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.
Suzuki
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