1 files changed, 26 insertions, 4 deletions

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 82517e4a752a..e0a39595bde3 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -13,9 +13,11 @@
 #include <asm/vdso.h>
 #include <asm/e820.h>
 #include <asm/setup.h>
+#include <asm/acpi.h>
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
 
+#include <xen/page.h>
 #include <xen/interface/callback.h>
 #include <xen/interface/physdev.h>
 #include <xen/features.h>
@@ -27,8 +29,6 @@
 extern const char xen_hypervisor_callback[];
 extern const char xen_failsafe_callback[];
 
-unsigned long *phys_to_machine_mapping;
-EXPORT_SYMBOL(phys_to_machine_mapping);
 
 /**
  * machine_specific_memory_setup - Hook for machine specific memory setup.
@@ -38,9 +38,31 @@ char * __init xen_memory_setup(void)
 {
         unsigned long max_pfn = xen_start_info->nr_pages;
 
+        max_pfn = min(MAX_DOMAIN_PAGES, max_pfn);
+
         e820.nr_map = 0;
-        add_memory_region(0, LOWMEMSIZE(), E820_RAM);
-        add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
+
+        e820_add_region(0, PFN_PHYS(max_pfn), E820_RAM);
+
+        /*
+         * Even though this is normal, usable memory under Xen, reserve
+         * ISA memory anyway because too many things think they can poke
+         * about in there.
+         */
+        e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
+                        E820_RESERVED);
+
+        /*
+         * Reserve Xen bits:
+         *  - mfn_list
+         *  - xen_start_info
+         * See comment above "struct start_info" in <xen/interface/xen.h>
+         */
+        e820_add_region(__pa(xen_start_info->mfn_list),
+                        xen_start_info->pt_base - xen_start_info->mfn_list,
+                        E820_RESERVED);
+
+        sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
 
         return "Xen";
 }