Hey Atish,
On Thu, Dec 15, 2022 at 09:00:40AM -0800, Atish Patra wrote:
> RISC-V: KVM: Improve privilege mode filtering for perf
I almost marked this as "not applicable" in patchwork as I was mislead
by the $subject. I know our perf driver is a real mixed bag, but should
it not be something more like:
"perf: RISC-V: Improve privilege mode filtering for KVM"?
It was only when I noticed that the rest of the series had been marked
as "Handled Elsewhere" that I realised that this must not be a KVM patch
;)
Thanks,
Conor
> Currently, the host driver doesn't have any method to identify if the
> requested perf event is from kvm or bare metal. As KVM runs in HS
> mode, there are no separate hypervisor privilege mode to distinguish
> between the attributes for guest/host.
>
> Improve the privilege mode filtering by using the event specific
> config1 field.
>
> Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
> Signed-off-by: Atish Patra <atishp@xxxxxxxxxxxx>
> ---
> drivers/perf/riscv_pmu_sbi.c | 27 ++++++++++++++++++++++-----
> include/linux/perf/riscv_pmu.h | 2 ++
> 2 files changed, 24 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index 65d4aa4..df795b7 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -298,6 +298,27 @@ int riscv_pmu_get_hpm_info(u32 *hw_ctr_width, u32 *num_hw_ctr)
> }
> EXPORT_SYMBOL(riscv_pmu_get_hpm_info);
>
> +static unsigned long pmu_sbi_get_filter_flags(struct perf_event *event)
> +{
> + unsigned long cflags = 0;
> + bool guest_events = false;
> +
> + if (event->attr.config1 & RISCV_KVM_PMU_CONFIG1_GUEST_EVENTS)
> + guest_events = true;
> + if (event->attr.exclude_kernel)
> + cflags |= guest_events ? SBI_PMU_CFG_FLAG_SET_VSINH : SBI_PMU_CFG_FLAG_SET_SINH;
> + if (event->attr.exclude_user)
> + cflags |= guest_events ? SBI_PMU_CFG_FLAG_SET_VUINH : SBI_PMU_CFG_FLAG_SET_UINH;
> + if (guest_events && event->attr.exclude_hv)
> + cflags |= SBI_PMU_CFG_FLAG_SET_SINH;
> + if (event->attr.exclude_host)
> + cflags |= SBI_PMU_CFG_FLAG_SET_UINH | SBI_PMU_CFG_FLAG_SET_SINH;
> + if (event->attr.exclude_guest)
> + cflags |= SBI_PMU_CFG_FLAG_SET_VSINH | SBI_PMU_CFG_FLAG_SET_VUINH;
> +
> + return cflags;
> +}
> +
> static int pmu_sbi_ctr_get_idx(struct perf_event *event)
> {
> struct hw_perf_event *hwc = &event->hw;
> @@ -308,11 +329,7 @@ static int pmu_sbi_ctr_get_idx(struct perf_event *event)
> uint64_t cbase = 0;
> unsigned long cflags = 0;
>
> - if (event->attr.exclude_kernel)
> - cflags |= SBI_PMU_CFG_FLAG_SET_SINH;
> - if (event->attr.exclude_user)
> - cflags |= SBI_PMU_CFG_FLAG_SET_UINH;
> -
> + cflags = pmu_sbi_get_filter_flags(event);
> /* retrieve the available counter index */
> #if defined(CONFIG_32BIT)
> ret = sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_CFG_MATCH, cbase,
> diff --git a/include/linux/perf/riscv_pmu.h b/include/linux/perf/riscv_pmu.h
> index a1c3f77..1c42146 100644
> --- a/include/linux/perf/riscv_pmu.h
> +++ b/include/linux/perf/riscv_pmu.h
> @@ -26,6 +26,8 @@
>
> #define RISCV_PMU_STOP_FLAG_RESET 1
>
> +#define RISCV_KVM_PMU_CONFIG1_GUEST_EVENTS 0x1
> +
> struct cpu_hw_events {
> /* currently enabled events */
> int n_events;
> --
> 2.25.1
>
>
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