[PATCH v4 02/16] xen: Use typesafe gfn in xenmem_add_to_physmap_one

[Julien Grall <julien.grall@arm.com>]

The x86 version of the function xenmem_add_to_physmap_one contains
variable name gpfn and gfn which make the code very confusing.
I have left unchanged for now.

Also, rename gpfn to gfn in the ARM version as the latter is the correct
acronym for a guest physical frame.

Finally, remove the trailing whitespace around the changes.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

---
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <george.dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wei.liu2@citrix.com>

    Changes in v4:
        - Add Stefano's Acked-by

    Changes in v3:
        - Add Jan's Acked-by for non-ARM bits
---
 xen/arch/arm/mm.c    | 10 +++++-----
 xen/arch/x86/mm.c    | 15 +++++++--------
 xen/common/memory.c  |  6 +++---
 xen/include/xen/mm.h |  2 +-
 4 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 5ab9b75..6882d54 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1046,7 +1046,7 @@ int xenmem_add_to_physmap_one(
     unsigned int space,
     union xen_add_to_physmap_batch_extra extra,
     unsigned long idx,
-    xen_pfn_t gpfn)
+    gfn_t gfn)
 {
     unsigned long mfn = 0;
     int rc;
@@ -1081,8 +1081,8 @@ int xenmem_add_to_physmap_one(
             else
                 return -EINVAL;
         }
-        
-        d->arch.grant_table_gpfn[idx] = gpfn;
+
+        d->arch.grant_table_gpfn[idx] = gfn_x(gfn);
 
         t = p2m_ram_rw;
 
@@ -1145,7 +1145,7 @@ int xenmem_add_to_physmap_one(
         if ( extra.res0 )
             return -EOPNOTSUPP;
 
-        rc = map_dev_mmio_region(d, gpfn, 1, idx);
+        rc = map_dev_mmio_region(d, gfn_x(gfn), 1, idx);
         return rc;
 
     default:
@@ -1153,7 +1153,7 @@ int xenmem_add_to_physmap_one(
     }
 
     /* Map at new location. */
-    rc = guest_physmap_add_entry(d, _gfn(gpfn), _mfn(mfn), 0, t);
+    rc = guest_physmap_add_entry(d, gfn, _mfn(mfn), 0, t);
 
     /* If we fail to add the mapping, we need to drop the reference we
      * took earlier on foreign pages */
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 7fbc94e..dbcf6cb 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4775,7 +4775,7 @@ int xenmem_add_to_physmap_one(
     unsigned int space,
     union xen_add_to_physmap_batch_extra extra,
     unsigned long idx,
-    xen_pfn_t gpfn)
+    gfn_t gpfn)
 {
     struct page_info *page = NULL;
     unsigned long gfn = 0; /* gcc ... */
@@ -4834,7 +4834,7 @@ int xenmem_add_to_physmap_one(
             break;
         }
         case XENMAPSPACE_gmfn_foreign:
-            return p2m_add_foreign(d, idx, gpfn, extra.foreign_domid);
+            return p2m_add_foreign(d, idx, gfn_x(gpfn), extra.foreign_domid);
         default:
             break;
     }
@@ -4849,19 +4849,18 @@ int xenmem_add_to_physmap_one(
     }
 
     /* Remove previously mapped page if it was present. */
-    prev_mfn = mfn_x(get_gfn(d, gpfn, &p2mt));
+    prev_mfn = mfn_x(get_gfn(d, gfn_x(gpfn), &p2mt));
     if ( mfn_valid(prev_mfn) )
     {
         if ( is_xen_heap_mfn(prev_mfn) )
             /* Xen heap frames are simply unhooked from this phys slot. */
-            guest_physmap_remove_page(d, _gfn(gpfn), _mfn(prev_mfn),
-                                      PAGE_ORDER_4K);
+            guest_physmap_remove_page(d, gpfn, _mfn(prev_mfn), PAGE_ORDER_4K);
         else
             /* Normal domain memory is freed, to avoid leaking memory. */
-            guest_remove_page(d, gpfn);
+            guest_remove_page(d, gfn_x(gpfn));
     }
     /* In the XENMAPSPACE_gmfn case we still hold a ref on the old page. */
-    put_gfn(d, gpfn);
+    put_gfn(d, gfn_x(gpfn));
 
     /* Unmap from old location, if any. */
     old_gpfn = get_gpfn_from_mfn(mfn);
@@ -4872,7 +4871,7 @@ int xenmem_add_to_physmap_one(
         guest_physmap_remove_page(d, _gfn(old_gpfn), _mfn(mfn), PAGE_ORDER_4K);
 
     /* Map at new location. */
-    rc = guest_physmap_add_page(d, _gfn(gpfn), _mfn(mfn), PAGE_ORDER_4K);
+    rc = guest_physmap_add_page(d, gpfn, _mfn(mfn), PAGE_ORDER_4K);
 
     /* In the XENMAPSPACE_gmfn, we took a ref of the gfn at the top */
     if ( space == XENMAPSPACE_gmfn || space == XENMAPSPACE_gmfn_range )
diff --git a/xen/common/memory.c b/xen/common/memory.c
index a8a75e0..812334b 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -649,7 +649,7 @@ static int xenmem_add_to_physmap(struct domain *d,
 
     if ( xatp->space != XENMAPSPACE_gmfn_range )
         return xenmem_add_to_physmap_one(d, xatp->space, extra,
-                                         xatp->idx, xatp->gpfn);
+                                         xatp->idx, _gfn(xatp->gpfn));
 
     if ( xatp->size < start )
         return -EILSEQ;
@@ -666,7 +666,7 @@ static int xenmem_add_to_physmap(struct domain *d,
     while ( xatp->size > done )
     {
         rc = xenmem_add_to_physmap_one(d, xatp->space, extra,
-                                       xatp->idx, xatp->gpfn);
+                                       xatp->idx, _gfn(xatp->gpfn));
         if ( rc < 0 )
             break;
 
@@ -735,7 +735,7 @@ static int xenmem_add_to_physmap_batch(struct domain *d,
 
         rc = xenmem_add_to_physmap_one(d, xatpb->space,
                                        xatpb->u,
-                                       idx, gpfn);
+                                       idx, _gfn(gpfn));
 
         if ( unlikely(__copy_to_guest_offset(xatpb->errs, 0, &rc, 1)) )
         {
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index b62f473..afbb1a1 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -548,7 +548,7 @@ void scrub_one_page(struct page_info *);
 
 int xenmem_add_to_physmap_one(struct domain *d, unsigned int space,
                               union xen_add_to_physmap_batch_extra extra,
-                              unsigned long idx, xen_pfn_t gpfn);
+                              unsigned long idx, gfn_t gfn);
 
 /* Returns 1 on success, 0 on error, negative if the ring
  * for event propagation is full in the presence of paging */
-- 
1.9.1


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