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-rw-r--r--tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c338
1 files changed, 336 insertions, 2 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 a96830243195..253e4304bbe3 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
@@ -404,6 +404,331 @@ static bool use_amd_pmu(void)
is_zen3(family, model));
}
+/*
+ * "MEM_INST_RETIRED.ALL_LOADS", "MEM_INST_RETIRED.ALL_STORES", and
+ * "MEM_INST_RETIRED.ANY" from https://perfmon-events.intel.com/
+ * supported on Intel Xeon processors:
+ * - Sapphire Rapids, Ice Lake, Cascade Lake, Skylake.
+ */
+#define MEM_INST_RETIRED 0xD0
+#define MEM_INST_RETIRED_LOAD EVENT(MEM_INST_RETIRED, 0x81)
+#define MEM_INST_RETIRED_STORE EVENT(MEM_INST_RETIRED, 0x82)
+#define MEM_INST_RETIRED_LOAD_STORE EVENT(MEM_INST_RETIRED, 0x83)
+
+static bool supports_event_mem_inst_retired(void)
+{
+ uint32_t eax, ebx, ecx, edx;
+
+ cpuid(1, &eax, &ebx, &ecx, &edx);
+ if (x86_family(eax) == 0x6) {
+ switch (x86_model(eax)) {
+ /* Sapphire Rapids */
+ case 0x8F:
+ /* Ice Lake */
+ case 0x6A:
+ /* Skylake */
+ /* Cascade Lake */
+ case 0x55:
+ return true;
+ }
+ }
+
+ return false;
+}
+
+/*
+ * "LS Dispatch", from Processor Programming Reference
+ * (PPR) for AMD Family 17h Model 01h, Revision B1 Processors,
+ * Preliminary Processor Programming Reference (PPR) for AMD Family
+ * 17h Model 31h, Revision B0 Processors, and Preliminary Processor
+ * Programming Reference (PPR) for AMD Family 19h Model 01h, Revision
+ * B1 Processors Volume 1 of 2.
+ */
+#define LS_DISPATCH 0x29
+#define LS_DISPATCH_LOAD EVENT(LS_DISPATCH, BIT(0))
+#define LS_DISPATCH_STORE EVENT(LS_DISPATCH, BIT(1))
+#define LS_DISPATCH_LOAD_STORE EVENT(LS_DISPATCH, BIT(2))
+
+#define INCLUDE_MASKED_ENTRY(event_select, mask, match) \
+ KVM_PMU_ENCODE_MASKED_ENTRY(event_select, mask, match, false)
+#define EXCLUDE_MASKED_ENTRY(event_select, mask, match) \
+ KVM_PMU_ENCODE_MASKED_ENTRY(event_select, mask, match, true)
+
+struct perf_counter {
+ union {
+ uint64_t raw;
+ struct {
+ uint64_t loads:22;
+ uint64_t stores:22;
+ uint64_t loads_stores:20;
+ };
+ };
+};
+
+static uint64_t masked_events_guest_test(uint32_t msr_base)
+{
+ uint64_t ld0, ld1, st0, st1, ls0, ls1;
+ struct perf_counter c;
+ int val;
+
+ /*
+ * The acutal value of the counters don't determine the outcome of
+ * the test. Only that they are zero or non-zero.
+ */
+ ld0 = rdmsr(msr_base + 0);
+ st0 = rdmsr(msr_base + 1);
+ ls0 = rdmsr(msr_base + 2);
+
+ __asm__ __volatile__("movl $0, %[v];"
+ "movl %[v], %%eax;"
+ "incl %[v];"
+ : [v]"+m"(val) :: "eax");
+
+ ld1 = rdmsr(msr_base + 0);
+ st1 = rdmsr(msr_base + 1);
+ ls1 = rdmsr(msr_base + 2);
+
+ c.loads = ld1 - ld0;
+ c.stores = st1 - st0;
+ c.loads_stores = ls1 - ls0;
+
+ return c.raw;
+}
+
+static void intel_masked_events_guest_code(void)
+{
+ uint64_t r;
+
+ for (;;) {
+ wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0);
+
+ wrmsr(MSR_P6_EVNTSEL0 + 0, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | MEM_INST_RETIRED_LOAD);
+ wrmsr(MSR_P6_EVNTSEL0 + 1, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | MEM_INST_RETIRED_STORE);
+ wrmsr(MSR_P6_EVNTSEL0 + 2, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | MEM_INST_RETIRED_LOAD_STORE);
+
+ wrmsr(MSR_CORE_PERF_GLOBAL_CTRL, 0x7);
+
+ r = masked_events_guest_test(MSR_IA32_PMC0);
+
+ GUEST_SYNC(r);
+ }
+}
+
+static void amd_masked_events_guest_code(void)
+{
+ uint64_t r;
+
+ for (;;) {
+ wrmsr(MSR_K7_EVNTSEL0, 0);
+ wrmsr(MSR_K7_EVNTSEL1, 0);
+ wrmsr(MSR_K7_EVNTSEL2, 0);
+
+ wrmsr(MSR_K7_EVNTSEL0, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | LS_DISPATCH_LOAD);
+ wrmsr(MSR_K7_EVNTSEL1, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | LS_DISPATCH_STORE);
+ wrmsr(MSR_K7_EVNTSEL2, ARCH_PERFMON_EVENTSEL_ENABLE |
+ ARCH_PERFMON_EVENTSEL_OS | LS_DISPATCH_LOAD_STORE);
+
+ r = masked_events_guest_test(MSR_K7_PERFCTR0);
+
+ GUEST_SYNC(r);
+ }
+}
+
+static struct perf_counter run_masked_events_test(struct kvm_vcpu *vcpu,
+ const uint64_t masked_events[],
+ const int nmasked_events)
+{
+ struct kvm_pmu_event_filter *f;
+ struct perf_counter r;
+
+ f = create_pmu_event_filter(masked_events, nmasked_events,
+ KVM_PMU_EVENT_ALLOW,
+ KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
+ r.raw = test_with_filter(vcpu, f);
+ free(f);
+
+ return r;
+}
+
+/* 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)
+
+struct masked_events_test {
+ uint64_t intel_events[MAX_TEST_EVENTS];
+ uint64_t intel_event_end;
+ uint64_t amd_events[MAX_TEST_EVENTS];
+ uint64_t amd_event_end;
+ const char *msg;
+ uint32_t flags;
+};
+
+/*
+ * These are the test cases for the masked events tests.
+ *
+ * For each test, the guest enables 3 PMU counters (loads, stores,
+ * loads + stores). The filter is then set in KVM with the masked events
+ * provided. The test then verifies that the counters agree with which
+ * ones should be counting and which ones should be filtered.
+ */
+const struct masked_events_test test_cases[] = {
+ {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFF, 0x81),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xFF, BIT(0)),
+ },
+ .msg = "Only allow loads.",
+ .flags = ALLOW_LOADS,
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFF, 0x82),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xFF, BIT(1)),
+ },
+ .msg = "Only allow stores.",
+ .flags = ALLOW_STORES,
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFF, 0x83),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xFF, BIT(2)),
+ },
+ .msg = "Only allow loads + stores.",
+ .flags = ALLOW_LOADS_STORES,
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0x7C, 0),
+ EXCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFF, 0x83),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, ~(BIT(0) | BIT(1)), 0),
+ },
+ .msg = "Only allow loads and stores.",
+ .flags = ALLOW_LOADS | ALLOW_STORES,
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0x7C, 0),
+ EXCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFF, 0x82),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xF8, 0),
+ EXCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xFF, BIT(1)),
+ },
+ .msg = "Only allow loads and loads + stores.",
+ .flags = ALLOW_LOADS | ALLOW_LOADS_STORES
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0xFE, 0x82),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xF8, 0),
+ EXCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xFF, BIT(0)),
+ },
+ .msg = "Only allow stores and loads + stores.",
+ .flags = ALLOW_STORES | ALLOW_LOADS_STORES
+ }, {
+ .intel_events = {
+ INCLUDE_MASKED_ENTRY(MEM_INST_RETIRED, 0x7C, 0),
+ },
+ .amd_events = {
+ INCLUDE_MASKED_ENTRY(LS_DISPATCH, 0xF8, 0),
+ },
+ .msg = "Only allow loads, stores, and loads + stores.",
+ .flags = ALLOW_LOADS | ALLOW_STORES | ALLOW_LOADS_STORES
+ },
+};
+
+static int append_test_events(const struct masked_events_test *test,
+ uint64_t *events, int nevents)
+{
+ const uint64_t *evts;
+ int i;
+
+ evts = use_intel_pmu() ? test->intel_events : test->amd_events;
+ for (i = 0; i < MAX_TEST_EVENTS; i++) {
+ if (evts[i] == 0)
+ break;
+
+ events[nevents + i] = evts[i];
+ }
+
+ return nevents + i;
+}
+
+static bool bool_eq(bool a, bool b)
+{
+ return a == b;
+}
+
+static void run_masked_events_tests(struct kvm_vcpu *vcpu, uint64_t *events,
+ int nevents)
+{
+ int ntests = ARRAY_SIZE(test_cases);
+ struct perf_counter c;
+ int i, n;
+
+ for (i = 0; i < ntests; i++) {
+ const struct masked_events_test *test = &test_cases[i];
+
+ /* Do any test case events overflow MAX_TEST_EVENTS? */
+ assert(test->intel_event_end == 0);
+ assert(test->amd_event_end == 0);
+
+ n = append_test_events(test, events, nevents);
+
+ c = run_masked_events_test(vcpu, events, n);
+ TEST_ASSERT(bool_eq(c.loads, test->flags & ALLOW_LOADS) &&
+ bool_eq(c.stores, test->flags & ALLOW_STORES) &&
+ bool_eq(c.loads_stores,
+ test->flags & ALLOW_LOADS_STORES),
+ "%s loads: %u, stores: %u, loads + stores: %u",
+ test->msg, c.loads, c.stores, c.loads_stores);
+ }
+}
+
+static void add_dummy_events(uint64_t *events, int nevents)
+{
+ int i;
+
+ for (i = 0; i < nevents; i++) {
+ int event_select = i % 0xFF;
+ bool exclude = ((i % 4) == 0);
+
+ if (event_select == MEM_INST_RETIRED ||
+ event_select == LS_DISPATCH)
+ event_select++;
+
+ events[i] = KVM_PMU_ENCODE_MASKED_ENTRY(event_select, 0,
+ 0, exclude);
+ }
+}
+
+static void test_masked_events(struct kvm_vcpu *vcpu)
+{
+ int nevents = MAX_FILTER_EVENTS - MAX_TEST_EVENTS;
+ uint64_t events[MAX_FILTER_EVENTS];
+
+ /* Run the test cases against a sparse PMU event filter. */
+ run_masked_events_tests(vcpu, events, 0);
+
+ /* Run the test cases against a dense PMU event filter. */
+ add_dummy_events(events, MAX_FILTER_EVENTS);
+ 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)
{
@@ -432,7 +757,7 @@ static void test_filter_ioctl(struct kvm_vcpu *vcpu)
r = run_filter_test(vcpu, &e, 1, KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
TEST_ASSERT(r != 0, "Invalid PMU Event Filter is expected to fail");
- e = KVM_PMU_EVENT_ENCODE_MASKED_ENTRY(0xff, 0xff, 0xff, 0xf);
+ e = KVM_PMU_ENCODE_MASKED_ENTRY(0xff, 0xff, 0xff, 0xf);
r = run_filter_test(vcpu, &e, 1, KVM_PMU_EVENT_FLAG_MASKED_EVENTS);
TEST_ASSERT(r == 0, "Valid PMU Event Filter is failing");
}
@@ -440,7 +765,7 @@ static void test_filter_ioctl(struct kvm_vcpu *vcpu)
int main(int argc, char *argv[])
{
void (*guest_code)(void);
- struct kvm_vcpu *vcpu;
+ struct kvm_vcpu *vcpu, *vcpu2 = NULL;
struct kvm_vm *vm;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_PMU_EVENT_FILTER));
@@ -465,6 +790,15 @@ int main(int argc, char *argv[])
test_not_member_deny_list(vcpu);
test_not_member_allow_list(vcpu);
+ if (use_intel_pmu() &&
+ supports_event_mem_inst_retired() &&
+ kvm_cpu_property(X86_PROPERTY_PMU_NR_GP_COUNTERS) >= 3)
+ vcpu2 = vm_vcpu_add(vm, 2, intel_masked_events_guest_code);
+ else if (use_amd_pmu())
+ vcpu2 = vm_vcpu_add(vm, 2, amd_masked_events_guest_code);
+
+ if (vcpu2)
+ test_masked_events(vcpu2);
test_filter_ioctl(vcpu);
kvm_vm_free(vm);
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-28 16:24:22 +0100