On Thu, Nov 22, 2018 at 11:25:48AM +0000, Andrew Murray wrote:
> In order to effeciently enable/disable guest/host only perf counters
> at guest entry/exit we add bitfields to kvm_cpu_context for guest and
> host only events as well as accessors for updating them.
>
> Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx>
> ---
> arch/arm64/include/asm/kvm_host.h | 20 ++++++++++++++++++++
> 1 file changed, 20 insertions(+)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 1550192..4a828eb 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -203,6 +203,8 @@ struct kvm_cpu_context {
> };
>
> struct kvm_vcpu *__hyp_running_vcpu;
> + u32 events_host_only;
> + u32 events_guest_only;
> };
>
> typedef struct kvm_cpu_context kvm_cpu_context_t;
> @@ -472,6 +474,24 @@ static inline int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
> {
> return kvm_arch_vcpu_run_map_fp(vcpu);
> }
> +static inline void kvm_clr_set_host_pmu_events(u32 clr, u32 set)
> +{
> + kvm_cpu_context_t *ctx = this_cpu_ptr(&kvm_host_cpu_state);
> +
> + ctx->events_host_only &= ~clr;
> + ctx->events_host_only |= set;
> +}
Do you actually need this clr/set function, or can you just use the
facilities provided by bitfield.h at the callsites?
Will
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