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authorJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-09-14 17:32:32 (GMT)
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-11-20 06:18:26 (GMT)
commit66946f676776a6ef333db1cf7453ecf8a66c90df (patch)
tree9eefb0b95ae97cef89bec299fb0ecc1f3d9e6103 /drivers/xen
parent2f70e0acd496398671606767122846278126a88b (diff)
downloadlinux-66946f676776a6ef333db1cf7453ecf8a66c90df.tar.xz
xen/balloon: make sure we only include remaining extra ram
If the user specifies mem= on the kernel command line, some or all of the extra memory E820 region may be clipped away, so make sure we don't try to add more extra memory than exists in E820. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/balloon.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 77b5dc3..2b17ad5 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -50,6 +50,7 @@
#include <asm/pgtable.h>
#include <asm/uaccess.h>
#include <asm/tlb.h>
+#include <asm/e820.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
@@ -391,7 +392,7 @@ static struct notifier_block xenstore_notifier;
static int __init balloon_init(void)
{
- unsigned long pfn;
+ unsigned long pfn, extra_pfn_end;
struct page *page;
if (!xen_pv_domain())
@@ -412,8 +413,10 @@ static int __init balloon_init(void)
register_balloon(&balloon_sysdev);
/* Initialise the balloon with excess memory space. */
+ extra_pfn_end = min(e820_end_of_ram_pfn(),
+ (unsigned long)PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size));
for (pfn = PFN_UP(xen_extra_mem_start);
- pfn < PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size);
+ pfn < extra_pfn_end;
pfn++) {
page = pfn_to_page(pfn);
/* totalram_pages doesn't include the boot-time