Since the Xen heap pages (which are the only ones mapped at this point)
don''t get passed to init_boot_pages(), it has no place to store the
bootmem regions without faulting. Hence, a mapped page must be passed
to that function as the very first thing.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 2009-07-10.orig/xen/arch/x86/setup.c 2009-07-10 13:58:29.000000000 +0200
+++ 2009-07-10/xen/arch/x86/setup.c 2009-07-10 16:11:31.000000000 +0200
@@ -766,7 +766,9 @@ void __init __start_xen(unsigned long mb
reserve_e820_ram(&boot_e820, initial_images_base, initial_images_end);
#if defined(CONFIG_X86_32)
- xenheap_initial_phys_start = __pa(&_end);
+ xenheap_initial_phys_start = (PFN_UP(__pa(&_end)) + 1) <<
PAGE_SHIFT;
+ /* Must pass a single mapped page for populating bootmem_region_list. */
+ init_boot_pages(__pa(&_end), xenheap_initial_phys_start);
xenheap_phys_end = DIRECTMAP_MBYTES << 20;
#else
if ( !xen_phys_start )
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