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authorEric Auger <eric.auger@linaro.org>2015-03-04 11:14:36 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2015-03-12 15:15:34 +0100
commit174178fed338edba66ab9580af0c5d9e1a4e5019 (patch)
treec290d6b6ae1464dd7dc72bfe63e0bb0553eac460 /arch/arm/kvm
parent649cf73994e8ac69dfe3e7a35fba9acf051e7fe6 (diff)
downloadblackbird-op-linux-174178fed338edba66ab9580af0c5d9e1a4e5019.tar.gz
blackbird-op-linux-174178fed338edba66ab9580af0c5d9e1a4e5019.zip
KVM: arm/arm64: add irqfd support
This patch enables irqfd on arm/arm64. Both irqfd and resamplefd are supported. Injection is implemented in vgic.c without routing. This patch enables CONFIG_HAVE_KVM_EVENTFD and CONFIG_HAVE_KVM_IRQFD. KVM_CAP_IRQFD is now advertised. KVM_CAP_IRQFD_RESAMPLE capability automatically is advertised as soon as CONFIG_HAVE_KVM_IRQFD is set. Irqfd injection is restricted to SPI. The rationale behind not supporting PPI irqfd injection is that any device using a PPI would be a private-to-the-CPU device (timer for instance), so its state would have to be context-switched along with the VCPU and would require in-kernel wiring anyhow. It is not a relevant use case for irqfds. Signed-off-by: Eric Auger <eric.auger@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm')
-rw-r--r--arch/arm/kvm/Kconfig2
-rw-r--r--arch/arm/kvm/Makefile2
-rw-r--r--arch/arm/kvm/arm.c1
3 files changed, 4 insertions, 1 deletions
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 83a448e8192b..f1f79d104309 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -28,6 +28,8 @@ config KVM
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select SRCU
select MMU_NOTIFIER
+ select HAVE_KVM_EVENTFD
+ select HAVE_KVM_IRQFD
depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
---help---
Support hosting virtualized guest machines.
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index 60be7be4c824..a093bf125ca8 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -15,7 +15,7 @@ AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)
KVM := ../../../virt/kvm
-kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o
+kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o
obj-y += kvm-arm.o init.o interrupts.o
obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 5e893ebb9de7..cc96619f10a4 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -171,6 +171,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
int r;
switch (ext) {
case KVM_CAP_IRQCHIP:
+ case KVM_CAP_IRQFD:
case KVM_CAP_DEVICE_CTRL:
case KVM_CAP_USER_MEMORY:
case KVM_CAP_SYNC_MMU:
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