[PATCH v4.1] arm64: perf: Count EL2 events if the kernel is running in HYP
From: Marc Zyngier <hidden>
Date: 2016-02-17 17:57:58
Also in:
kvm, kvmarm, lkml
Subsystem:
arm pmu profiling and debugging, arm64 port (aarch64 architecture), performance events subsystem, the rest · Maintainers:
Will Deacon, Mark Rutland, Catalin Marinas, Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
When the kernel is running in HYP (with VHE), it is necessary to include EL2 events if the user requests counting kernel or hypervisor events. Reviewed-by: Christoffer Dall <redacted> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <redacted> --- arch/arm64/kernel/perf_event.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index f7ab14c..1b52269 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c@@ -20,6 +20,7 @@ */ #include <asm/irq_regs.h> +#include <asm/virt.h> #include <linux/of.h> #include <linux/perf/arm_pmu.h>
@@ -691,9 +692,12 @@ 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 (attr->exclude_user) config_base |= ARMV8_EXCLUDE_EL0; - if (attr->exclude_kernel) + if (!is_kernel_in_hyp_mode() && attr->exclude_kernel) config_base |= ARMV8_EXCLUDE_EL1; if (!attr->exclude_hv) config_base |= ARMV8_INCLUDE_EL2;
--
2.1.4