[PATCH 10/14] xen: Remove mfn_to_gmfn macro

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

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@arm.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>

---
    Changes in v2:
        - Add Jan's and Stefano's acked-by
---
 xen/drivers/passthrough/iommu.c | 7 +++----
 xen/include/asm-arm/mm.h        | 4 +---
 xen/include/asm-x86/mm.h        | 5 -----
 3 files changed, 4 insertions(+), 12 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index dbb64b13bc..054f71b919 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -195,8 +195,8 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
 
         page_list_for_each ( page, &d->page_list )
         {
-            unsigned long mfn = mfn_x(page_to_mfn(page));
-            unsigned long dfn = mfn_to_gmfn(d, mfn);
+            mfn_t mfn = page_to_mfn(page);
+            dfn_t dfn = _dfn(gfn_x(mfn_to_gfn(d, mfn)));
             unsigned int mapping = IOMMUF_readable;
             int ret;
 
@@ -205,8 +205,7 @@ void __hwdom_init iommu_hwdom_init(struct domain *d)
                   == PGT_writable_page) )
                 mapping |= IOMMUF_writable;
 
-            ret = iommu_map(d, _dfn(dfn), _mfn(mfn), 0, mapping,
-                            &flush_flags);
+            ret = iommu_map(d, dfn, mfn, 0, mapping, &flush_flags);
 
             if ( !rc )
                 rc = ret;
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index a9c8352b94..a9cb98a6c7 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -321,10 +321,8 @@ 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 6f76f004ab..717378730b 100644
--- a/xen/include/asm-x86/mm.h
+++ b/xen/include/asm-x86/mm.h
@@ -506,11 +506,6 @@ 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))
 
-- 
2.11.0


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