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KVM: arm64: Don't let userspace write to PMCR_EL0.N when the vcpu has EL2
authorMarc Zyngier <maz@kernel.org>
Wed, 9 Apr 2025 13:24:34 +0000 (14:24 +0100)
committerMarc Zyngier <maz@kernel.org>
Fri, 11 Apr 2025 12:08:23 +0000 (13:08 +0100)
commitcd84a42c6703f69a865bd8e48ee8107eb80e0dea
tree01729fdf13219d62319e30bd47acea3ca3c948bdtree
parentb7628c7973765c856866b3047c9002ae0825add6commit | diff
KVM: arm64: Don't let userspace write to PMCR_EL0.N when the vcpu has EL2

Now that userspace can provide its limit for hte maximum number of
counters, prevent it from writing to PMCR_EL0.N, as the value should
be derived from MDCR_EL2.HPMN in that case.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
arch/arm64/kvm/sys_regs.c diff | blob | history
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