KVM: s390: get rid of gmap_translate()

Add gpa_to_hva(), which uses memslots, and use it to replace all uses
of gmap_translate().

Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Link: https://lore.kernel.org/r/20250123144627.312456-9-imbrenda@linux.ibm.com
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20250123144627.312456-9-imbrenda@linux.ibm.com>

Author: Claudio Imbrenda

arch/s390/include/asm/gmap.h

@@ -111,7 +111,6 @@ int gmap_map_segment(struct gmap *gmap, unsigned long from,
 		     unsigned long to, unsigned long len);
 int gmap_unmap_segment(struct gmap *gmap, unsigned long to, unsigned long len);
 unsigned long __gmap_translate(struct gmap *, unsigned long gaddr);
-unsigned long gmap_translate(struct gmap *, unsigned long gaddr);
 int __gmap_link(struct gmap *gmap, unsigned long gaddr, unsigned long vmaddr);
 void gmap_discard(struct gmap *, unsigned long from, unsigned long to);
 void __gmap_zap(struct gmap *, unsigned long gaddr);

arch/s390/kvm/interrupt.c

@@ -2893,22 +2893,25 @@ int kvm_set_routing_entry(struct kvm *kvm,
 			  struct kvm_kernel_irq_routing_entry *e,
 			  const struct kvm_irq_routing_entry *ue)
 {
-	u64 uaddr;
+	u64 uaddr_s, uaddr_i;
+	int idx;
 
 	switch (ue->type) {
 	/* we store the userspace addresses instead of the guest addresses */
 	case KVM_IRQ_ROUTING_S390_ADAPTER:
 		if (kvm_is_ucontrol(kvm))
 			return -EINVAL;
 		e->set = set_adapter_int;
-		uaddr =  gmap_translate(kvm->arch.gmap, ue->u.adapter.summary_addr);
-		if (uaddr == -EFAULT)
-			return -EFAULT;
-		e->adapter.summary_addr = uaddr;
-		uaddr =  gmap_translate(kvm->arch.gmap, ue->u.adapter.ind_addr);
-		if (uaddr == -EFAULT)
+
+		idx = srcu_read_lock(&kvm->srcu);
+		uaddr_s = gpa_to_hva(kvm, ue->u.adapter.summary_addr);
+		uaddr_i = gpa_to_hva(kvm, ue->u.adapter.ind_addr);
+		srcu_read_unlock(&kvm->srcu, idx);
+
+		if (kvm_is_error_hva(uaddr_s) || kvm_is_error_hva(uaddr_i))
 			return -EFAULT;
-		e->adapter.ind_addr = uaddr;
+		e->adapter.summary_addr = uaddr_s;
+		e->adapter.ind_addr = uaddr_i;
 		e->adapter.summary_offset = ue->u.adapter.summary_offset;
 		e->adapter.ind_offset = ue->u.adapter.ind_offset;
 		e->adapter.adapter_id = ue->u.adapter.adapter_id;

arch/s390/kvm/kvm-s390.h

@@ -281,6 +281,15 @@ static inline u32 kvm_s390_get_gisa_desc(struct kvm *kvm)
 	return gd;
 }
 
+static inline hva_t gpa_to_hva(struct kvm *kvm, gpa_t gpa)
+{
+	hva_t hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
+
+	if (!kvm_is_error_hva(hva))
+		hva |= offset_in_page(gpa);
+	return hva;
+}
+
 /* implemented in pv.c */
 int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);
 int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);

arch/s390/mm/gmap.c

@@ -463,26 +463,6 @@ unsigned long __gmap_translate(struct gmap *gmap, unsigned long gaddr)
 }
 EXPORT_SYMBOL_GPL(__gmap_translate);
 
-/**
- * gmap_translate - translate a guest address to a user space address
- * @gmap: pointer to guest mapping meta data structure
- * @gaddr: guest address
- *
- * Returns user space address which corresponds to the guest address or
- * -EFAULT if no such mapping exists.
- * This function does not establish potentially missing page table entries.
- */
-unsigned long gmap_translate(struct gmap *gmap, unsigned long gaddr)
-{
-	unsigned long rc;
-
-	mmap_read_lock(gmap->mm);
-	rc = __gmap_translate(gmap, gaddr);
-	mmap_read_unlock(gmap->mm);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(gmap_translate);
-
 /**
  * gmap_unlink - disconnect a page table from the gmap shadow tables
  * @mm: pointer to the parent mm_struct