[PATCH v4 3/4] xen: Remove mfn_to_gmfn macro

[Julien Grall <julien@xxxxxxx>]

From: Julien Grall <julien.grall@xxxxxxx>

On x86, mfn_to_gmfn can be replaced with mfn_to_gfn. On Arm, there are
no more call to mfn_to_gmfn, so the helper can be dropped.

At the same time rework a comment in Arm code that does not make sense.

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

---
    Changes in v4:
        - Remove acks as the patch is old

    Changes in v2:
        - Add Jan's and Stefano's acked-by
---
 xen/include/asm-arm/mm.h | 4 +---
 xen/include/asm-x86/mm.h | 5 -----
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index f8ba49b1188f..29489a3e1076 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -326,10 +326,8 @@ struct page_info *get_page_from_gva(struct vcpu *v, 
vaddr_t va,
 #define SHARED_M2P_ENTRY         (~0UL - 1UL)
 #define SHARED_M2P(_e)           ((_e) == SHARED_M2P_ENTRY)
 
-/* Xen always owns P2M on ARM */
+/* We don't have a M2P on Arm */
 #define set_gpfn_from_mfn(mfn, pfn) do { (void) (mfn), (void)(pfn); } while (0)
-#define mfn_to_gmfn(_d, mfn)  (mfn)
-
 
 /* Arch-specific portion of memory_op hypercall. */
 long arch_memory_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg);
diff --git a/xen/include/asm-x86/mm.h b/xen/include/asm-x86/mm.h
index deeba75a1cbb..dfa71ce15ac3 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -508,11 +508,6 @@ extern struct rangeset *mmio_ro_ranges;
 
 #define get_gpfn_from_mfn(mfn)      (machine_to_phys_mapping[(mfn)])
 
-#define mfn_to_gmfn(_d, mfn)                            \
-    ( (paging_mode_translate(_d))                       \
-      ? get_gpfn_from_mfn(mfn)                          \
-      : (mfn) )
-
 #define compat_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 
20))
 #define compat_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 
20))
 
-- 
2.17.1