Mask off reserved bits when stuffing PMCs with full-width writes in the
forced emulation subtest, otherwise the test may fail due to attempting
to set reserved bits.
Cc: Like Xu <like.xu.linux@xxxxxxxxx>
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
x86/pmu.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/x86/pmu.c b/x86/pmu.c
index 72c2c9cf..d92bd8ad 100644
--- a/x86/pmu.c
+++ b/x86/pmu.c
@@ -498,6 +498,11 @@ static void check_emulated_instr(void)
brnch_start = -EXPECTED_BRNCH;
instr_start = -EXPECTED_INSTR;
+
+ if (pmu_use_full_writes()) {
+ brnch_start &= (1ull << pmu.gp_counter_width) - 1;
+ instr_start &= (1ull << pmu.gp_counter_width) - 1;
+ }
wrmsr(MSR_GP_COUNTERx(0), brnch_start);
wrmsr(MSR_GP_COUNTERx(1), instr_start);
// KVM_FEP is a magic prefix that forces emulation so
base-commit: 02d8befe99f8205d4caea402d8b0800354255681
--
2.41.0.162.gfafddb0af9-goog
