Re: [PATCH 0/4] KVM: arm64: PMU fixes for 6.13

[Marc Zyngier <maz@kernel.org>]

On Tue, 17 Dec 2024 17:53:32 +0000,
Oliver Upton <oliver.upton@linux.dev> wrote:
> 
> Small set of fixes for PMU, mostly focused on plugging gaps in nested
> support that I'd missed last time around:
> 
>  - Don't attempt to enable/disable EL2 counters when PMCR_EL0.E is
>    changed. This is already the case since the enable state of a
>    counter is re-evaluated in kvm_pmu_create_perf_event(), though the
>    handling of PMCR_EL0.E would suggest otherwise.
> 
>  - Enable/disable EL2 counters when MDCR_EL2.HPME is changed.
> 
>  - Only reset 'guest' counters when PMCR_EL0.P is set, excluding EL2
>    counters from being reset.
> 
> Applies to 6.13-rc3, tested on the M2 w/ my PMUv3 patches thrown on top.
> 
> Oliver Upton (4):
>   KVM: arm64: Add unified helper for reprogramming counters by mask
>   KVM: arm64: Use KVM_REQ_RELOAD_PMU to handle PMCR_EL0.E change
>   KVM: arm64: nv: Reload PMU events upon MDCR_EL2.HPME change
>   KVM: arm64: Only apply PMCR_EL0.P to the guest range of counters
> 
>  arch/arm64/kvm/pmu-emul.c | 89 +++++++++++++++------------------------
>  arch/arm64/kvm/sys_regs.c | 32 +++++++++++---
>  include/kvm/arm_pmu.h     |  6 +--
>  3 files changed, 62 insertions(+), 65 deletions(-)

Reviewed-by: Marc Zyngier <maz@kernel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.