[PATCH v2 (resend) 22/27] Rename mfn_to_virt() calls

[Elias El Yandouzi <eliasely@amazon.com>]

Until directmap gets completely removed, we'd still need to
keep some calls to mfn_to_virt() for xenheap pages or when the
directmap is enabled.

Rename the macro to mfn_to_directmap_virt() to flag them and
prevent further use of mfn_to_virt().

Signed-off-by: Elias El Yandouzi <eliasely@amazon.com>

diff --git a/xen/arch/arm/include/asm/mm.h b/xen/arch/arm/include/asm/mm.h
index cbcf3bf147..9a94d7eaf7 100644
--- a/xen/arch/arm/include/asm/mm.h
+++ b/xen/arch/arm/include/asm/mm.h
@@ -336,6 +336,7 @@ static inline uint64_t gvirt_to_maddr(vaddr_t va, paddr_t *pa,
  */
 #define virt_to_mfn(va)     __virt_to_mfn(va)
 #define mfn_to_virt(mfn)    __mfn_to_virt(mfn)
+#define mfn_to_directmap_virt(mfn) mfn_to_virt(mfn)
 
 /* Convert between Xen-heap virtual addresses and page-info structures. */
 static inline struct page_info *virt_to_page(const void *v)
diff --git a/xen/arch/x86/domain_page.c b/xen/arch/x86/domain_page.c
index 89caefc8a2..62d6fee0f4 100644
--- a/xen/arch/x86/domain_page.c
+++ b/xen/arch/x86/domain_page.c
@@ -81,14 +81,14 @@ void *map_domain_page(mfn_t mfn)
 
 #ifdef NDEBUG
     if ( arch_mfns_in_directmap(mfn_x(mfn), 1) )
-        return mfn_to_virt(mfn_x(mfn));
+        return mfn_to_directmap_virt(mfn_x(mfn));
 #endif
 
     v = mapcache_current_vcpu();
     if ( !v || !v->domain->arch.mapcache.inuse )
     {
         if ( arch_mfns_in_directmap(mfn_x(mfn), 1) )
-            return mfn_to_virt(mfn_x(mfn));
+            return mfn_to_directmap_virt(mfn_x(mfn));
         else
         {
             BUG_ON(system_state >= SYS_STATE_smp_boot);
@@ -324,7 +324,7 @@ void *map_domain_page_global(mfn_t mfn)
 
 #ifdef NDEBUG
     if ( arch_mfn_in_directmap(mfn_x(mfn, 1)) )
-        return mfn_to_virt(mfn_x(mfn));
+        return mfn_to_directmap_virt(mfn_x(mfn));
 #endif
 
     return vmap(&mfn, 1);
diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c
index e59f6657d9..1b3ebae16f 100644
--- a/xen/arch/x86/hvm/dom0_build.c
+++ b/xen/arch/x86/hvm/dom0_build.c
@@ -439,7 +439,7 @@ static int __init pvh_populate_p2m(struct domain *d)
                                  d->arch.e820[i].addr + d->arch.e820[i].size);
             enum hvm_translation_result res =
                  hvm_copy_to_guest_phys(mfn_to_maddr(_mfn(addr)),
-                                        mfn_to_virt(addr),
+                                        mfn_to_directmap_virt(addr),
                                         end - d->arch.e820[i].addr,
                                         v);
 
@@ -613,7 +613,7 @@ static int __init pvh_load_kernel(struct domain *d, const module_t *image,
 
     if ( initrd != NULL )
     {
-        rc = hvm_copy_to_guest_phys(last_addr, mfn_to_virt(initrd->mod_start),
+        rc = hvm_copy_to_guest_phys(last_addr, mfn_to_directmap_virt(initrd->mod_start),
                                     initrd->mod_end, v);
         if ( rc )
         {
diff --git a/xen/arch/x86/include/asm/page.h b/xen/arch/x86/include/asm/page.h
index 350d1fb110..c6891b52d4 100644
--- a/xen/arch/x86/include/asm/page.h
+++ b/xen/arch/x86/include/asm/page.h
@@ -268,7 +268,7 @@ void copy_page_sse2(void *to, const void *from);
  */
 #define mfn_valid(mfn)      __mfn_valid(mfn_x(mfn))
 #define virt_to_mfn(va)     __virt_to_mfn(va)
-#define mfn_to_virt(mfn)    __mfn_to_virt(mfn)
+#define mfn_to_directmap_virt(mfn)    __mfn_to_virt(mfn)
 #define virt_to_maddr(va)   __virt_to_maddr((unsigned long)(va))
 #define maddr_to_virt(ma)   __maddr_to_virt((unsigned long)(ma))
 #define maddr_to_page(ma)   __maddr_to_page(ma)
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index a72c32d87c..9530c93b68 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -318,8 +318,8 @@ void __init arch_init_memory(void)
         iostart_pfn = max_t(unsigned long, pfn, 1UL << (20 - PAGE_SHIFT));
         ioend_pfn = min(rstart_pfn, 16UL << (20 - PAGE_SHIFT));
         if ( iostart_pfn < ioend_pfn )
-            destroy_xen_mappings((unsigned long)mfn_to_virt(iostart_pfn),
-                                 (unsigned long)mfn_to_virt(ioend_pfn));
+            destroy_xen_mappings((unsigned long)mfn_to_directmap_virt(iostart_pfn),
+                                 (unsigned long)mfn_to_directmap_virt(ioend_pfn));
 
         /* Mark as I/O up to next RAM region. */
         for ( ; pfn < rstart_pfn; pfn++ )
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 84c496ac4a..de69b7935c 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -400,7 +400,7 @@ void *__init bootstrap_map(const module_t *mod)
     void *ret;
 
     if ( system_state != SYS_STATE_early_boot )
-        return mod ? mfn_to_virt(mod->mod_start) : NULL;
+        return mod ? mfn_to_directmap_virt(mod->mod_start) : NULL;
 
     if ( !mod )
     {
@@ -1703,7 +1703,7 @@ void asmlinkage __init noreturn __start_xen(unsigned long mbi_p)
     {
         set_pdx_range(mod[i].mod_start,
                       mod[i].mod_start + PFN_UP(mod[i].mod_end));
-        map_pages_to_xen((unsigned long)mfn_to_virt(mod[i].mod_start),
+        map_pages_to_xen((unsigned long)mfn_to_directmap_virt(mod[i].mod_start),
                          _mfn(mod[i].mod_start),
                          PFN_UP(mod[i].mod_end), PAGE_HYPERVISOR);
     }
diff --git a/xen/arch/x86/tboot.c b/xen/arch/x86/tboot.c
index 86c4c22cac..4368a64009 100644
--- a/xen/arch/x86/tboot.c
+++ b/xen/arch/x86/tboot.c
@@ -253,7 +253,7 @@ static void tboot_gen_xenheap_integrity(const uint8_t key[TB_KEY_SIZE],
             continue; /* skip tboot and its page tables */
 
         if ( is_page_in_use(page) && is_special_page(page) )
-            vmac_update(mfn_to_virt(mfn), PAGE_SIZE, &ctx);
+            vmac_update(mfn_to_directmap_virt(mfn), PAGE_SIZE, &ctx);
     }
     *mac = vmac(NULL, 0, nonce, NULL, &ctx);
 
diff --git a/xen/arch/x86/x86_64/mm.c b/xen/arch/x86/x86_64/mm.c
index b2a280fba3..1697760d82 100644
--- a/xen/arch/x86/x86_64/mm.c
+++ b/xen/arch/x86/x86_64/mm.c
@@ -1247,19 +1247,25 @@ int memory_add(unsigned long spfn, unsigned long epfn, unsigned int pxm)
     i = virt_to_mfn(HYPERVISOR_VIRT_END - 1) + 1;
     if ( spfn < i )
     {
-        ret = map_pages_to_xen((unsigned long)mfn_to_virt(spfn), _mfn(spfn),
-                               min(epfn, i) - spfn, PAGE_HYPERVISOR);
-        if ( ret )
-            goto destroy_directmap;
+        if ( arch_mfns_in_directmap(spfn, min(epfn, i) - spfn ) )
+        {
+            ret = map_pages_to_xen((unsigned long)mfn_to_directmap_virt(spfn), _mfn(spfn),
+                                min(epfn, i) - spfn, PAGE_HYPERVISOR);
+            if ( ret )
+                goto destroy_directmap;
+        }
     }
     if ( i < epfn )
     {
         if ( i < spfn )
             i = spfn;
-        ret = map_pages_to_xen((unsigned long)mfn_to_virt(i), _mfn(i),
-                               epfn - i, __PAGE_HYPERVISOR_RW);
-        if ( ret )
-            goto destroy_directmap;
+        if ( arch_mfns_in_directmap(spfn, epfn - i) )
+        {
+            ret = map_pages_to_xen((unsigned long)mfn_to_directmap_virt(i), _mfn(i),
+                                epfn - i, __PAGE_HYPERVISOR_RW);
+            if ( ret )
+                goto destroy_directmap;
+        }
     }
 
     old_node_start = node_start_pfn(node);
@@ -1348,8 +1354,8 @@ destroy_frametable:
     NODE_DATA(node)->node_start_pfn = old_node_start;
     NODE_DATA(node)->node_spanned_pages = old_node_span;
  destroy_directmap:
-    destroy_xen_mappings((unsigned long)mfn_to_virt(spfn),
-                         (unsigned long)mfn_to_virt(epfn));
+    destroy_xen_mappings((unsigned long)mfn_to_directmap_virt(spfn),
+                         (unsigned long)mfn_to_directmap_virt(epfn));
 
     return ret;
 }
diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
index efbec00af9..39aed5845d 100644
--- a/xen/common/efi/boot.c
+++ b/xen/common/efi/boot.c
@@ -1599,7 +1599,7 @@ static __init void copy_mapping(unsigned long mfn, unsigned long end,
     for ( ; mfn < end; mfn = next )
     {
         l4_pgentry_t l4e = efi_l4t[l4_table_offset(mfn << PAGE_SHIFT)];
-        unsigned long va = (unsigned long)mfn_to_virt(mfn);
+        unsigned long va = (unsigned long)mfn_to_directmap_virt(mfn);
 
         if ( !(mfn & ((1UL << (L4_PAGETABLE_SHIFT - PAGE_SHIFT)) - 1)) )
             UNMAP_DOMAIN_PAGE(l3dst);
@@ -1757,15 +1757,18 @@ void __init efi_init_memory(void)
         if ( pfn_to_pdx(emfn - 1) < (DIRECTMAP_SIZE >> PAGE_SHIFT) &&
              pdx_is_region_compressible(mem_base, mem_npages) )
         {
-            if ( (unsigned long)mfn_to_virt(emfn - 1) >= HYPERVISOR_VIRT_END )
-                prot &= ~_PAGE_GLOBAL;
-            if ( map_pages_to_xen((unsigned long)mfn_to_virt(smfn),
-                                  _mfn(smfn), emfn - smfn, prot) == 0 )
-                desc->VirtualStart =
-                    (unsigned long)maddr_to_virt(desc->PhysicalStart);
-            else
-                printk(XENLOG_ERR "Could not map MFNs %#lx-%#lx\n",
-                       smfn, emfn - 1);
+            if ( arch_mfns_in_directmap(smfn, emfn - smfn) )
+            {
+                if ( (unsigned long)mfn_to_directmap_virt(emfn - 1) >= HYPERVISOR_VIRT_END )
+                    prot &= ~_PAGE_GLOBAL;
+                if ( map_pages_to_xen((unsigned long)mfn_to_directmap_virt(smfn),
+                                    _mfn(smfn), emfn - smfn, prot) == 0 )
+                    desc->VirtualStart =
+                        (unsigned long)maddr_to_virt(desc->PhysicalStart);
+                else
+                    printk(XENLOG_ERR "Could not map MFNs %#lx-%#lx\n",
+                        smfn, emfn - 1);
+            }
         }
         else if ( !((desc->PhysicalStart + len - 1) >> (VADDR_BITS - 1)) &&
                   (extra = xmalloc(struct rt_extra)) != NULL )
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 42b9aaae1c..0877e275e5 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -610,8 +610,8 @@ static unsigned long init_node_heap(int node, unsigned long mfn,
     {
         if ( arch_mfns_in_directmap(mfn + nr - needed, needed) )
         {
-            _heap[node] = mfn_to_virt(mfn + nr - needed);
-            avail[node] = mfn_to_virt(mfn + nr - 1) +
+            _heap[node] = mfn_to_directmap_virt(mfn + nr - needed);
+            avail[node] = mfn_to_directmap_virt(mfn + nr - 1) +
                           PAGE_SIZE - sizeof(**avail) * NR_ZONES;
         }
         else
@@ -630,8 +630,8 @@ static unsigned long init_node_heap(int node, unsigned long mfn,
     {
         if ( arch_mfns_in_directmap(mfn, needed) )
         {
-            _heap[node] = mfn_to_virt(mfn);
-            avail[node] = mfn_to_virt(mfn + needed - 1) +
+            _heap[node] = mfn_to_directmap_virt(mfn);
+            avail[node] = mfn_to_directmap_virt(mfn + needed - 1) +
                           PAGE_SIZE - sizeof(**avail) * NR_ZONES;
         }
         else
diff --git a/xen/common/trace.c b/xen/common/trace.c
index 4e7b080e61..955509a0d8 100644
--- a/xen/common/trace.c
+++ b/xen/common/trace.c
@@ -229,7 +229,7 @@ static int alloc_trace_bufs(unsigned int pages)
         offset = t_info->mfn_offset[cpu];
 
         /* Initialize the buffer metadata */
-        per_cpu(t_bufs, cpu) = buf = mfn_to_virt(t_info_mfn_list[offset]);
+        per_cpu(t_bufs, cpu) = buf = mfn_to_directmap_virt(t_info_mfn_list[offset]);
         buf->cons = buf->prod = 0;
 
         printk(XENLOG_INFO "xentrace: p%d mfn %x offset %u\n",
@@ -268,7 +268,7 @@ out_dealloc:
             if ( !mfn )
                 break;
             ASSERT(!(mfn_to_page(_mfn(mfn))->count_info & PGC_allocated));
-            free_xenheap_pages(mfn_to_virt(mfn), 0);
+            free_xenheap_pages(mfn_to_directmap_virt(mfn), 0);
         }
     }
     free_xenheap_pages(t_info, get_order_from_pages(t_info_pages));
@@ -529,7 +529,7 @@ static unsigned char *next_record(const struct t_buf *buf, uint32_t *next,
     per_cpu_mfn_offset = t_info->mfn_offset[smp_processor_id()];
     mfn_list = (uint32_t *)t_info;
     mfn = mfn_list[per_cpu_mfn_offset + per_cpu_mfn_nr];
-    this_page = mfn_to_virt(mfn);
+    this_page = (unsigned char *)mfn_to_directmap_virt(mfn);
     if (per_cpu_mfn_nr + 1 >= opt_tbuf_size)
     {
         /* reached end of buffer? */
@@ -538,7 +538,7 @@ static unsigned char *next_record(const struct t_buf *buf, uint32_t *next,
     else
     {
         mfn = mfn_list[per_cpu_mfn_offset + per_cpu_mfn_nr + 1];
-        *next_page = mfn_to_virt(mfn);
+        *next_page = mfn_to_directmap_virt(mfn);
     }
     return this_page;
 }
-- 
2.40.1