arm64: KVM: Enable !VHE support for :G/:H perf event modifiers

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Enable/disable event counters as appropriate when entering and exiting
the guest to enable support for guest or host only event counting.

For both VHE and non-VHE we switch the counters between host/guest at
EL2.

The PMU may be on when we change which counters are enabled however
we avoid adding an isb as we instead rely on existing context
synchronisation events: the eret to enter the guest (__guest_enter)
and eret in kvm_call_hyp for __kvm_vcpu_run_nvhe on returning.

Signed-off-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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Andrew Murray 2019-04-09 20:22:14 +01:00 • committed by Marc Zyngier

parent d1947bc4bc

commit 3d91befbb3

3 changed files with 48 additions and 0 deletions

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3

arch/arm64/include/asm/kvm_host.h

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6

arch/arm64/kvm/hyp/switch.c

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39

arch/arm64/kvm/pmu.c

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