commit d98ecda (arm64: perf: Count EL2 events if the kernel is running in HYP)
is returning error for perf syscall with mixed attribute set for exclude_kernel
and exlude_hv.
This change is breaking some applications (observed with hhvm) when
ran with VHE enabled. Adding change to enable EL2 event counting,
if either of or both of exclude_kernel and exlude_hv are not set.
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulka...@cavium.com>
---
arch/arm64/kernel/perf_event.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index daf95919..ea5848a 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -871,15 +871,20 @@ static int armv8pmu_set_event_filter(struct hw_perf_event
*event,
if (attr->exclude_idle)
return -EPERM;
- if (is_kernel_in_hyp_mode() &&
- attr->exclude_kernel != attr->exclude_hv)
- return -EINVAL;
+ if (is_kernel_in_hyp_mode()) {
+ /* include EL2 events, if either of not excluded */
+ if ((attr->exclude_kernel != attr->exclude_hv) ||
+ !attr->exclude_kernel ||
+ !attr->exclude_hv)
+ config_base |= ARMV8_PMU_INCLUDE_EL2;
+ } else {
+ if (attr->exclude_kernel)
+ config_base |= ARMV8_PMU_EXCLUDE_EL1;
+ if (!attr->exclude_hv)
+ config_base |= ARMV8_PMU_INCLUDE_EL2;
+ }
if (attr->exclude_user)
config_base |= ARMV8_PMU_EXCLUDE_EL0;
- if (!is_kernel_in_hyp_mode() && attr->exclude_kernel)
- config_base |= ARMV8_PMU_EXCLUDE_EL1;
- if (!attr->exclude_hv)
- config_base |= ARMV8_PMU_INCLUDE_EL2;
/*
* Install the filter into config_base as this is used to
--
1.8.1.4
