Re: [PATCH v6 3/6] KVM: selftests: Introduce __kvm_pmu_event_filter to improved event filter settings
From: JinrongLiang
Date: Thu Aug 10 2023 - 23:09:59 EST
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");
}