[PATCH v2 29/54] KVM: x86/pmu: Introduce PMU operation prototypes for save/restore PMU context

[Mingwei Zhang <mizhang@xxxxxxxxxx>]

Plumb through kvm_pmu_ops with these two extra functions to allow pmu
context switch.

Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
---
 arch/x86/include/asm/kvm-x86-pmu-ops.h |  2 ++
 arch/x86/kvm/pmu.c                     | 14 ++++++++++++++
 arch/x86/kvm/pmu.h                     |  4 ++++
 3 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/kvm-x86-pmu-ops.h b/arch/x86/include/asm/kvm-x86-pmu-ops.h
index 1b7876dcb3c3..1a848ba6a7a7 100644
--- a/arch/x86/include/asm/kvm-x86-pmu-ops.h
+++ b/arch/x86/include/asm/kvm-x86-pmu-ops.h
@@ -25,6 +25,8 @@ KVM_X86_PMU_OP_OPTIONAL(reset)
 KVM_X86_PMU_OP_OPTIONAL(deliver_pmi)
 KVM_X86_PMU_OP_OPTIONAL(cleanup)
 KVM_X86_PMU_OP_OPTIONAL(passthrough_pmu_msrs)
+KVM_X86_PMU_OP_OPTIONAL(save_pmu_context)
+KVM_X86_PMU_OP_OPTIONAL(restore_pmu_context)
 
 #undef KVM_X86_PMU_OP
 #undef KVM_X86_PMU_OP_OPTIONAL
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index e9047051489e..782b564bdf96 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -1065,3 +1065,17 @@ void kvm_pmu_passthrough_pmu_msrs(struct kvm_vcpu *vcpu)
 {
 	static_call_cond(kvm_x86_pmu_passthrough_pmu_msrs)(vcpu);
 }
+
+void kvm_pmu_save_pmu_context(struct kvm_vcpu *vcpu)
+{
+	lockdep_assert_irqs_disabled();
+
+	static_call_cond(kvm_x86_pmu_save_pmu_context)(vcpu);
+}
+
+void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu)
+{
+	lockdep_assert_irqs_disabled();
+
+	static_call_cond(kvm_x86_pmu_restore_pmu_context)(vcpu);
+}
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index 63f876557716..8bd4b79e363f 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -42,6 +42,8 @@ struct kvm_pmu_ops {
 	void (*cleanup)(struct kvm_vcpu *vcpu);
 	bool (*is_rdpmc_passthru_allowed)(struct kvm_vcpu *vcpu);
 	void (*passthrough_pmu_msrs)(struct kvm_vcpu *vcpu);
+	void (*save_pmu_context)(struct kvm_vcpu *vcpu);
+	void (*restore_pmu_context)(struct kvm_vcpu *vcpu);
 
 	const u64 EVENTSEL_EVENT;
 	const int MAX_NR_GP_COUNTERS;
@@ -294,6 +296,8 @@ int kvm_vm_ioctl_set_pmu_event_filter(struct kvm *kvm, void __user *argp);
 void kvm_pmu_trigger_event(struct kvm_vcpu *vcpu, u64 eventsel);
 bool kvm_pmu_check_rdpmc_passthrough(struct kvm_vcpu *vcpu);
 void kvm_pmu_passthrough_pmu_msrs(struct kvm_vcpu *vcpu);
+void kvm_pmu_save_pmu_context(struct kvm_vcpu *vcpu);
+void kvm_pmu_restore_pmu_context(struct kvm_vcpu *vcpu);
 
 bool is_vmware_backdoor_pmc(u32 pmc_idx);
 
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog