[PATCH v2 0/2] KVM: arm64: Prevent spurious PMU accesses when no
maz at kernel.org
Tue Feb 9 06:48:42 EST 2021
Yet another PMU bug that is only likely to hit under Nested Virt: we
unconditionally access PMU registers without checking whether it
actually is present.
Given that we already have a predicate for this, promote it to a
static key, and use that in the world switch.
Thanks to Andre for the heads up!
* From v1:
- Fix compilation when CONFIG_ARM_PMU isn't selected
Marc Zyngier (2):
KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key
KVM: arm64: Don't access PMSELR_EL0/PMUSERENR_EL0 when no PMU is
arch/arm64/kernel/image-vars.h | 3 +++
arch/arm64/kvm/hyp/include/hyp/switch.h | 9 ++++++---
arch/arm64/kvm/perf.c | 10 ++++++++++
arch/arm64/kvm/pmu-emul.c | 10 ----------
include/kvm/arm_pmu.h | 9 +++++++--
5 files changed, 26 insertions(+), 15 deletions(-)
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