From 721eecbf4fe995ca94a9edec0c9843b1cc0eaaf3 Mon Sep 17 00:00:00 2001 From: Gregory Haskins <ghaskins@novell.com> Date: Wed, 20 May 2009 10:30:49 -0400 Subject: 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> --- arch/x86/kvm/Kconfig | 1 + arch/x86/kvm/Makefile | 2 +- arch/x86/kvm/x86.c | 1 + 3 files changed, 3 insertions(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 939b1cb..8cd2a4e 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 bee9512..01e3c61 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 f064239..15f39fc 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: -- cgit v1.1