[Xen-devel] [PATCH v3 13/18] xen: init memory regions for PVH

[Juergen Gross <jgross@xxxxxxxx>]

Add all usable memory regions to grub memory management and add the
needed mmap iterate code, which will be used by grub core (e.g.
grub-core/lib/relocator.c or grub-core/mmap/mmap.c).

As we are running in 32-bit mode don't add memory above 4GB.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 grub-core/kern/i386/xen/pvh.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/grub-core/kern/i386/xen/pvh.c b/grub-core/kern/i386/xen/pvh.c
index 487a87214..69efe550c 100644
--- a/grub-core/kern/i386/xen/pvh.c
+++ b/grub-core/kern/i386/xen/pvh.c
@@ -217,6 +217,30 @@ grub_xen_get_mmap (void)
   grub_xen_sort_mmap ();
 }
 
+static void
+grub_xen_mm_init_regions (void)
+{
+  grub_uint64_t modend, from, to;
+  unsigned int i;
+
+  modend = grub_modules_get_end ();
+
+  for (i = 0; i < nr_map_entries; i++)
+    {
+      if (map[i].type != GRUB_MEMORY_AVAILABLE)
+        continue;
+      from = map[i].addr;
+      to = from + map[i].len;
+      if (from < modend)
+        from = modend;
+      if (from >= to || from >= 0x100000000ULL)
+        continue;
+      if (to > 0x100000000ULL)
+        to = 0x100000000ULL;
+      grub_mm_init_region ((void *) (grub_addr_t) from, to - from);
+    }
+}
+
 static grub_uint64_t
 grub_xen_find_page (grub_uint64_t start)
 {
@@ -296,10 +320,21 @@ grub_xen_setup_pvh (void)
   grub_xen_shared_info = grub_xen_add_physmap (XENMAPSPACE_shared_info,
                                               (void *) par);
 
+  grub_xen_mm_init_regions ();
+
   grub_rsdp_addr = pvh_start_info->rsdp_paddr;
 }
 
 grub_err_t
 grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
 {
+  unsigned int i;
+
+  for (i = 0; i < nr_map_entries; i++)
+    {
+      if (map[i].len && hook (map[i].addr, map[i].len, map[i].type, hook_data))
+        break;
+    }
+
+  return GRUB_ERR_NONE;
 }
-- 
2.16.4


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