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Raghavendra Rao Ananta fb5b4d675d KVM: arm64: Ignore PMCNTENSET_EL0 while checking for overflow status ... commit 54bbee190d42166209185d89070c58a343bf514b upstream. DDI0487K.a D13.3.1 describes the PMU overflow condition, which evaluates to true if any counter's global enable (PMCR_EL0.E), overflow flag (PMOVSSET_EL0[n]), and interrupt enable (PMINTENSET_EL1[n]) are all 1. Of note, this does not require a counter to be enabled (i.e. PMCNTENSET_EL0[n] = 1) to generate an overflow. Align kvm_pmu_overflow_status() with the reality of the architecture and stop using PMCNTENSET_EL0 as part of the overflow condition. The bug was discovered while running an SBSA PMU test [*], which only sets PMCR.E, PMOVSSET<0>, PMINTENSET<0>, and expects an overflow interrupt. Cc: stable@vger.kernel.org Fixes: 76d883c4e6 ("arm64: KVM: Add access handler for PMOVSSET and PMOVSCLR register") Link: https://github.com/ARM-software/sbsa-acs/blob/master/test_pool/pmu/operating_system/test_pmu001.c Signed-off-by: Raghavendra Rao Ananta <rananta@google.com> [ oliver: massaged changelog ] Reviewed-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20241120005230.2335682-2-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-12-19 18:05:04 +01:00
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kvm	KVM: arm64: Ignore PMCNTENSET_EL0 while checking for overflow status	2024-12-19 18:05:04 +01:00
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