KVM: x86/mmu: rename try_async_pf to kvm_faultin_pfn

try_async_pf is a wrong name for this function, since this code
is used when asynchronous page fault is not enabled as well.

This code is based on a patch from Sean Christopherson:
https://lkml.org/lkml/2021/7/19/2970Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210810205251.424103-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -3884,7 +3884,7 @@ static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 				  kvm_vcpu_gfn_to_hva(vcpu, gfn), &arch);
 }
 
-static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
+static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
 			 gpa_t cr2_or_gpa, kvm_pfn_t *pfn, hva_t *hva,
 			 bool write, bool *writable)
 {
@@ -3954,7 +3954,7 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
 
-	if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, &hva,
+	if (kvm_faultin_pfn(vcpu, prefault, gfn, gpa, &pfn, &hva,
 			 write, &map_writable))
 		return RET_PF_RETRY;
 

arch/x86/kvm/mmu/paging_tmpl.h

@@ -881,7 +881,7 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gpa_t addr, u32 error_code,
 	mmu_seq = vcpu->kvm->mmu_notifier_seq;
 	smp_rmb();
 
-	if (try_async_pf(vcpu, prefault, walker.gfn, addr, &pfn, &hva,
+	if (kvm_faultin_pfn(vcpu, prefault, walker.gfn, addr, &pfn, &hva,
 			 write_fault, &map_writable))
 		return RET_PF_RETRY;