diff options
| -rw-r--r-- | arch/x86/xen/setup.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c index a8a66a50d446..2a4add9634ce 100644 --- a/arch/x86/xen/setup.c +++ b/arch/x86/xen/setup.c @@ -194,6 +194,14 @@ char * __init xen_memory_setup(void) end -= delta; extra_pages += PFN_DOWN(delta); + /* + * Set RAM below 4GB that is not for us to be unusable. + * This prevents "System RAM" address space from being + * used as potential resource for I/O address (happens + * when 'allocate_resource' is called). + */ + if (delta && end < 0x100000000UL) + e820_add_region(end, delta, E820_UNUSABLE); } if (map[i].size > 0 && end > xen_extra_mem_start) |