diff options
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-09-29 16:54:33 -0700 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-10-22 12:57:32 -0700 |
| commit | 3654581e47adc07072aebe239818485b68ea04f0 (patch) | |
| tree | 1496912323225c1d1b5186dffedf58f6b9c08388 /arch/x86 | |
| parent | 41f2e4771a4f1ba26c35438daf32917b9ef7858d (diff) | |
xen: don't add extra_pages for RAM after mem_end
If an E820 region is entirely beyond mem_end, don't attempt to truncate
it and add the truncated pages to extra_pages, as they will be negative.
Also, make sure the extra memory region starts after all BIOS provided
E820 regions (and in the case of RAM regions, post-clipping).
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/xen/setup.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index cad2fcd130e..7a4ab05cff8 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -52,20 +52,19 @@ phys_addr_t xen_extra_mem_start, xen_extra_mem_size; static __init void xen_add_extra_mem(unsigned long pages) { u64 size = (u64)pages * PAGE_SIZE; + u64 extra_start = xen_extra_mem_start + xen_extra_mem_size; if (!pages) return; - e820_add_region(xen_extra_mem_start + xen_extra_mem_size, size, E820_RAM); + e820_add_region(extra_start, size, E820_RAM); sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map); - reserve_early(xen_extra_mem_start + xen_extra_mem_size, - xen_extra_mem_start + xen_extra_mem_size + size, - "XEN EXTRA"); + reserve_early(extra_start, extra_start + size, "XEN EXTRA"); xen_extra_mem_size += size; - xen_max_p2m_pfn = PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size); + xen_max_p2m_pfn = PFN_DOWN(extra_start + size); } static unsigned long __init xen_release_chunk(phys_addr_t start_addr, @@ -175,15 +174,21 @@ char * __init xen_memory_setup(void) unsigned long long end = map[i].addr + map[i].size; if (map[i].type == E820_RAM) { - if (end > mem_end) { + if (map[i].addr < mem_end && end > mem_end) { /* Truncate region to max_mem. */ - map[i].size -= end - mem_end; + u64 delta = end - mem_end; - extra_pages += PFN_DOWN(end - mem_end); + map[i].size -= delta; + extra_pages += PFN_DOWN(delta); + + end = mem_end; } - } else if (map[i].type != E820_RAM) + } + + if (end > xen_extra_mem_start) xen_extra_mem_start = end; + /* If region is non-RAM or below mem_end, add what remains */ if ((map[i].type != E820_RAM || map[i].addr < mem_end) && map[i].size > 0) e820_add_region(map[i].addr, map[i].size, map[i].type); |