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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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435e53fb5e
With VHE different exception levels are used between the host (EL2) and
guest (EL1) with a shared exception level for userpace (EL0). We can take
advantage of this and use the PMU's exception level filtering to avoid
enabling/disabling counters in the world-switch code. Instead we just
modify the counter type to include or exclude EL0 at vcpu_{load,put} time.
We also ensure that trapped PMU system register writes do not re-enable
EL0 when reconfiguring the backing perf events.
This approach completely avoids blackout windows seen with !VHE.
Suggested-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
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|---|---|---|
| .. | ||
| hyp | ||
| debug.c | ||
| fpsimd.c | ||
| guest.c | ||
| handle_exit.c | ||
| hyp-init.S | ||
| hyp.S | ||
| inject_fault.c | ||
| irq.h | ||
| Kconfig | ||
| Makefile | ||
| pmu.c | ||
| regmap.c | ||
| reset.c | ||
| sys_regs_generic_v8.c | ||
| sys_regs.c | ||
| sys_regs.h | ||
| trace.h | ||
| va_layout.c | ||
| vgic-sys-reg-v3.c | ||