The following commit has been merged into the perf/core branch of tip:

Commit-ID:     c8824a95d9673763a0a9d642f8c79b2162296923
Gitweb:        https://git.kernel.org/tip/c8824a95d9673763a0a9d642f8c79b2162296923
Author:        Mingwei Zhang <mizhang@google.com>
AuthorDate:    Fri, 05 Dec 2025 16:16:47 -08:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Wed, 17 Dec 2025 13:31:06 +01:00

perf/x86/core: Plumb mediated PMU capability from x86_pmu to x86_pmu_cap

Plumb mediated PMU capability to x86_pmu_cap in order to let any kernel
entity such as KVM know that host PMU support mediated PMU mode and has
the implementation.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Xudong Hao <xudong.hao@intel.com>
Link: https://patch.msgid.link/20251206001720.468579-12-seanjc@google.com
---
 arch/x86/events/core.c            | 1 +
 arch/x86/include/asm/perf_event.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 3f78388..df7a32b 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -3110,6 +3110,7 @@ void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
 	cap->events_mask	= (unsigned int)x86_pmu.events_maskl;
 	cap->events_mask_len	= x86_pmu.events_mask_len;
 	cap->pebs_ept		= x86_pmu.pebs_ept;
+	cap->mediated		= !!(pmu.capabilities & PERF_PMU_CAP_MEDIATED_VPMU);
 }
 EXPORT_SYMBOL_FOR_KVM(perf_get_x86_pmu_capability);
 
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index fb7b261..0d9af41 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -301,6 +301,7 @@ struct x86_pmu_capability {
 	unsigned int	events_mask;
 	int		events_mask_len;
 	unsigned int	pebs_ept	:1;
+	unsigned int	mediated	:1;
 };
 
 /*