linux-kernel - [PATCH V7 02/18] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server

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Message-Id: <20210622094306.8336-3-lingshan.zhu@intel.com>
Date:   Tue, 22 Jun 2021 17:42:50 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     peterz@...radead.org, pbonzini@...hat.com
Cc:     bp@...en8.de, seanjc@...gle.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        weijiang.yang@...el.com, kan.liang@...ux.intel.com,
        ak@...ux.intel.com, wei.w.wang@...el.com, eranian@...gle.com,
        liuxiangdong5@...wei.com, linux-kernel@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org, like.xu.linux@...il.com,
        Like Xu <like.xu@...ux.intel.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH V7 02/18] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server

From: Like Xu <like.xu@...ux.intel.com>

The new hardware facility supporting guest PEBS is only available
on Intel Ice Lake Server platforms for now. KVM will check this field
through perf_get_x86_pmu_capability() instead of hard coding the cpu
models in the KVM code. If it is supported, the guest PEBS capability
will be exposed to the guest.

Signed-off-by: Like Xu <like.xu@...ux.intel.com>
Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
---
 arch/x86/events/core.c            | 1 +
 arch/x86/events/intel/core.c      | 1 +
 arch/x86/events/perf_event.h      | 3 ++-
 arch/x86/include/asm/perf_event.h | 1 +
 4 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index c71af4cfba9b..67eb5983bf80 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2984,5 +2984,6 @@ void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
 	cap->bit_width_fixed	= x86_pmu.cntval_bits;
 	cap->events_mask	= (unsigned int)x86_pmu.events_maskl;
 	cap->events_mask_len	= x86_pmu.events_mask_len;
+	cap->pebs_vmx		= x86_pmu.pebs_vmx;
 }
 EXPORT_SYMBOL_GPL(perf_get_x86_pmu_capability);
diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 430f5743f3ca..211b3767d7e6 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -6027,6 +6027,7 @@ __init int intel_pmu_init(void)
 
 	case INTEL_FAM6_ICELAKE_X:
 	case INTEL_FAM6_ICELAKE_D:
+		x86_pmu.pebs_vmx = 1;
 		pmem = true;
 		fallthrough;
 	case INTEL_FAM6_ICELAKE_L:
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index ad87cb36f7c8..d0634b142376 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -796,7 +796,8 @@ struct x86_pmu {
 			pebs_prec_dist		:1,
 			pebs_no_tlb		:1,
 			pebs_no_isolation	:1,
-			pebs_block		:1;
+			pebs_block		:1,
+			pebs_vmx		:1;
 	int		pebs_record_size;
 	int		pebs_buffer_size;
 	int		max_pebs_events;
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 544f41a179fb..6a6e707905be 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -192,6 +192,7 @@ struct x86_pmu_capability {
 	int		bit_width_fixed;
 	unsigned int	events_mask;
 	int		events_mask_len;
+	unsigned int	pebs_vmx	:1;
 };
 
 /*
-- 
2.27.0