[PATCH v2 39/54] KVM: x86/pmu: Add support for PMU context switch at VM-exit/enter

Mingwei Zhang
2024-05-06T05:31:42Z

From: Xiong Zhang <xiong.y.zhang@linux.intel.com>

Add correct PMU context switch at VM_entry/exit boundary.

Signed-off-by: Xiong Zhang <xiong.y.zhang@linux.intel.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
---
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 3152587eca5b..733c1acdc8c1 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11009,6 +11009,9 @@ 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 (;;) {
@@ -11037,6 +11040,9 @@ 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
--
2.45.0.rc1.225.g2a3ae87e7f-goog