linux

iv/linux

History

Marc Zyngier ebff0b0e3d KVM: arm64: Reset the PMU in preemptible context

We've become very cautious to now always reset the vcpu when nothing
is loaded on the physical CPU. To do so, we now disable preemption
and do a kvm_arch_vcpu_put() to make sure we have all the state
in memory (and that it won't be loaded behind out back).

This now causes issues with resetting the PMU, which calls into perf.
Perf itself uses mutexes, which clashes with the lack of preemption.
It is worth realizing that the PMU is fully emulated, and that
no PMU state is ever loaded on the physical CPU. This means we can
perfectly reset the PMU outside of the non-preemptible section.

Fixes: e761a927bc9a ("KVM: arm/arm64: Reset the VCPU without preemption and vcpu state loaded")
Reported-by: Julien Grall <julien.grall@arm.com>
Tested-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

2019-03-19 17:56:24 +00:00

hyp

ARM: some cleanups, direct physical timer assignment, cache sanitization

2019-03-15 15:00:28 -07:00

debug.c

arm/arm64: KVM: Introduce kvm_call_hyp_ret()

2019-02-19 21:05:24 +00:00

fpsimd.c

KVM: arm64: Avoid mistaken attempts to save SVE state for vcpus

2018-06-21 09:14:44 +01:00

guest.c

KVM updates for v4.20