Re: [PATCH v6 3/6] KVM: selftests: Introduce __kvm_pmu_event_filter to improved event filter settings

JinrongLiang <ljr.kernel@xxxxxxxxx> · Fri, 11 Aug 2023 11:09:43 +0800

在 2023/8/10 17:09, Jinrong Liang 写道:
From: Jinrong Liang <cloudliang@xxxxxxxxxxx>

Add custom "__kvm_pmu_event_filter" structure to improve pmu event
filter settings. Simplifies event filter setup by organizing event
filter parameters in a cleaner, more organized way.

I apologize for the oversight in this patch submission. I forgot to 
include the "Reviewed-by" tag. Please find the updated information below:

Reviewed-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>

When reviewing the patch, please take this tag into account.


Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Jinrong Liang <cloudliang@xxxxxxxxxxx>
---
  .../kvm/x86_64/pmu_event_filter_test.c        | 182 +++++++++---------
  1 file changed, 90 insertions(+), 92 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
index 5ac05e64bec9..94f5a89aac40 100644
--- a/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
+++ b/tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
@@ -28,6 +28,10 @@
  
  #define NUM_BRANCHES 42
  
+/* Matches KVM_PMU_EVENT_FILTER_MAX_EVENTS in pmu.c */
+#define MAX_FILTER_EVENTS		300
+#define MAX_TEST_EVENTS		10
+
  /*
   * This is how the event selector and unit mask are stored in an AMD
   * core performance event-select register. Intel's format is similar,
@@ -69,21 +73,33 @@
  
  #define INST_RETIRED EVENT(0xc0, 0)
  
+struct __kvm_pmu_event_filter {
+	__u32 action;
+	__u32 nevents;
+	__u32 fixed_counter_bitmap;
+	__u32 flags;
+	__u32 pad[4];
+	__u64 events[MAX_FILTER_EVENTS];
+};
+
  /*
   * This event list comprises Intel's eight architectural events plus
   * AMD's "retired branch instructions" for Zen[123] (and possibly
   * other AMD CPUs).
   */
-static const uint64_t event_list[] = {
-	EVENT(0x3c, 0),
-	INST_RETIRED,
-	EVENT(0x3c, 1),
-	EVENT(0x2e, 0x4f),
-	EVENT(0x2e, 0x41),
-	EVENT(0xc4, 0),
-	EVENT(0xc5, 0),
-	EVENT(0xa4, 1),
-	AMD_ZEN_BR_RETIRED,
+static const struct __kvm_pmu_event_filter base_event_filter = {
+	.nevents = ARRAY_SIZE(base_event_filter.events),
+	.events = {
+		EVENT(0x3c, 0),
+		INST_RETIRED,
+		EVENT(0x3c, 1),
+		EVENT(0x2e, 0x4f),
+		EVENT(0x2e, 0x41),
+		EVENT(0xc4, 0),
+		EVENT(0xc5, 0),
+		EVENT(0xa4, 1),
+		AMD_ZEN_BR_RETIRED,
+	},
  };
  
  struct {
@@ -225,47 +241,11 @@ static bool sanity_check_pmu(struct kvm_vcpu *vcpu)
  	return !r;
  }
  
-static struct kvm_pmu_event_filter *alloc_pmu_event_filter(uint32_t nevents)
-{
-	struct kvm_pmu_event_filter *f;
-	int size = sizeof(*f) + nevents * sizeof(f->events[0]);
-
-	f = malloc(size);
-	TEST_ASSERT(f, "Out of memory");
-	memset(f, 0, size);
-	f->nevents = nevents;
-	return f;
-}
-
-
-static struct kvm_pmu_event_filter *
-create_pmu_event_filter(const uint64_t event_list[], int nevents,
-			uint32_t action, uint32_t flags)
-{
-	struct kvm_pmu_event_filter *f;
-	int i;
-
-	f = alloc_pmu_event_filter(nevents);
-	f->action = action;
-	f->flags = flags;
-	for (i = 0; i < nevents; i++)
-		f->events[i] = event_list[i];
-
-	return f;
-}
-
-static struct kvm_pmu_event_filter *event_filter(uint32_t action)
-{
-	return create_pmu_event_filter(event_list,
-				       ARRAY_SIZE(event_list),
-				       action, 0);
-}
-
  /*
   * Remove the first occurrence of 'event' (if any) from the filter's
   * event list.
   */
-static void remove_event(struct kvm_pmu_event_filter *f, uint64_t event)
+static void remove_event(struct __kvm_pmu_event_filter *f, uint64_t event)
  {
  	bool found = false;
  	int i;
@@ -313,66 +293,73 @@ static void test_without_filter(struct kvm_vcpu *vcpu)
  }
  
  static void test_with_filter(struct kvm_vcpu *vcpu,
-			     struct kvm_pmu_event_filter *f)
+			     struct __kvm_pmu_event_filter *__f)
  {
+	struct kvm_pmu_event_filter *f = (void *)__f;
+
  	vm_ioctl(vcpu->vm, KVM_SET_PMU_EVENT_FILTER, f);
  	run_vcpu_and_sync_pmc_results(vcpu);
  }
  
  static void test_amd_deny_list(struct kvm_vcpu *vcpu)
  {
-	uint64_t event = EVENT(0x1C2, 0);
-	struct kvm_pmu_event_filter *f;
+	struct __kvm_pmu_event_filter f = {
+		.action = KVM_PMU_EVENT_DENY,
+		.nevents = 1,
+		.events = {
+			EVENT(0x1C2, 0),
+		},
+	};
  
-	f = create_pmu_event_filter(&event, 1, KVM_PMU_EVENT_DENY, 0);
-	test_with_filter(vcpu, f);
-	free(f);
+	test_with_filter(vcpu, &f);
  
  	ASSERT_PMC_COUNTING_INSTRUCTIONS();
  }
  
  static void test_member_deny_list(struct kvm_vcpu *vcpu)
  {
-	struct kvm_pmu_event_filter *f = event_filter(KVM_PMU_EVENT_DENY);
+	struct __kvm_pmu_event_filter f = base_event_filter;
  
-	test_with_filter(vcpu, f);
-	free(f);
+	f.action = KVM_PMU_EVENT_DENY;
+	test_with_filter(vcpu, &f);
  
  	ASSERT_PMC_NOT_COUNTING_INSTRUCTIONS();
  }
  
  static void test_member_allow_list(struct kvm_vcpu *vcpu)
  {
-	struct kvm_pmu_event_filter *f = event_filter(KVM_PMU_EVENT_ALLOW);
+	struct __kvm_pmu_event_filter f = base_event_filter;
  
-	test_with_filter(vcpu, f);
-	free(f);
+	f.action = KVM_PMU_EVENT_ALLOW;
+	test_with_filter(vcpu, &f);
  
  	ASSERT_PMC_COUNTING_INSTRUCTIONS();
  }
  
  static void test_not_member_deny_list(struct kvm_vcpu *vcpu)
  {
-	struct kvm_pmu_event_filter *f = event_filter(KVM_PMU_EVENT_DENY);
+	struct __kvm_pmu_event_filter f = base_event_filter;
  
-	remove_event(f, INST_RETIRED);
-	remove_event(f, INTEL_BR_RETIRED);
-	remove_event(f, AMD_ZEN_BR_RETIRED);
-	test_with_filter(vcpu, f);
-	free(f);
+	f.action = KVM_PMU_EVENT_DENY;
+
+	remove_event(&f, INST_RETIRED);
+	remove_event(&f, INTEL_BR_RETIRED);
+	remove_event(&f, AMD_ZEN_BR_RETIRED);
+	test_with_filter(vcpu, &f);
  
  	ASSERT_PMC_COUNTING_INSTRUCTIONS();
  }
  
  static void test_not_member_allow_list(struct kvm_vcpu *vcpu)
  {
-	struct kvm_pmu_event_filter *f = event_filter(KVM_PMU_EVENT_ALLOW);
+	struct __kvm_pmu_event_filter f = base_event_filter;
+
+	f.action = KVM_PMU_EVENT_ALLOW;
  
-	remove_event(f, INST_RETIRED);
-	remove_event(f, INTEL_BR_RETIRED);
-	remove_event(f, AMD_ZEN_BR_RETIRED);
-	test_with_filter(vcpu, f);
-	free(f);
+	remove_event(&f, INST_RETIRED);
+	remove_event(&f, INTEL_BR_RETIRED);
+	remove_event(&f, AMD_ZEN_BR_RETIRED);
+	test_with_filter(vcpu, &f);
  
  	ASSERT_PMC_NOT_COUNTING_INSTRUCTIONS();
  }
@@ -567,19 +554,16 @@ static void run_masked_events_test(struct kvm_vcpu *vcpu,
  				   const uint64_t masked_events[],
  				   const int nmasked_events)
  {
-	struct kvm_pmu_event_filter *f;
+	struct __kvm_pmu_event_filter f = {
+		.nevents = nmasked_events,
+		.action = KVM_PMU_EVENT_ALLOW,
+		.flags = KVM_PMU_EVENT_FLAG_MASKED_EVENTS,
+	};
  
-	f = create_pmu_event_filter(masked_events, nmasked_events,
-				    KVM_PMU_EVENT_ALLOW,
-				    KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
-	test_with_filter(vcpu, f);
-	free(f);
+	memcpy(f.events, masked_events, sizeof(uint64_t) * nmasked_events);
+	test_with_filter(vcpu, &f);
  }
  
-/* Matches KVM_PMU_EVENT_FILTER_MAX_EVENTS in pmu.c */
-#define MAX_FILTER_EVENTS	300
-#define MAX_TEST_EVENTS		10
-
  #define ALLOW_LOADS		BIT(0)
  #define ALLOW_STORES		BIT(1)
  #define ALLOW_LOADS_STORES	BIT(2)
@@ -751,17 +735,27 @@ static void test_masked_events(struct kvm_vcpu *vcpu)
  	run_masked_events_tests(vcpu, events, nevents);
  }
  
-static int run_filter_test(struct kvm_vcpu *vcpu, const uint64_t *events,
-			   int nevents, uint32_t flags)
+static int do_vcpu_set_pmu_event_filter(struct kvm_vcpu *vcpu,
+					struct __kvm_pmu_event_filter *__f)
  {
-	struct kvm_pmu_event_filter *f;
-	int r;
+	struct kvm_pmu_event_filter *f = (void *)__f;
  
-	f = create_pmu_event_filter(events, nevents, KVM_PMU_EVENT_ALLOW, flags);
-	r = __vm_ioctl(vcpu->vm, KVM_SET_PMU_EVENT_FILTER, f);
-	free(f);
+	return __vm_ioctl(vcpu->vm, KVM_SET_PMU_EVENT_FILTER, f);
+}
+
+static int set_pmu_single_event_filter(struct kvm_vcpu *vcpu, uint64_t event,
+				       uint32_t flags, uint32_t action)
+{
+	struct __kvm_pmu_event_filter f = {
+		.nevents = 1,
+		.flags = flags,
+		.action = action,
+		.events = {
+			event,
+		},
+	};
  
-	return r;
+	return do_vcpu_set_pmu_event_filter(vcpu, &f);
  }
  
  static void test_filter_ioctl(struct kvm_vcpu *vcpu)
@@ -773,14 +767,18 @@ static void test_filter_ioctl(struct kvm_vcpu *vcpu)
  	 * Unfortunately having invalid bits set in event data is expected to
  	 * pass when flags == 0 (bits other than eventsel+umask).
  	 */
-	r = run_filter_test(vcpu, &e, 1, 0);
+	r = set_pmu_single_event_filter(vcpu, e, 0, KVM_PMU_EVENT_ALLOW);
  	TEST_ASSERT(r == 0, "Valid PMU Event Filter is failing");
  
-	r = run_filter_test(vcpu, &e, 1, KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
+	r = set_pmu_single_event_filter(vcpu, e,
+					KVM_PMU_EVENT_FLAG_MASKED_EVENTS,
+					KVM_PMU_EVENT_ALLOW);
  	TEST_ASSERT(r != 0, "Invalid PMU Event Filter is expected to fail");
  
  	e = KVM_PMU_ENCODE_MASKED_ENTRY(0xff, 0xff, 0xff, 0xf);
-	r = run_filter_test(vcpu, &e, 1, KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
+	r = set_pmu_single_event_filter(vcpu, e,
+					KVM_PMU_EVENT_FLAG_MASKED_EVENTS,
+					KVM_PMU_EVENT_ALLOW);
  	TEST_ASSERT(r == 0, "Valid PMU Event Filter is failing");
  }
  







