[Xen-devel] [PATCH v3 03/14] xen/grant-table: Make arch specific macros typesafe

[Julien Grall <julien.grall@xxxxxxx>]

This patch rework all the arch specific macros in grant_table.h to use
the typesafe MFN/GFN.

At the same time, some functions are renamed s/gmfn/gfn/ to match the
current naming scheme (see include/mm.h).

No functional changes intended.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>

---
    Changes in v3:
        - Add Stefano's reviewed-by

    Changes in v2:
        - Update commit message to explain the changes made
        - Fix indentation
        - Adapt the code to match the new prototype of mfn_to_gfn
        - Add Jan's acked-by for non-ARM parts
---
 xen/common/grant_table.c          |  4 ++--
 xen/include/asm-arm/grant_table.h | 12 ++++++------
 xen/include/asm-x86/grant_table.h | 19 +++++++------------
 3 files changed, 15 insertions(+), 20 deletions(-)

diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index dd8a9d9046..7680241851 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -1960,7 +1960,7 @@ gnttab_setup_table(
     op.status = GNTST_okay;
     for ( i = 0; i < op.nr_frames; i++ )
     {
-        xen_pfn_t gmfn = gnttab_shared_gmfn(d, gt, i);
+        xen_pfn_t gmfn = gfn_x(gnttab_shared_gfn(d, gt, i));
 
         /* Grant tables cannot be shared */
         BUG_ON(SHARED_M2P(gmfn));
@@ -3174,7 +3174,7 @@ 
gnttab_get_status_frames(XEN_GUEST_HANDLE_PARAM(gnttab_get_status_frames_t) uop,
 
     for ( i = 0; i < op.nr_frames; i++ )
     {
-        gmfn = gnttab_status_gmfn(d, gt, i);
+        gmfn = gfn_x(gnttab_status_gfn(d, gt, i));
         if ( copy_to_guest_offset(op.frame_list, i, &gmfn, 1) )
             op.status = GNTST_bad_virt_addr;
     }
diff --git a/xen/include/asm-arm/grant_table.h 
b/xen/include/asm-arm/grant_table.h
index 051db1362b..750536184e 100644
--- a/xen/include/asm-arm/grant_table.h
+++ b/xen/include/asm-arm/grant_table.h
@@ -65,15 +65,15 @@ void gnttab_mark_dirty(struct domain *d, mfn_t mfn);
     } while ( 0 )
 
 #define gnttab_get_frame_gfn(gt, st, idx) ({                             \
-   _gfn((st) ? gnttab_status_gmfn(NULL, gt, idx)                         \
-             : gnttab_shared_gmfn(NULL, gt, idx));                       \
+   (st) ? gnttab_status_gfn(NULL, gt, idx)                               \
+        : gnttab_shared_gfn(NULL, gt, idx);                              \
 })
 
-#define gnttab_shared_gmfn(d, t, i)                                      \
-    gfn_x(((i) >= nr_grant_frames(t)) ? INVALID_GFN : (t)->arch.shared_gfn[i])
+#define gnttab_shared_gfn(d, t, i)                                       \
+    (((i) >= nr_grant_frames(t)) ? INVALID_GFN : (t)->arch.shared_gfn[i])
 
-#define gnttab_status_gmfn(d, t, i)                                      \
-    gfn_x(((i) >= nr_status_frames(t)) ? INVALID_GFN : (t)->arch.status_gfn[i])
+#define gnttab_status_gfn(d, t, i)                                       \
+    (((i) >= nr_status_frames(t)) ? INVALID_GFN : (t)->arch.status_gfn[i])
 
 #define gnttab_need_iommu_mapping(d)                    \
     (is_domain_direct_mapped(d) && need_iommu_pt_sync(d))
diff --git a/xen/include/asm-x86/grant_table.h 
b/xen/include/asm-x86/grant_table.h
index 8b604ed51f..661228dd39 100644
--- a/xen/include/asm-x86/grant_table.h
+++ b/xen/include/asm-x86/grant_table.h
@@ -39,24 +39,19 @@ static inline int replace_grant_host_mapping(uint64_t addr, 
mfn_t frame,
 #define gnttab_destroy_arch(gt) do {} while ( 0 )
 #define gnttab_set_frame_gfn(gt, st, idx, gfn) do {} while ( 0 )
 #define gnttab_get_frame_gfn(gt, st, idx) ({                             \
-    unsigned long mfn_ = (st) ? gnttab_status_mfn(gt, idx)               \
-                              : gnttab_shared_mfn(gt, idx);              \
-    unsigned long gpfn_ = get_gpfn_from_mfn(mfn_);                       \
+    mfn_t mfn_ = (st) ? gnttab_status_mfn(gt, idx)                       \
+                      : gnttab_shared_mfn(gt, idx);                      \
+    unsigned long gpfn_ = get_gpfn_from_mfn(mfn_x(mfn_));                \
     VALID_M2P(gpfn_) ? _gfn(gpfn_) : INVALID_GFN;                        \
 })
 
-#define gnttab_shared_mfn(t, i)                         \
-    ((virt_to_maddr((t)->shared_raw[i]) >> PAGE_SHIFT))
+#define gnttab_shared_mfn(t, i) _mfn(__virt_to_mfn((t)->shared_raw[i]))
 
-#define gnttab_shared_gmfn(d, t, i)                     \
-    (mfn_to_gmfn(d, gnttab_shared_mfn(t, i)))
+#define gnttab_shared_gfn(d, t, i) mfn_to_gfn(d, gnttab_shared_mfn(t, i))
 
+#define gnttab_status_mfn(t, i) _mfn(__virt_to_mfn((t)->status[i]))
 
-#define gnttab_status_mfn(t, i)                         \
-    ((virt_to_maddr((t)->status[i]) >> PAGE_SHIFT))
-
-#define gnttab_status_gmfn(d, t, i)                     \
-    (mfn_to_gmfn(d, gnttab_status_mfn(t, i)))
+#define gnttab_status_gfn(d, t, i) mfn_to_gfn(d, gnttab_status_mfn(t, i))
 
 #define gnttab_mark_dirty(d, f) paging_mark_dirty(d, f)
 
-- 
2.11.0


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