.o) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f0642396783..15f39fc08ec 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1126,6 +1126,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_REINJECT_CONTROL: case KVM_CAP_IRQ_INJECT_STATUS: case KVM_CAP_ASSIGN_DEV_IRQ: + case KVM_CAP_IRQFD: r = 1; break; case KVM_CAP_COALESCED_MMIO: |