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[Xen-devel] [PATCH v2 10/10] xen: arm: Use a direct mapping of RAM on arm64



We have plenty of virtual address space so we can avoid needing to map and
unmap pages all the time.

A totally arbitrarily chosen 32GB frame table leads to support for 5TB of RAM.
I haven't tested with anything near that amount of RAM though. There is plenty
of room to expand further when that becomes necessary.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
v2: Remove obsolete comments hung over from the 32-bit version
    Reformat TODO item about pte.pt.contig
    Duplicate prototype for alternate functions completely inside appropriate
    ifdef instead of just ifdeffing the body.
---
 xen/arch/arm/mm.c            |  157 ++++++++++++++++++++++++++++++++++--------
 xen/arch/arm/setup.c         |   77 ++++++++++++++++++++
 xen/include/asm-arm/config.h |   96 +++++++++++++++++++-------
 xen/include/asm-arm/mm.h     |   16 ++++
 4 files changed, 293 insertions(+), 53 deletions(-)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 974d6df..69c157a 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -37,6 +37,7 @@
 #include <public/memory.h>
 #include <xen/sched.h>
 #include <xen/vmap.h>
+#include <asm/early_printk.h>
 #include <xsm/xsm.h>
 #include <xen/pfn.h>
 
@@ -48,6 +49,14 @@ struct domain *dom_xen, *dom_io, *dom_cow;
 lpae_t boot_pgtable[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 #ifdef CONFIG_ARM_64
 lpae_t boot_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* The first page of the first level mapping of the xenheap. The
+ * subsequent xenheap first level pages are dynamically allocated, but
+ * we need this one to bootstrap ourselves. */
+lpae_t xenheap_first_first[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* The zeroeth level slot which uses xenheap_first_first. Used because
+ * setup_xenheap_mappings otherwise relies on mfn_to_virt which isn't
+ * valid for a non-xenheap mapping. */
+static __initdata int xenheap_first_first_slot = -1;
 #endif
 
 /*
@@ -57,6 +66,9 @@ lpae_t boot_first[LPAE_ENTRIES] 
__attribute__((__aligned__(4096)));
  * xen_second, xen_fixmap and xen_xenmap are shared between all PCPUs.
  */
 
+#ifdef CONFIG_ARM_64
+#define THIS_CPU_PGTABLE boot_pgtable
+#else
 /* Per-CPU pagetable pages */
 /* xen_pgtable == root of the trie (zeroeth level on 64-bit, first on 32-bit) 
*/
 static DEFINE_PER_CPU(lpae_t *, xen_pgtable);
@@ -65,6 +77,7 @@ static DEFINE_PER_CPU(lpae_t *, xen_pgtable);
  * the second level pagetables which mapp the domheap region
  * DOMHEAP_VIRT_START...DOMHEAP_VIRT_END in 2MB chunks. */
 static DEFINE_PER_CPU(lpae_t *, xen_dommap);
+#endif
 
 /* Common pagetable leaves */
 /* Second level page tables.
@@ -73,10 +86,16 @@ static DEFINE_PER_CPU(lpae_t *, xen_dommap);
  * addresses from 0 to 0x7fffffff. Offsets into it are calculated
  * with second_linear_offset(), not second_table_offset().
  *
- * Addresses 0x80000000 to 0xffffffff are covered by the per-cpu
- * xen_domheap mappings described above. However we allocate 4 pages
+ * On 32bit addresses 0x80000000 to 0xffffffff are covered by the
+ * per-cpu xen_domheap mappings described above. We allocate 4 pages
  * here for use in the boot page tables and the second two pages
  * become the boot CPUs xen_dommap pages.
+ *
+ * On 64bit addresses 0x80000000 to 0xffffffff are unused. However we
+ * allocate 4 pages here for use while relocating Xen, which currently
+ * expects a second level page to exist for all addresses in the first
+ * 4GB. We need to keep these extra mappings in place for seconary CPU
+ * bring up too. For now we just leave them forever.
  */
 lpae_t xen_second[LPAE_ENTRIES*4] __attribute__((__aligned__(4096*4)));
 /* First level page table used for fixmap */
@@ -92,7 +111,7 @@ uint64_t boot_ttbr;
 static paddr_t phys_offset;
 
 /* Limits of the Xen heap */
-unsigned long xenheap_mfn_start __read_mostly;
+unsigned long xenheap_mfn_start __read_mostly = ~0UL;
 unsigned long xenheap_mfn_end __read_mostly;
 unsigned long xenheap_virt_end __read_mostly;
 
@@ -112,7 +131,9 @@ static inline void 
check_memory_layout_alignment_constraints(void) {
     BUILD_BUG_ON(BOOT_MISC_VIRT_START & ~SECOND_MASK);
     /* 1GB aligned regions */
     BUILD_BUG_ON(XENHEAP_VIRT_START & ~FIRST_MASK);
+#ifdef CONFIG_DOMAIN_PAGE
     BUILD_BUG_ON(DOMHEAP_VIRT_START & ~FIRST_MASK);
+#endif
 }
 
 void dump_pt_walk(lpae_t *first, paddr_t addr)
@@ -180,6 +201,7 @@ void clear_fixmap(unsigned map)
     flush_xen_data_tlb_range_va(FIXMAP_ADDR(map), PAGE_SIZE);
 }
 
+#ifdef CONFIG_DOMAIN_PAGE
 void *map_domain_page_global(unsigned long mfn)
 {
     return vmap(&mfn, 1);
@@ -284,6 +306,7 @@ unsigned long domain_page_map_to_mfn(const void *va)
 
     return map[slot].pt.base + offset;
 }
+#endif
 
 void __init arch_init_memory(void)
 {
@@ -431,6 +454,7 @@ void __init setup_pagetables(unsigned long 
boot_phys_offset, paddr_t xen_paddr)
     /* Flush everything after setting WXN bit. */
     flush_xen_text_tlb();
 
+#ifdef CONFIG_ARM_32
     per_cpu(xen_pgtable, 0) = boot_pgtable;
     per_cpu(xen_dommap, 0) = xen_second +
         second_linear_offset(DOMHEAP_VIRT_START);
@@ -440,43 +464,33 @@ void __init setup_pagetables(unsigned long 
boot_phys_offset, paddr_t xen_paddr)
     memset(this_cpu(xen_dommap), 0, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
     flush_xen_dcache_va_range(this_cpu(xen_dommap),
                               DOMHEAP_SECOND_PAGES*PAGE_SIZE);
+#endif
 }
-
+#ifdef CONFIG_ARM_64
+int init_secondary_pagetables(int cpu)
+{
+    /* All CPUs share a single page table on 64 bit */
+    return 0;
+}
+#else
 int init_secondary_pagetables(int cpu)
 {
-    lpae_t *root, *first, *domheap, pte;
+    lpae_t *first, *domheap, pte;
     int i;
 
-    root = alloc_xenheap_page();
-#ifdef CONFIG_ARM_64
-    first = alloc_xenheap_page();
-#else
-    first = root; /* root == first level on 32-bit 3-level trie */
-#endif
+    first = alloc_xenheap_page(); /* root == first level on 32-bit 3-level 
trie */
     domheap = alloc_xenheap_pages(get_order_from_pages(DOMHEAP_SECOND_PAGES), 
0);
 
-    if ( root == NULL || domheap == NULL || first == NULL )
+    if ( domheap == NULL || first == NULL )
     {
         printk("Not enough free memory for secondary CPU%d pagetables\n", cpu);
         free_xenheap_pages(domheap, 
get_order_from_pages(DOMHEAP_SECOND_PAGES));
-#ifdef CONFIG_ARM_64
         free_xenheap_page(first);
-#endif
-        free_xenheap_page(root);
         return -ENOMEM;
     }
 
     /* Initialise root pagetable from root of boot tables */
-    memcpy(root, boot_pgtable, PAGE_SIZE);
-
-#ifdef CONFIG_ARM_64
-    /* Initialise first pagetable from first level of boot tables, and
-     * hook into the new root. */
-    memcpy(first, boot_first, PAGE_SIZE);
-    pte = mfn_to_xen_entry(virt_to_mfn(first));
-    pte.pt.table = 1;
-    write_pte(root, pte);
-#endif
+    memcpy(first, boot_pgtable, PAGE_SIZE);
 
     /* Ensure the domheap has no stray mappings */
     memset(domheap, 0, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
@@ -490,17 +504,15 @@ int init_secondary_pagetables(int cpu)
         write_pte(&first[first_table_offset(DOMHEAP_VIRT_START+i*FIRST_SIZE)], 
pte);
     }
 
-    flush_xen_dcache_va_range(root, PAGE_SIZE);
-#ifdef CONFIG_ARM_64
     flush_xen_dcache_va_range(first, PAGE_SIZE);
-#endif
     flush_xen_dcache_va_range(domheap, DOMHEAP_SECOND_PAGES*PAGE_SIZE);
 
-    per_cpu(xen_pgtable, cpu) = root;
+    per_cpu(xen_pgtable, cpu) = first;
     per_cpu(xen_dommap, cpu) = domheap;
 
     return 0;
 }
+#endif
 
 /* MMU setup for secondary CPUS (which already have paging enabled) */
 void __cpuinit mmu_init_secondary_cpu(void)
@@ -544,6 +556,7 @@ static void __init create_32mb_mappings(lpae_t *second,
     flush_xen_data_tlb();
 }
 
+#ifdef CONFIG_ARM_32
 /* Set up the xenheap: up to 1GB of contiguous, always-mapped memory. */
 void __init setup_xenheap_mappings(unsigned long base_mfn,
                                    unsigned long nr_mfns)
@@ -555,6 +568,73 @@ void __init setup_xenheap_mappings(unsigned long base_mfn,
     xenheap_mfn_start = base_mfn;
     xenheap_mfn_end = base_mfn + nr_mfns;
 }
+#else /* CONFIG_ARM_64 */
+void __init setup_xenheap_mappings(unsigned long base_mfn,
+                                   unsigned long nr_mfns)
+{
+    lpae_t *first, pte;
+    unsigned long offset, end_mfn;
+    vaddr_t vaddr;
+
+    /* First call sets the xenheap physical offset. */
+    if ( xenheap_mfn_start == ~0UL )
+        xenheap_mfn_start = base_mfn;
+
+    if ( base_mfn < xenheap_mfn_start )
+        early_panic("cannot add xenheap mapping at %lx below heap start %lx\n",
+                    base_mfn, xenheap_mfn_start);
+
+    end_mfn = base_mfn + nr_mfns;
+
+    /* Align to previous 1GB boundary */
+    base_mfn &= ~FIRST_MASK;
+
+    offset = base_mfn - xenheap_mfn_start;
+    vaddr = DIRECTMAP_VIRT_START + offset*PAGE_SIZE;
+
+    while ( base_mfn < end_mfn )
+    {
+        int slot = zeroeth_table_offset(vaddr);
+        lpae_t *p = &boot_pgtable[slot];
+
+        if ( p->pt.valid )
+        {
+            /* mfn_to_virt is not valid on the 1st 1st mfn, since it
+             * is not within the xenheap. */
+            first = slot == xenheap_first_first_slot ?
+                xenheap_first_first : mfn_to_virt(p->pt.base);
+        }
+        else if ( xenheap_first_first_slot == -1)
+        {
+            /* Use xenheap_first_first to bootstrap the mappings */
+            first = xenheap_first_first;
+
+            pte = pte_of_xenaddr((vaddr_t)xenheap_first_first);
+            pte.pt.table = 1;
+            write_pte(p, pte);
+
+            xenheap_first_first_slot = slot;
+        }
+        else
+        {
+            unsigned long first_mfn = alloc_boot_pages(1, 1);
+            pte = mfn_to_xen_entry(first_mfn);
+            pte.pt.table = 1;
+            write_pte(p, pte);
+            first = mfn_to_virt(first_mfn);
+        }
+
+        pte = mfn_to_xen_entry(base_mfn);
+        /* TODO: Set pte.pt.contig when appropriate. */
+        write_pte(&first[first_table_offset(vaddr)], pte);
+
+        base_mfn += FIRST_SIZE>>PAGE_SHIFT;
+        vaddr += FIRST_SIZE;
+    }
+
+    flush_xen_data_tlb();
+}
+#endif
 
 /* Map a frame table to cover physical addresses ps through pe */
 void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
@@ -562,13 +642,32 @@ void __init setup_frametable_mappings(paddr_t ps, paddr_t 
pe)
     unsigned long nr_pages = (pe - ps) >> PAGE_SHIFT;
     unsigned long frametable_size = nr_pages * sizeof(struct page_info);
     unsigned long base_mfn;
+#ifdef CONFIG_ARM_64
+    lpae_t *second, pte;
+    unsigned long nr_second, second_base;
+    int i;
+#endif
 
     frametable_base_mfn = ps >> PAGE_SHIFT;
 
     /* Round up to 32M boundary */
     frametable_size = (frametable_size + 0x1ffffff) & ~0x1ffffff;
     base_mfn = alloc_boot_pages(frametable_size >> PAGE_SHIFT, 32<<(20-12));
+
+#ifdef CONFIG_ARM_64
+    nr_second = frametable_size >> SECOND_SHIFT;
+    second_base = alloc_boot_pages(nr_second, 1);
+    second = mfn_to_virt(second_base);
+    for ( i = 0; i < nr_second; i++ )
+    {
+        pte = mfn_to_xen_entry(second_base + i);
+        pte.pt.table = 1;
+        write_pte(&boot_first[first_table_offset(FRAMETABLE_VIRT_START)+i], 
pte);
+    }
+    create_32mb_mappings(second, 0, base_mfn, frametable_size >> PAGE_SHIFT);
+#else
     create_32mb_mappings(xen_second, FRAMETABLE_VIRT_START, base_mfn, 
frametable_size >> PAGE_SHIFT);
+#endif
 
     memset(&frame_table[0], 0, nr_pages * sizeof(struct page_info));
     memset(&frame_table[nr_pages], -1,
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 1ec5e38..a25e483 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -278,6 +278,7 @@ static paddr_t __init get_xen_paddr(void)
     return paddr;
 }
 
+#ifdef CONFIG_ARM_32
 static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
 {
     paddr_t ram_start;
@@ -402,6 +403,82 @@ static void __init setup_mm(unsigned long dtb_paddr, 
size_t dtb_size)
 
     end_boot_allocator();
 }
+#else /* CONFIG_ARM_64 */
+static void __init setup_mm(unsigned long dtb_paddr, size_t dtb_size)
+{
+    paddr_t ram_start = ~0;
+    paddr_t ram_end = 0;
+    int bank;
+    unsigned long  xenheap_pages = 0;
+    unsigned long dtb_pages;
+
+    total_pages = 0;
+    for ( bank = 0 ; bank < early_info.mem.nr_banks; bank++ )
+    {
+        paddr_t bank_start = early_info.mem.bank[bank].start;
+        paddr_t bank_size  = early_info.mem.bank[bank].size;
+        paddr_t  bank_end = bank_start + bank_size;
+        unsigned long bank_pages = bank_size >> PAGE_SHIFT;
+        paddr_t s, e;
+
+        total_pages += bank_pages;
+
+        if ( bank_start < ram_start )
+            ram_start = bank_start;
+        if ( bank_end > ram_end )
+            ram_end = bank_end;
+
+        xenheap_pages += (bank_size >> PAGE_SHIFT);
+
+        /* XXX we assume that the ram regions are ordered */
+        s = bank_start;
+        while ( s < bank_end )
+        {
+            paddr_t n = bank_end;
+
+            e = next_module(s, &n);
+
+            if ( e == ~(paddr_t)0 )
+            {
+                e = n = bank_end;
+            }
+
+            setup_xenheap_mappings(s>>PAGE_SHIFT, (e-s)>>PAGE_SHIFT);
+
+            xenheap_mfn_end = e;
+
+            init_boot_pages(s, e);
+            s = n;
+        }
+    }
+
+    xenheap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
+    xenheap_mfn_start = ram_start >> PAGE_SHIFT;
+    xenheap_mfn_end = ram_end >> PAGE_SHIFT;
+    xenheap_max_mfn(xenheap_mfn_end);
+
+    /*
+     * Need enough mapped pages for copying the DTB.
+     *
+     * TODO: The DTB (and other payloads) are assumed to be towards
+     * the start of RAM.
+     */
+    dtb_pages = (dtb_size + PAGE_SIZE-1) >> PAGE_SHIFT;
+
+    /*
+     * Copy the DTB.
+     *
+     * TODO: handle other payloads too.
+     */
+    device_tree_flattened = mfn_to_virt(alloc_boot_pages(dtb_pages, 1));
+    copy_from_paddr(device_tree_flattened, dtb_paddr, dtb_size, BUFFERABLE);
+
+    setup_frametable_mappings(ram_start, ram_end);
+    max_page = PFN_DOWN(ram_end);
+
+    end_boot_allocator();
+}
+#endif
 
 size_t __read_mostly cacheline_bytes;
 
diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index fb9e93c..259d4c6 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -35,9 +35,6 @@
 
 #define CONFIG_SMP 1
 
-#define CONFIG_DOMAIN_PAGE 1
-#define CONFIG_SEPARATE_XENHEAP 1
-
 #define CONFIG_VIDEO 1
 
 #define OPT_CONSOLE_STR "dtuart"
@@ -76,38 +73,89 @@
 #include <xen/const.h>
 
 /*
- * Memory layout:
- *  0  -   2M   Unmapped
- *  2M -   4M   Xen text, data, bss
- *  4M -   6M   Fixmap: special-purpose 4K mapping slots
- *  6M  -  8M   Early boot misc (see below)
- *
- * 32M - 128M   Frametable: 24 bytes per page for 16GB of RAM
- * 256M -  1G   VMAP: ioremap and early_ioremap use this virtual address
- *                    space
- *
- *  1G -   2G   Xenheap: always-mapped memory
- *  2G -   4G   Domheap: on-demand-mapped
+ * Common ARM32 and ARM64 layout:
+ *   0  -   2M   Unmapped
+ *   2M -   4M   Xen text, data, bss
+ *   4M -   6M   Fixmap: special-purpose 4K mapping slots
+ *   6M -   8M   Early boot misc (see below)
  *
  * The early boot misc area is used:
  *   - in head.S for the DTB for device_tree_early_init().
  *   - in setup_pagetables() when relocating Xen.
+ *
+ * ARM32 layout:
+ *   0  -   8M   <COMMON>
+ *
+ *  32M - 128M   Frametable: 24 bytes per page for 16GB of RAM
+ * 256M -   1G   VMAP: ioremap and early_ioremap use this virtual address
+ *                    space
+ *
+ *   1G -   2G   Xenheap: always-mapped memory
+ *   2G -   4G   Domheap: on-demand-mapped
+ *
+ * ARM64 layout:
+ * 0x0000000000000000 - 0x0000007fffffffff (512GB, L0 slot [0])
+ *   0  -   8M   <COMMON>
+ *
+ *   1G -   2G   VMAP: ioremap and early_ioremap
+ *
+ *  32G -  64G   Frametable: 24 bytes per page for 5.3TB of RAM
+ *
+ * 0x0000008000000000 - 0x00007fffffffffff (127.5TB, L0 slots [1..255])
+ *  Unused
+ *
+ * 0x0000800000000000 - 0x000084ffffffffff (5TB, L0 slots [256..265])
+ *  1:1 mapping of RAM
+ *
+ * 0x0000850000000000 - 0x0000ffffffffffff (123TB, L0 slots [266..511])
+ *  Unused
  */
 
-#define XEN_VIRT_START         _AC(0x00200000,UL)
-#define FIXMAP_ADDR(n)        (_AC(0x00400000,UL) + (n) * PAGE_SIZE)
-#define BOOT_MISC_VIRT_START   _AC(0x00600000,UL)
-#define FRAMETABLE_VIRT_START  _AC(0x02000000,UL)
-#define VMAP_VIRT_START        _AC(0x10000000,UL)
-#define XENHEAP_VIRT_START     _AC(0x40000000,UL)
-#define DOMHEAP_VIRT_START     _AC(0x80000000,UL)
-#define DOMHEAP_VIRT_END       _AC(0xffffffff,UL)
+#define XEN_VIRT_START         _AT(vaddr_t,0x00200000)
+#define FIXMAP_ADDR(n)        (_AT(vaddr_t,0x00400000) + (n) * PAGE_SIZE)
+#define BOOT_MISC_VIRT_START   _AT(vaddr_t,0x00600000)
 
-#define VMAP_VIRT_END          XENHEAP_VIRT_START
 #define HYPERVISOR_VIRT_START  XEN_VIRT_START
 
+#ifdef CONFIG_ARM_32
+
+#define CONFIG_DOMAIN_PAGE 1
+#define CONFIG_SEPARATE_XENHEAP 1
+
+#define FRAMETABLE_VIRT_START  _AT(vaddr_t,0x02000000)
+#define VMAP_VIRT_START  _AT(vaddr_t,0x10000000)
+#define XENHEAP_VIRT_START     _AT(vaddr_t,0x40000000)
+#define XENHEAP_VIRT_END       _AT(vaddr_t,0x7fffffff)
+#define DOMHEAP_VIRT_START     _AT(vaddr_t,0x80000000)
+#define DOMHEAP_VIRT_END       _AT(vaddr_t,0xffffffff)
+
+#define VMAP_VIRT_END    XENHEAP_VIRT_START
+
 #define DOMHEAP_ENTRIES        1024  /* 1024 2MB mapping slots */
 
+#else /* ARM_64 */
+
+#define SLOT0_ENTRY_BITS  39
+#define SLOT0(slot) (_AT(vaddr_t,slot) << SLOT0_ENTRY_BITS)
+#define SLOT0_ENTRY_SIZE  SLOT0(1)
+#define GB(_gb)     (_AC(_gb, UL) << 30)
+
+#define VMAP_VIRT_START  GB(1)
+#define VMAP_VIRT_END    (VMAP_VIRT_START + GB(1) - 1)
+
+#define FRAMETABLE_VIRT_START  GB(32)
+#define FRAMETABLE_VIRT_END    (FRAMETABLE_VIRT_START + GB(32) - 1)
+
+#define DIRECTMAP_VIRT_START   SLOT0(256)
+#define DIRECTMAP_SIZE         (SLOT0_ENTRY_SIZE * (265-256))
+#define DIRECTMAP_VIRT_END     (DIRECTMAP_VIRT_START + DIRECTMAP_SIZE - 1)
+
+#define XENHEAP_VIRT_START     DIRECTMAP_VIRT_START
+
+#define HYPERVISOR_VIRT_END    DIRECTMAP_VIRT_END
+
+#endif
+
 /* Number of domheap pagetable pages required at the second level (2MB 
mappings) */
 #define DOMHEAP_SECOND_PAGES ((DOMHEAP_VIRT_END - DOMHEAP_VIRT_START + 1) >> 
FIRST_SHIFT)
 
diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
index 7aca836..27284d0 100644
--- a/xen/include/asm-arm/mm.h
+++ b/xen/include/asm-arm/mm.h
@@ -118,11 +118,18 @@ struct page_info
 extern unsigned long xenheap_mfn_start, xenheap_mfn_end;
 extern unsigned long xenheap_virt_end;
 
+#ifdef CONFIG_ARM_32
 #define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
 #define is_xen_heap_mfn(mfn) ({                                 \
     unsigned long _mfn = (mfn);                                 \
     (_mfn >= xenheap_mfn_start && _mfn < xenheap_mfn_end);      \
 })
+#else
+#define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
+#define is_xen_heap_mfn(mfn) \
+    (mfn_valid(mfn) && is_xen_heap_page(__mfn_to_page(mfn)))
+#endif
+
 #define is_xen_fixed_mfn(mfn)                                   \
     ((((mfn) << PAGE_SHIFT) >= virt_to_maddr(&_start)) &&       \
      (((mfn) << PAGE_SHIFT) <= virt_to_maddr(&_end)))
@@ -215,12 +222,21 @@ static inline paddr_t __virt_to_maddr(vaddr_t va)
 }
 #define virt_to_maddr(va)   __virt_to_maddr((vaddr_t)(va))
 
+#ifdef CONFIG_ARM_32
 static inline void *maddr_to_virt(paddr_t ma)
 {
     ASSERT(is_xen_heap_mfn(ma >> PAGE_SHIFT));
     ma -= pfn_to_paddr(xenheap_mfn_start);
     return (void *)(unsigned long) ma + XENHEAP_VIRT_START;
 }
+#else
+static inline void *maddr_to_virt(paddr_t ma)
+{
+    ASSERT((ma >> PAGE_SHIFT) < (DIRECTMAP_SIZE >> PAGE_SHIFT));
+    ma -= pfn_to_paddr(xenheap_mfn_start);
+    return (void *)(unsigned long) ma + DIRECTMAP_VIRT_START;
+}
+#endif
 
 static inline int gvirt_to_maddr(vaddr_t va, paddr_t *pa)
 {
-- 
1.7.2.5


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