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| author | Andrew Murray <andrew.murray@arm.com> | 2019-04-09 22:22:14 +0300 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-04-24 17:36:22 +0300 |
| commit | 3d91befbb3a0fcec6e1eebde45c8074b88cc9441 (patch) | |
| tree | dc87926a4232a95959cc882fb6c9bed5be26a9dd /arch/arm64/include/asm/kvm_host.h | |
| parent | d1947bc4bc63e56014bb4d812e0db89944ed4a0f (diff) | |
| download | linux-3d91befbb3a0fcec6e1eebde45c8074b88cc9441.tar.xz | |
arm64: KVM: Enable !VHE support for :G/:H perf event modifiers
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>
Diffstat (limited to 'arch/arm64/include/asm/kvm_host.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 655ad08edc3a..645d74c705d6 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -591,6 +591,9 @@ static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr); void kvm_clr_pmu_events(u32 clr); + +void __pmu_switch_to_host(struct kvm_cpu_context *host_ctxt); +bool __pmu_switch_to_guest(struct kvm_cpu_context *host_ctxt); #else static inline void kvm_set_pmu_events(u32 set, struct perf_event_attr *attr) {} static inline void kvm_clr_pmu_events(u32 clr) {} |