* [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM
@ 2026-06-02 12:17 Gautam Menghani
2026-06-02 17:11 ` Harsh Prateek Bora
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Gautam Menghani @ 2026-06-02 12:17 UTC (permalink / raw)
To: maddy, mpe, npiggin, chleroy
Cc: Gautam Menghani, linuxppc-dev, linux-kernel, harshpb, stable,
Sean Christopherson
Currently, CONFIG_VPA_PMU is not enabled by default, and consequently
cannot be used for KVM guests at all, unless explicitly enabled on
host kernel.
Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is
being used.
Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters")
Cc: stable@vger•kernel.org # v6.13+
Suggested-by: Sean Christopherson <seanjc@google•com>
Signed-off-by: Gautam Menghani <gautam@linux•ibm.com>
---
v3 -> v4:
1. Reword the patch description (Harsh)
v2 -> v3:
1. Make CONFIG_VPA_PMU as default m so that it can separately disabled
(Sean)
v1 -> v2:
1. Rebased on latest master
arch/powerpc/platforms/pseries/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index f7052b131a4c..74910ce3a541 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -154,6 +154,7 @@ config HV_PERF_CTRS
config VPA_PMU
tristate "VPA PMU events"
depends on KVM_BOOK3S_64_HV && HV_PERF_CTRS
+ default m
help
Enable access to the VPA PMU counters via perf. This enables
code that support measurement for KVM on PowerVM(KoP) feature.
--
2.53.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM
2026-06-02 12:17 [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM Gautam Menghani
@ 2026-06-02 17:11 ` Harsh Prateek Bora
2026-06-02 19:04 ` Amit Machhiwal
2026-06-06 3:07 ` Ritesh Harjani
2 siblings, 0 replies; 4+ messages in thread
From: Harsh Prateek Bora @ 2026-06-02 17:11 UTC (permalink / raw)
To: Gautam Menghani, maddy, mpe, npiggin, chleroy
Cc: linuxppc-dev, linux-kernel, stable, Sean Christopherson
On 02/06/26 5:47 pm, Gautam Menghani wrote:
> Currently, CONFIG_VPA_PMU is not enabled by default, and consequently
> cannot be used for KVM guests at all, unless explicitly enabled on
> host kernel.
>
> Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is
> being used.
>
> Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters")
> Cc: stable@vger•kernel.org # v6.13+
> Suggested-by: Sean Christopherson <seanjc@google•com>
> Signed-off-by: Gautam Menghani <gautam@linux•ibm.com>
> ---
> v3 -> v4:
> 1. Reword the patch description (Harsh)
>
Reviewed-by: Harsh Prateek Bora <harshpb@linux•ibm.com>
> v2 -> v3:
> 1. Make CONFIG_VPA_PMU as default m so that it can separately disabled
> (Sean)
>
> v1 -> v2:
> 1. Rebased on latest master
>
> arch/powerpc/platforms/pseries/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
> index f7052b131a4c..74910ce3a541 100644
> --- a/arch/powerpc/platforms/pseries/Kconfig
> +++ b/arch/powerpc/platforms/pseries/Kconfig
> @@ -154,6 +154,7 @@ config HV_PERF_CTRS
> config VPA_PMU
> tristate "VPA PMU events"
> depends on KVM_BOOK3S_64_HV && HV_PERF_CTRS
> + default m
> help
> Enable access to the VPA PMU counters via perf. This enables
> code that support measurement for KVM on PowerVM(KoP) feature.
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM
2026-06-02 12:17 [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM Gautam Menghani
2026-06-02 17:11 ` Harsh Prateek Bora
@ 2026-06-02 19:04 ` Amit Machhiwal
2026-06-06 3:07 ` Ritesh Harjani
2 siblings, 0 replies; 4+ messages in thread
From: Amit Machhiwal @ 2026-06-02 19:04 UTC (permalink / raw)
To: Gautam Menghani
Cc: maddy, mpe, npiggin, chleroy, linuxppc-dev, linux-kernel, harshpb,
stable, Sean Christopherson
On 2026/06/02 05:47 PM, Gautam Menghani wrote:
> Currently, CONFIG_VPA_PMU is not enabled by default, and consequently
> cannot be used for KVM guests at all, unless explicitly enabled on
> host kernel.
>
> Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is
> being used.
>
> Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters")
> Cc: stable@vger•kernel.org # v6.13+
> Suggested-by: Sean Christopherson <seanjc@google•com>
> Signed-off-by: Gautam Menghani <gautam@linux•ibm.com>
> ---
> v3 -> v4:
> 1. Reword the patch description (Harsh)
>
> v2 -> v3:
> 1. Make CONFIG_VPA_PMU as default m so that it can separately disabled
> (Sean)
>
> v1 -> v2:
> 1. Rebased on latest master
>
> arch/powerpc/platforms/pseries/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
> index f7052b131a4c..74910ce3a541 100644
> --- a/arch/powerpc/platforms/pseries/Kconfig
> +++ b/arch/powerpc/platforms/pseries/Kconfig
> @@ -154,6 +154,7 @@ config HV_PERF_CTRS
> config VPA_PMU
> tristate "VPA PMU events"
> depends on KVM_BOOK3S_64_HV && HV_PERF_CTRS
> + default m
LGTM.
Reviewed-by: Amit Machhiwal <amachhiw@linux•ibm.com>
Thanks,
Amit
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM
2026-06-02 12:17 [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM Gautam Menghani
2026-06-02 17:11 ` Harsh Prateek Bora
2026-06-02 19:04 ` Amit Machhiwal
@ 2026-06-06 3:07 ` Ritesh Harjani
2 siblings, 0 replies; 4+ messages in thread
From: Ritesh Harjani @ 2026-06-06 3:07 UTC (permalink / raw)
To: Gautam Menghani, maddy, mpe, npiggin, chleroy
Cc: Gautam Menghani, linuxppc-dev, linux-kernel, harshpb, stable,
Sean Christopherson
Gautam Menghani <gautam@linux•ibm.com> writes:
> Currently, CONFIG_VPA_PMU is not enabled by default, and consequently
> cannot be used for KVM guests at all, unless explicitly enabled on
> host kernel.
>
> Mark CONFIG_VPA_PMU as "default m" to ensure it is available when KVM is
> being used.
>
> Fixes: 176cda0619b6c ("powerpc/perf: Add perf interface to expose vpa counters")
Not really a fix per-se. So we need not add this fixes tag.
> Cc: stable@vger•kernel.org # v6.13+
I think the stable tag like above is sufficient for stable tree
maintainers to pick this up.
-ritesh
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2026-06-06 3:22 UTC | newest]
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2026-06-02 12:17 [PATCH v4] powerpc/pseries/Kconfig: Enable CONFIG_VPA_PMU to be used with KVM Gautam Menghani
2026-06-02 17:11 ` Harsh Prateek Bora
2026-06-02 19:04 ` Amit Machhiwal
2026-06-06 3:07 ` Ritesh Harjani
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