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| author | Marc Zyngier <maz@kernel.org> | 2022-11-13 17:38:21 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-17 16:39:51 +0100 |
| commit | 001d85bd6c039d3662a4f33a5d212ef3e0438b27 (patch) | |
| tree | 015ec842d0754c3a0212173e70b6d5b80f0449fb /arch/arm64/kvm/pmu-emul.c | |
| parent | KVM: arm64: PMU: Distinguish between 64bit counter and 64bit overflow (diff) | |
| download | linux-001d85bd6c039d3662a4f33a5d212ef3e0438b27.tar.xz linux-001d85bd6c039d3662a4f33a5d212ef3e0438b27.zip | |
KVM: arm64: PMU: Narrow the overflow checking when required
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
Diffstat (limited to 'arch/arm64/kvm/pmu-emul.c')
| -rw-r--r-- | arch/arm64/kvm/pmu-emul.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index d050143326b5..9e6bc7edc4de 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -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 */ |