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| author | Marc Zyngier <maz@kernel.org> | 2021-01-21 10:56:36 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2021-01-21 11:00:02 +0000 |
| commit | 9529aaa056edc76b3a41df616c71117ebe11e049 (patch) | |
| tree | edd4e60371e5001d130108f08604b9462160ecb6 | |
| parent | e1663372d5ffaa3fc79b7932878c5c860f735412 (diff) | |
| download | linux-9529aaa056edc76b3a41df616c71117ebe11e049.tar.bz2 | |
KVM: arm64: Filter out v8.1+ events on v8.0 HW
When running on v8.0 HW, make sure we don't try to advertise
events in the 0x4000-0x403f range.
Cc: stable@vger.kernel.org
Fixes: 88865beca9062 ("KVM: arm64: Mask out filtered events in PCMEID{0,1}_EL1")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210121105636.1478491-1-maz@kernel.org
| -rw-r--r-- | arch/arm64/kvm/pmu-emul.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c index 4ad66a532e38..247422ac78a9 100644 --- a/arch/arm64/kvm/pmu-emul.c +++ b/arch/arm64/kvm/pmu-emul.c @@ -788,7 +788,7 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) { unsigned long *bmap = vcpu->kvm->arch.pmu_filter; u64 val, mask = 0; - int base, i; + int base, i, nr_events; if (!pmceid1) { val = read_sysreg(pmceid0_el0); @@ -801,13 +801,17 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) if (!bmap) return val; + nr_events = kvm_pmu_event_mask(vcpu->kvm) + 1; + for (i = 0; i < 32; i += 8) { u64 byte; byte = bitmap_get_value8(bmap, base + i); mask |= byte << i; - byte = bitmap_get_value8(bmap, 0x4000 + base + i); - mask |= byte << (32 + i); + if (nr_events >= (0x4000 + base + 32)) { + byte = bitmap_get_value8(bmap, 0x4000 + base + i); + mask |= byte << (32 + i); + } } return val & mask; |