tree 7dbeb6562c31a5a2ec73bae880966bdbd115c1c0
parent 3d9cd95f90b2987ef95182a4340a9150e06c4253
author Christoffer Dall <christoffer.dall@linaro.org> 1474941107 -0700
committer Christoffer Dall <christoffer.dall@linaro.org> 1474995427 +0200

KVM: arm64: Require in-kernel irqchip for PMU support

If userspace creates a PMU for the VCPU, but doesn't create an in-kernel
irqchip, then we end up in a nasty path where we try to take an
uninitialized spinlock, which can lead to all sorts of breakages.

Luckily, QEMU always creates the VGIC before the PMU, so we can
establish this as ABI and check for the VGIC in the PMU init stage.
This can be relaxed at a later time if we want to support PMU with a
userspace irqchip.

Cc: stable@vger.kernel.org
Cc: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>