diff mbox series

[RFC,v3,39/58] KVM: x86/pmu: Notify perf core at KVM context switch boundary

Message ID 20240801045907.4010984-40-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: Xiong Zhang <xiong.y.zhang@linux.intel.com>

Before restore guest PMU context, call perf_guest_enter() to let perf core
sched out all exclude_guest perf events and switch PMI to dedicated
KVM_GUEST_PMI_VECTOR.

After save guest PMU context, call perf_guest_exit() to let perf core
switch PMI back to NMI and sched in exclude_guest perf events.

Signed-off-by: Xiong Zhang <xiong.y.zhang@linux.intel.com>
Tested-by: Yongwei Ma <yongwei.ma@intel.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
 arch/x86/kvm/pmu.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index 545930f743b9..5cc539bdcc7e 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -1097,6 +1097,8 @@  void kvm_pmu_save_pmu_context(struct kvm_vcpu *vcpu)
 		if (pmc->counter)
 			wrmsrl(pmc->msr_counter, 0);
 	}
+
+	perf_guest_exit();
 }
 
 void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu)
@@ -1107,6 +1109,8 @@  void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu)
 
 	lockdep_assert_irqs_disabled();
 
+	perf_guest_enter(kvm_lapic_get_reg(vcpu->arch.apic, APIC_LVTPC));
+
 	static_call_cond(kvm_x86_pmu_restore_pmu_context)(vcpu);
 
 	/*