linux-kernel - [PATCH v4 10/38] perf/x86: Support switch_guest

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Message-ID: <20250324173121.1275209-11-mizhang@google.com>
Date: Mon, 24 Mar 2025 17:30:50 +0000
From: Mingwei Zhang <mizhang@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, Liang@...gle.com, 
	Kan <kan.liang@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	Mingwei Zhang <mizhang@...gle.com>, Yongwei Ma <yongwei.ma@...el.com>, 
	Xiong Zhang <xiong.y.zhang@...ux.intel.com>, Dapeng Mi <dapeng1.mi@...ux.intel.com>, 
	Jim Mattson <jmattson@...gle.com>, Sandipan Das <sandipan.das@....com>, 
	Zide Chen <zide.chen@...el.com>, Eranian Stephane <eranian@...gle.com>, 
	Das Sandipan <Sandipan.Das@....com>, Shukla Manali <Manali.Shukla@....com>, 
	Nikunj Dadhania <nikunj.dadhania@....com>
Subject: [PATCH v4 10/38] perf/x86: Support switch_guest_ctx interface

From: Kan Liang <kan.liang@...ux.intel.com>

Implement switch_guest_ctx interface for x86 PMU, switch PMI to dedicated
KVM_GUEST_PMI_VECTOR at perf guest enter, and switch PMI back to
NMI at perf guest exit.

Signed-off-by: Xiong Zhang <xiong.y.zhang@...ux.intel.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Tested-by: Yongwei Ma <yongwei.ma@...el.com>
Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
---
 arch/x86/events/core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 8f218ac0d445..28161d6ff26d 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2677,6 +2677,16 @@ static bool x86_pmu_filter(struct pmu *pmu, int cpu)
 	return ret;
 }
 
+static void x86_pmu_switch_guest_ctx(bool enter, void *data)
+{
+	u32 guest_lvtpc = *(u32 *)data;
+
+	if (enter)
+		apic_write(APIC_LVTPC, guest_lvtpc);
+	else
+		apic_write(APIC_LVTPC, APIC_DM_NMI);
+}
+
 static struct pmu pmu = {
 	.pmu_enable		= x86_pmu_enable,
 	.pmu_disable		= x86_pmu_disable,
@@ -2706,6 +2716,8 @@ static struct pmu pmu = {
 	.aux_output_match	= x86_pmu_aux_output_match,
 
 	.filter			= x86_pmu_filter,
+
+	.switch_guest_ctx	= x86_pmu_switch_guest_ctx,
 };
 
 void arch_perf_update_userpage(struct perf_event *event,
-- 
2.49.0.395.g12beb8f557-goog