xen: reserve Xen-specific memory in e820 map

[karo-tx-linux.git] / arch / x86 / xen / setup.c

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 9001c9df04d82a7027408633244c868b25ea2944..dc2ca8ad3603aba73b8a4ed8c78478c74e31ba4a 100644 (file)
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -16,6 +16,7 @@
 #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 +28,6 @@
 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.
@@ -38,10 +37,25 @@ 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;
+
        e820_add_region(0, LOWMEMSIZE(), E820_RAM);
        e820_add_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
 
+       /*
+        * 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";
 }