KVM: arm64: nv: Apply EL2 event filtering when in hyp context

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It hopefully comes as no surprise when I say that vEL2 actually runs at
EL1. So, the guest hypervisor's EL2 event filter (NSH) needs to actually
be applied to EL1 in the perf event. In addition to this, the disable
bit for the guest counter range (HPMD) needs to have the effect of
stopping the affected counters.

Do exactly that by stuffing ::exclude_kernel with the combined effect of
these controls. This isn't quite enough yet, as the backing perf events
need to be reprogrammed upon nested ERET/exception entry to remap the
effective filter onto ::exclude_kernel.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241025182354.3364124-18-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Oliver Upton 2024-10-25 18:23:52 +00:00

parent 16535d55e9

commit 8a34979030

1 changed files with 20 additions and 1 deletions

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arch/arm64/kvm/pmu-emul.c

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