KVM: Drop kvm_arch_sync_events() now that all implementations are nops

Remove kvm_arch_sync_events() now that x86 no longer uses it (no other
arch has ever used it).

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-ID: <20250224235542.2562848-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: sean-jc

arch/arm64/include/asm/kvm_host.h

@@ -1334,8 +1334,6 @@ static inline bool kvm_system_needs_idmapped_vectors(void)
 	return cpus_have_final_cap(ARM64_SPECTRE_V3A);
 }
 
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
-
 void kvm_init_host_debug_data(void);
 void kvm_vcpu_load_debug(struct kvm_vcpu *vcpu);
 void kvm_vcpu_put_debug(struct kvm_vcpu *vcpu);

arch/loongarch/include/asm/kvm_host.h

@@ -320,7 +320,6 @@ static inline bool kvm_is_ifetch_fault(struct kvm_vcpu_arch *arch)
 
 /* Misc */
 static inline void kvm_arch_hardware_unsetup(void) {}
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}
 static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) {}

arch/mips/include/asm/kvm_host.h

@@ -886,7 +886,6 @@ extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
 extern int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 			     struct kvm_mips_interrupt *irq);
 
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_free_memslot(struct kvm *kvm,
 					 struct kvm_memory_slot *slot) {}
 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}

arch/powerpc/include/asm/kvm_host.h

@@ -902,7 +902,6 @@ struct kvm_vcpu_arch {
 #define __KVM_HAVE_ARCH_WQP
 #define __KVM_HAVE_CREATE_DEVICE
 
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}
 static inline void kvm_arch_flush_shadow_all(struct kvm *kvm) {}
 static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) {}

arch/riscv/include/asm/kvm_host.h

@@ -301,8 +301,6 @@ static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu)
 	return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
 }
 
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
-
 #define KVM_RISCV_GSTAGE_TLB_MIN_ORDER		12
 
 void kvm_riscv_local_hfence_gvma_vmid_gpa(unsigned long vmid,

arch/s390/include/asm/kvm_host.h

@@ -1056,7 +1056,6 @@ bool kvm_s390_pv_cpu_is_protected(struct kvm_vcpu *vcpu);
 extern int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc);
 extern int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc);
 
-static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 static inline void kvm_arch_free_memslot(struct kvm *kvm,
 					 struct kvm_memory_slot *slot) {}
 static inline void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) {}

arch/x86/kvm/x86.c

@@ -12757,11 +12757,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	return ret;
 }
 
-void kvm_arch_sync_events(struct kvm *kvm)
-{
-
-}
-
 /**
  * __x86_set_memory_region: Setup KVM internal memory slot
  *

include/linux/kvm_host.h

@@ -1746,7 +1746,6 @@ static inline void kvm_unregister_perf_callbacks(void) {}
 
 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
 void kvm_arch_destroy_vm(struct kvm *kvm);
-void kvm_arch_sync_events(struct kvm *kvm);
 
 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
 

virt/kvm/kvm_main.c

@@ -1262,7 +1262,6 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	kvm_destroy_pm_notifier(kvm);
 	kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm);
 	kvm_destroy_vm_debugfs(kvm);
-	kvm_arch_sync_events(kvm);
 	mutex_lock(&kvm_lock);
 	list_del(&kvm->vm_list);
 	mutex_unlock(&kvm_lock);