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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>