Re: [PATCH v9 12/22] KVM: arm64: Context swap Partitioned PMU guest registers

[sashiko-bot@kernel.org]

> Save and restore newly untrapped registers that can be directly
> accessed by the guest when the PMU is partitioned.
> 
> - PMEVCNTRn_EL0
> - PMCCNTR_EL0
> - PMSELR_EL0
> - PMCR_EL0
> - PMCNTEN_EL0
> - PMINTEN_EL1
> 
> If we know we are not partitioned (that is, using the emulated vPMU),
> then return immediately. A later patch will make this lazy so the
> context swaps don't happen unless the guest has accessed the PMU.
> 
> PMEVTYPER is handled in a following patch since we must apply the KVM
> event filter before writing values to hardware.
> 
> PMOVS guest counters are cleared to avoid the possibility of
> generating spurious interrupts when PMINTEN is written. This is fine
> because the virtual register for PMOVS is always the canonical value.
> 
> Signed-off-by: Colton Lewis <coltonlewis@google.com>

Sashiko has reviewed this patch and found no issues. It looks great!

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20260924172928.2110956-1-coltonlewis@google.com?part=12