linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Andrew Murray <andrew.murray@arm.com>
To: Christoffer Dall <christoffer.dall@arm.com>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org,
	Julien Thierry <julien.thierry@arm.com>
Subject: [PATCH v6 2/4] arm64: KVM: add accessors to track guest/host only counters
Date: Mon, 10 Dec 2018 09:45:57 +0000	[thread overview]
Message-ID: <1544435159-54781-3-git-send-email-andrew.murray@arm.com> (raw)
In-Reply-To: <1544435159-54781-1-git-send-email-andrew.murray@arm.com>

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@arm.com>
---
 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;
+}
+static inline void kvm_clr_pmu_events(u32 clr)
+{
+	kvm_cpu_context_t *ctx = this_cpu_ptr(&kvm_host_cpu_state);
+
+	ctx->events_host &= ~clr;
+	ctx->events_guest &= ~clr;
+}
+#else
+static inline void kvm_set_pmu_events(u32 set, int flags) {}
+static inline void kvm_clr_pmu_events(u32 clr) {}
 #endif
 
 static inline void kvm_arm_vhe_guest_enter(void)
-- 
2.7.4


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2018-12-10  9:46 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10  9:45 [PATCH v6 0/4] arm64: Support perf event modifiers :G and :H Andrew Murray
2018-12-10  9:45 ` [PATCH v6 1/4] arm64: arm_pmu: remove unnecessary isb instruction Andrew Murray
2018-12-10  9:45 ` Andrew Murray [this message]
2018-12-10 10:26   ` [PATCH v6 2/4] arm64: KVM: add accessors to track guest/host only counters Christoffer Dall
2018-12-10 23:46     ` Andrew Murray
2018-12-11  7:55       ` Christoffer Dall
2018-12-10  9:45 ` [PATCH v6 3/4] arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes Andrew Murray
2018-12-10  9:45 ` [PATCH v6 4/4] arm64: KVM: Enable support for :G/:H perf event modifiers Andrew Murray
2018-12-10 18:19 ` [PATCH v6 0/4] arm64: Support perf event modifiers :G and :H Will Deacon
2018-12-10 23:48   ` Andrew Murray

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1544435159-54781-3-git-send-email-andrew.murray@arm.com \
    --to=andrew.murray@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=christoffer.dall@arm.com \
    --cc=julien.thierry@arm.com \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=marc.zyngier@arm.com \
    --cc=mark.rutland@arm.com \
    --cc=suzuki.poulose@arm.com \
    --cc=will.deacon@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).