[RFC PATCH 32/41] KVM: x86/pmu: Add support for PMU context switch at VM-exit/enter

[Xiong Zhang]

From: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>

Add correct PMU context switch at VM_entry/exit boundary.

Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxx>
Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 074452aa700d..fe7da1a16c3b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10898,6 +10898,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		set_debugreg(0, 7);
 	}
 
+	if (is_passthrough_pmu_enabled(vcpu))
+		kvm_pmu_restore_pmu_context(vcpu);
+
 	guest_timing_enter_irqoff();
 
 	for (;;) {
@@ -10926,6 +10929,9 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		++vcpu->stat.exits;
 	}
 
+	if (is_passthrough_pmu_enabled(vcpu))
+		kvm_pmu_save_pmu_context(vcpu);
+
 	/*
 	 * Do this here before restoring debug registers on the host.  And
 	 * since we do this before handling the vmexit, a DR access vmexit
-- 
2.34.1