diff mbox series

[RFC,v3,15/58] perf/x86: Support switch_interrupt interface

Message ID 20240801045907.4010984-16-mizhang@google.com (mailing list archive)
State New, archived
Headers show
Series Mediated Passthrough vPMU 3.0 for x86 | expand

Commit Message

Mingwei Zhang Aug. 1, 2024, 4:58 a.m. UTC 
From: Kan Liang <kan.liang@linux.intel.com>

Implement switch_interrupt 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@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
 arch/x86/events/core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 5bf78cd619bf..b17ef8b6c1a6 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -2673,6 +2673,15 @@  static bool x86_pmu_filter(struct pmu *pmu, int cpu)
 	return ret;
 }
 
+static void x86_pmu_switch_interrupt(bool enter, u32 guest_lvtpc)
+{
+	if (enter)
+		apic_write(APIC_LVTPC, APIC_DM_FIXED | KVM_GUEST_PMI_VECTOR |
+			   (guest_lvtpc & APIC_LVT_MASKED));
+	else
+		apic_write(APIC_LVTPC, APIC_DM_NMI);
+}
+
 static struct pmu pmu = {
 	.pmu_enable		= x86_pmu_enable,
 	.pmu_disable		= x86_pmu_disable,
@@ -2702,6 +2711,8 @@  static struct pmu pmu = {
 	.aux_output_match	= x86_pmu_aux_output_match,
 
 	.filter			= x86_pmu_filter,
+
+	.switch_interrupt	= x86_pmu_switch_interrupt,
 };
 
 void arch_perf_update_userpage(struct perf_event *event,