diff mbox series

[RFC,30/41] KVM: x86/pmu: Switch PMI handler at KVM context switch boundary

Message ID 20240126085444.324918-31-xiong.y.zhang@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86/pmu: Introduce passthrough vPM | expand

Commit Message

Xiong Zhang Jan. 26, 2024, 8:54 a.m. UTC 
From: Xiong Zhang <xiong.y.zhang@intel.com>

Switch PMI handler at KVM context switch boundary because KVM uses a
separate maskable interrupt vector other than the NMI handler for the host
PMU to process its own PMIs.  So invoke the perf API that allows
registration of the PMI handler.

Signed-off-by: Xiong Zhang <xiong.y.zhang@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 9d737f5b96bf..cd559fd74f65 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -904,11 +904,15 @@  void kvm_pmu_save_pmu_context(struct kvm_vcpu *vcpu)
 	lockdep_assert_irqs_disabled();
 
 	static_call_cond(kvm_x86_pmu_save_pmu_context)(vcpu);
+
+	perf_guest_switch_to_host_pmi_vector();
 }
 
 void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu)
 {
 	lockdep_assert_irqs_disabled();
 
+	perf_guest_switch_to_kvm_pmi_vector(kvm_lapic_get_lvtpc_mask(vcpu));
+
 	static_call_cond(kvm_x86_pmu_restore_pmu_context)(vcpu);
 }