linux-kernel - [PATCH 09/31] perf, kvm: Support :t and :c perf modifiers in KVM arch perfmon emulation

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Date:	Thu, 27 Sep 2012 21:31:14 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	x86@...nel.org, a.p.zijlstra@...llo.nl, eranian@...gle.com,
	acme@...hat.com, Andi Kleen <ak@...ux.intel.com>, avi@...hat.com
Subject: [PATCH 09/31] perf, kvm: Support :t and :c perf modifiers in KVM arch perfmon emulation

From: Andi Kleen <ak@...ux.intel.com>

This is not arch perfmon, but older CPUs will just ignore it. This makes
it possible to do at least some TSX measurements from a KVM guest

Cc: avi@...hat.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/cpu/perf_event_intel.c |    3 ++-
 arch/x86/kvm/pmu.c                     |   10 +++++++---
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 7dab353..cd48669 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1631,7 +1631,8 @@ static int hsw_hw_config(struct perf_event *event)
 	return 0;
 }
 
-static struct event_constraint counter2_constraint = EVENT_CONSTRAINT(0, 0x4, 0);
+static struct event_constraint counter2_constraint = 
+			EVENT_CONSTRAINT(0, 0x4, 0);
 
 static struct event_constraint *
 hsw_get_event_constraints(struct cpu_hw_events *cpuc, struct perf_event *event)
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 9b7ec11..03ba87b 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -160,7 +160,7 @@ static void stop_counter(struct kvm_pmc *pmc)
 
 static void reprogram_counter(struct kvm_pmc *pmc, u32 type,
 		unsigned config, bool exclude_user, bool exclude_kernel,
-		bool intr)
+		bool intr, bool intx, bool intx_cp)
 {
 	struct perf_event *event;
 	struct perf_event_attr attr = {
@@ -172,6 +172,8 @@ static void reprogram_counter(struct kvm_pmc *pmc, u32 type,
 		.exclude_user = exclude_user,
 		.exclude_kernel = exclude_kernel,
 		.config = config,
+		.intx = intx,
+		.intx_checkpointed = intx_cp
 	};
 
 	attr.sample_period = (-pmc->counter) & pmc_bitmask(pmc);
@@ -239,7 +241,9 @@ static void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)
 	reprogram_counter(pmc, type, config,
 			!(eventsel & ARCH_PERFMON_EVENTSEL_USR),
 			!(eventsel & ARCH_PERFMON_EVENTSEL_OS),
-			eventsel & ARCH_PERFMON_EVENTSEL_INT);
+			eventsel & ARCH_PERFMON_EVENTSEL_INT,
+			!!(eventsel & HSW_INTX),
+			!!(eventsel & HSW_INTX_CHECKPOINTED));
 }
 
 static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx)
@@ -256,7 +260,7 @@ static void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 en_pmi, int idx)
 			arch_events[fixed_pmc_events[idx]].event_type,
 			!(en & 0x2), /* exclude user */
 			!(en & 0x1), /* exclude kernel */
-			pmi);
+			pmi, false, false);
 }
 
 static inline u8 fixed_en_pmi(u64 ctrl, int idx)
-- 
1.7.7.6

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