linux_dsm_epyc7002/virt/kvm/arm
Christoffer Dall 61bbe38027 KVM: arm/arm64: Avoid work when userspace iqchips are not used
We currently check if the VM has a userspace irqchip in several places
along the critical path, and if so, we do some work which is only
required for having an irqchip in userspace.  This is unfortunate, as we
could avoid doing any work entirely, if we didn't have to support
irqchip in userspace.

Realizing the userspace irqchip on ARM is mostly a developer or hobby
feature, and is unlikely to be used in servers or other scenarios where
performance is a priority, we can use a refcounted static key to only
check the irqchip configuration when we have at least one VM that uses
an irqchip in userspace.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2018-01-02 10:05:46 +01:00
..
hyp KVM: arm/arm64: Fix broken GICH_ELRSR big endian conversion 2017-12-04 14:25:33 +01:00
vgic KVM: arm/arm64: Support VGIC dist pend/active changes for mapped IRQs 2018-01-02 10:05:46 +01:00
aarch32.c KVM: arm/arm64: Unify 32bit fault injection 2017-11-06 16:23:20 +01:00
arch_timer.c KVM: arm/arm64: Avoid work when userspace iqchips are not used 2018-01-02 10:05:46 +01:00
arm.c KVM: arm/arm64: Avoid work when userspace iqchips are not used 2018-01-02 10:05:46 +01:00
mmio.c KVM: arm/arm64: Move shared files to virt/kvm/arm 2017-05-04 13:57:26 +02:00
mmu.c KVM: arm/arm64: Fix guest external abort matching 2017-09-05 17:33:37 +02:00
perf.c KVM: arm/arm64: Move shared files to virt/kvm/arm 2017-05-04 13:57:26 +02:00
pmu.c KVM: arm/arm64: PMU: Fix overflow interrupt injection 2017-07-25 14:18:01 +01:00
psci.c KVM: arm/arm64: change exit request to sleep request 2017-06-04 16:53:55 +02:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00