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KVM: arm64: PMU: Narrow the overflow checking when required

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For 64bit counters that overflow on a 32bit boundary, make
sure we only check the bottom 32bit to generate a CHAIN event.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Link: https://lore.kernel.org/r/20221113163832.3154370-6-maz@kernel.org
This commit is contained in:
Marc Zyngier 2022-11-13 16:38:21 +00:00
parent c82d28cbf1
commit 001d85bd6c
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kvm/pmu-emul.c
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@ -417,7 +417,8 @@ static void kvm_pmu_counter_increment(struct kvm_vcpu *vcpu,
reg = lower_32_bits(reg);
__vcpu_sys_reg(vcpu, PMEVCNTR0_EL0 + i) = reg;
if (reg) /* No overflow? move on */
/* No overflow? move on */
if (kvm_pmu_idx_has_64bit_overflow(vcpu, i) ? reg : lower_32_bits(reg))
continue;
/* Mark overflow */