On Thu, Dec 06, 2018 at 06:51:37PM +0000, Suzuki K Poulose wrote:
>
>
> On 06/12/2018 17:21, Suzuki K Poulose wrote:
> > Hi Andrew,
> >
> > On 05/12/2018 15:30, 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 events as well as accessors for updating them.
> > >
> > > Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx>
> > > ---
> > > arch/arm64/include/asm/kvm_host.h | 24 ++++++++++++++++++++++++
> > > 1 file changed, 24 insertions(+)
> > >
> > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > > index 1550192..800c87b 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;
> > > + u32 events_guest;
> > > };
> > > typedef struct kvm_cpu_context kvm_cpu_context_t;
> > > @@ -467,11 +469,33 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu);
> > > void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu);
> > > void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu);
> > > +#define KVM_PMU_EVENTS_HOST 1
> > > +#define KVM_PMU_EVENTS_GUEST 2
> > > +
> > > #ifdef CONFIG_KVM /* Avoid conflicts with core headers if CONFIG_KVM=n */
> > > 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_set_pmu_events(u32 set, int flags)
> > > +{
> > > + kvm_cpu_context_t *ctx = this_cpu_ptr(&kvm_host_cpu_state);
> > > +
> > > + if (flags & KVM_PMU_EVENTS_HOST)
> > > + ctx->events_host |= set;
> > > + if (flags & KVM_PMU_EVENTS_GUEST)
> > > + ctx->events_guest |= set;
> >
> > You seem to be passing a single flag at a time ever, in the next patch.
> > Either we can batch the calls in the next patch, or make this a real number and
> > not a flag. g.g, enum { HOST, GUEST } or even a bool.
> >
> > I think the former sounds better.
>
> Having another look at patch-3, we can never club set() calls for host &
> guest events, we should go for the latter.
Well we could always do this..
u32 flags = 0;
if (!attr->exclude_host)
flags |= KVM_PMU_EVENTS_HOST;
if (!attr->exclude_guest)
flags |= KVM_PMU_EVENTS_GUEST;
kvm_set_pmu_events(counter_bits, flags);
Thanks,
Andrew Murray
>
> Suzuki
>
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