[PATCH v2 12/13] KVM: arm64: Convert to the generic perf callbacks

[Sean Christopherson]

Drop arm64's version of the callbacks in favor of the callbacks provided
by generic KVM, which are semantically identical.  Implement the "get ip"
hook as needed.

Signed-off-by: Sean Christopherson <seanjc at google.com>
---
 arch/arm64/include/asm/kvm_host.h | 12 +++++++++++
 arch/arm64/kvm/arm.c              |  5 +++++
 arch/arm64/kvm/perf.c             | 34 ++-----------------------------
 3 files changed, 19 insertions(+), 32 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index ed940aec89e0..73dc402ded1f 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -673,6 +673,18 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa);
 void kvm_perf_init(void);
 void kvm_perf_teardown(void);
 
+#ifdef CONFIG_PERF_EVENTS
+#define __KVM_WANT_PERF_CALLBACKS
+static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
+{
+	/* Any callback while a vCPU is loaded is considered to be in guest. */
+	return !!vcpu;
+}
+#else
+static inline void kvm_register_perf_callbacks(void) {}
+static inline void kvm_unregister_perf_callbacks(void) {}
+#endif
+
 long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu);
 gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu);
 void kvm_update_stolen_time(struct kvm_vcpu *vcpu);
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index e9a2b8f27792..2b542fdc237e 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -500,6 +500,11 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
 	return vcpu_mode_priv(vcpu);
 }
 
+unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
+{
+	return *vcpu_pc(vcpu);
+}
+
 /* Just ensure a guest exit from a particular CPU */
 static void exit_vm_noop(void *info)
 {
diff --git a/arch/arm64/kvm/perf.c b/arch/arm64/kvm/perf.c
index 893de1a51fea..0b902e0d5b5d 100644
--- a/arch/arm64/kvm/perf.c
+++ b/arch/arm64/kvm/perf.c
@@ -13,45 +13,15 @@
 
 DEFINE_STATIC_KEY_FALSE(kvm_arm_pmu_available);
 
-static unsigned int kvm_guest_state(void)
-{
-	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
-	unsigned int state;
-
-	if (!vcpu)
-		return 0;
-
-	state = PERF_GUEST_ACTIVE;
-	if (!vcpu_mode_priv(vcpu))
-		state |= PERF_GUEST_USER;
-
-	return state;
-}
-
-static unsigned long kvm_get_guest_ip(void)
-{
-	struct kvm_vcpu *vcpu = kvm_get_running_vcpu();
-
-	if (WARN_ON_ONCE(!vcpu))
-		return 0;
-
-	return *vcpu_pc(vcpu);
-}
-
-static struct perf_guest_info_callbacks kvm_guest_cbs = {
-	.state		= kvm_guest_state,
-	.get_ip		= kvm_get_guest_ip,
-};
-
 void kvm_perf_init(void)
 {
 	if (kvm_pmu_probe_pmuver() != 0xf && !is_protected_kvm_enabled())
 		static_branch_enable(&kvm_arm_pmu_available);
 
-	perf_register_guest_info_callbacks(&kvm_guest_cbs);
+	kvm_register_perf_callbacks(NULL);
 }
 
 void kvm_perf_teardown(void)
 {
-	perf_unregister_guest_info_callbacks();
+	kvm_unregister_perf_callbacks();
 }
-- 
2.33.0.259.gc128427fd7-goog