KVM: Remove obsolete kvm_unmap_hva notifier backend

kvm_unmap_hva is long gone, and we only have kvm_unmap_hva_range to
deal with. Drop the now obsolete code.

Fixes: fb1522e0 ("KVM: update to new mmu_notifier semantic v2")
Cc: James Hogan <jhogan@kernel.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>

arch/arm/include/asm/kvm_host.h

@@ -223,7 +223,6 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end);
 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

arch/arm64/include/asm/kvm_host.h

@@ -357,7 +357,6 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 			      struct kvm_vcpu_events *events);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end);
 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

arch/mips/include/asm/kvm_host.h

@@ -931,7 +931,6 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
 						   bool write);
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end);
 void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);

arch/mips/kvm/mmu.c

@@ -512,16 +512,6 @@ static int kvm_unmap_hva_handler(struct kvm *kvm, gfn_t gfn, gfn_t gfn_end,
 	return 1;
 }
 
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
-{
-	unsigned long end = hva + PAGE_SIZE;
-
-	handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
-
-	kvm_mips_callbacks->flush_shadow_all(kvm);
-	return 0;
-}
-
 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
 {
 	handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL);

arch/x86/include/asm/kvm_host.h

@@ -1450,7 +1450,6 @@ asmlinkage void kvm_spurious_fault(void);
 	____kvm_handle_fault_on_reboot(insn, "")
 
 #define KVM_ARCH_WANT_MMU_NOTIFIER
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);

arch/x86/kvm/mmu.c

@@ -1853,11 +1853,6 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva,
 	return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler);
 }
 
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
-{
-	return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp);
-}
-
 int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end)
 {
 	return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp);

virt/kvm/arm/mmu.c

@@ -1817,18 +1817,6 @@ static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *dat
 	return 0;
 }
 
-int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)
-{
-	unsigned long end = hva + PAGE_SIZE;
-
-	if (!kvm->arch.pgd)
-		return 0;
-
-	trace_kvm_unmap_hva(hva);
-	handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL);
-	return 0;
-}
-
 int kvm_unmap_hva_range(struct kvm *kvm,
 			unsigned long start, unsigned long end)
 {

virt/kvm/arm/trace.h

@@ -134,21 +134,6 @@ TRACE_EVENT(kvm_mmio_emulate,
 		  __entry->vcpu_pc, __entry->instr, __entry->cpsr)
 );
 
-TRACE_EVENT(kvm_unmap_hva,
-	TP_PROTO(unsigned long hva),
-	TP_ARGS(hva),
-
-	TP_STRUCT__entry(
-		__field(	unsigned long,	hva		)
-	),
-
-	TP_fast_assign(
-		__entry->hva		= hva;
-	),
-
-	TP_printk("mmu notifier unmap hva: %#08lx", __entry->hva)
-);
-
 TRACE_EVENT(kvm_unmap_hva_range,
 	TP_PROTO(unsigned long start, unsigned long end),
 	TP_ARGS(start, end),