@@ -17,7 +17,7 @@
* Number of instructions in each loop. 1 CLFLUSH/CLFLUSHOPT/NOP, 1 MFENCE,
* 1 LOOP.
*/
-#define NUM_INSNS_PER_LOOP 3
+#define NUM_INSNS_PER_LOOP 4
/*
* Number of "extra" instructions that will be counted, i.e. the number of
@@ -162,13 +162,14 @@ do { \
"1:\n\t" \
clflush "\n\t" \
"mfence\n\t" \
+ "mov %[m], %%eax\n\t" \
FEP "loop 1b\n\t" \
FEP "mov %%edi, %%ecx\n\t" \
FEP "xor %%eax, %%eax\n\t" \
FEP "xor %%edx, %%edx\n\t" \
"wrmsr\n\t" \
:: "a"((uint32_t)_value), "d"(_value >> 32), \
- "c"(_msr), "D"(_msr) \
+ "c"(_msr), "D"(_msr), [m]"m"(kvm_pmu_version) \
); \
} while (0)
@@ -177,9 +178,9 @@ do { \
wrmsr(pmc_msr, 0); \
\
if (this_cpu_has(X86_FEATURE_CLFLUSHOPT)) \
- GUEST_MEASURE_EVENT(_ctrl_msr, _value, "clflushopt .", FEP); \
+ GUEST_MEASURE_EVENT(_ctrl_msr, _value, "clflushopt %[m]", FEP); \
else if (this_cpu_has(X86_FEATURE_CLFLUSH)) \
- GUEST_MEASURE_EVENT(_ctrl_msr, _value, "clflush .", FEP); \
+ GUEST_MEASURE_EVENT(_ctrl_msr, _value, "clflush %[m]", FEP); \
else \
GUEST_MEASURE_EVENT(_ctrl_msr, _value, "nop", FEP); \
\
In the PMU counters test, add a data load in the measured loop and target the data with CLFLUSH{OPT} in order to (try to) guarantee the loop generates LLC misses and fills. Per the SDM, some hardware prefetchers are allowed to omit relevant PMU events, and Emerald Rapids (and possibly Sapphire Rapids) appears to have gained an instruction prefetcher that bypasses event counts. E.g. the test will consistently fail on EMR CPUs, but then pass with seemingly benign changes to the code. The event count includes speculation and cache line fills due to the first-level cache hardware prefetcher, but may exclude cache line fills due to other hardware-prefetchers. Generate a data load as a last ditch effort to preserve the (minimal) test coverage for LLC references and misses. Cc: Maxim Levitsky <mlevitsk@redhat.com> Signed-off-by: Sean Christopherson <seanjc@google.com> --- As alluded to in the changelog, if the test continues to be flaky after this, I'm inclined to remove the checks for LLC references/misses. tools/testing/selftests/kvm/x86_64/pmu_counters_test.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) base-commit: 4d911c7abee56771b0219a9fbf0120d06bdc9c14