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| author | Andrew Murray <andrew.murray@arm.com> | 2019-04-09 20:22:15 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2019-04-24 15:46:26 +0100 |
| commit | 435e53fb5e21ad1820c5c69f208304c0e5623d01 (patch) | |
| tree | b3ad2d97114ca99f78c6edcc76c7b0e1446df91b /arch/arm | |
| parent | 3d91befbb3a0fcec6e1eebde45c8074b88cc9441 (diff) | |
| download | linux-435e53fb5e21ad1820c5c69f208304c0e5623d01.tar.gz linux-435e53fb5e21ad1820c5c69f208304c0e5623d01.tar.bz2 linux-435e53fb5e21ad1820c5c69f208304c0e5623d01.zip | |
arm64: KVM: Enable VHE support for :G/:H perf event modifiers
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>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/kvm_host.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h index 2d721ab05925..075e1921fdd9 100644 --- a/arch/arm/include/asm/kvm_host.h +++ b/arch/arm/include/asm/kvm_host.h @@ -368,6 +368,9 @@ static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {} static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {} static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {} +static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {} +static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {} + static inline void kvm_arm_vhe_guest_enter(void) {} static inline void kvm_arm_vhe_guest_exit(void) {} |