[RFC PATCH v3 41/58] KVM: x86/pmu: Add support for PMU context switch at VM-exit/enter

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

Add correct PMU context switch at VM_entry/exit boundary.

Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Xiong Zhang <xiong.y.zhang@xxxxxxxxxxxxxxx>
Tested-by: Yongwei Ma <yongwei.ma@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 dd6d2c334d90..70274c0da017 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11050,6 +11050,9 @@ 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 (;;) {
@@ -11078,6 +11081,9 @@ 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
-- 
2.46.0.rc1.232.g9752f9e123-goog





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