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xen: allow balloon driver to use more than one memory region

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Allow the xen balloon driver to populate its list of extra pages from
more than one region of memory.  This will allow platforms to provide
(for example) a region of low memory and a region of high memory.

The maximum possible number of extra regions is 128 (== E820MAX) which
is quite large so xen_extra_mem is placed in __initdata.  This is safe
as both xen_memory_setup() and balloon_init() are in __init.

The balloon regions themselves are not altered (i.e., there is still
only the one region).

Signed-off-by: David Vrabel <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
David Vrabel 2011-09-28 17:46:34 +01:00 • committed by Konrad Rzeszutek Wilk
commit 8b5d44a5ac
3 changed files with 46 additions and 28 deletions
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44
drivers/xen/balloon.c
View file

@ -555,11 +555,32 @@ void free_xenballooned_pages(int nr_pages, struct page** pages)
}
EXPORT_SYMBOL(free_xenballooned_pages);
static int __init balloon_init(void)
static void __init balloon_add_region(unsigned long start_pfn,
unsigned long pages)
{
unsigned long pfn, extra_pfn_end;
struct page *page;
/*
* If the amount of usable memory has been limited (e.g., with
* the 'mem' command line parameter), don't add pages beyond
* this limit.
*/
extra_pfn_end = min(max_pfn, start_pfn + pages);
for (pfn = start_pfn; pfn < extra_pfn_end; pfn++) {
page = pfn_to_page(pfn);
/* totalram_pages and totalhigh_pages do not
include the boot-time balloon extension, so
don't subtract from it. */
__balloon_append(page);
}
}
static int __init balloon_init(void)
{
int i;
if (!xen_domain())
return -ENODEV;
@ -587,23 +608,12 @@ static int __init balloon_init(void)
/*
* Initialize the balloon with pages from the extra memory
* region (see arch/x86/xen/setup.c).
*
* If the amount of usable memory has been limited (e.g., with
* the 'mem' command line parameter), don't add pages beyond
* this limit.
* regions (see arch/x86/xen/setup.c).
*/
extra_pfn_end = min(max_pfn,
(unsigned long)PFN_DOWN(xen_extra_mem_start
+ xen_extra_mem_size));
for (pfn = PFN_UP(xen_extra_mem_start);
pfn < extra_pfn_end;
pfn++) {
page = pfn_to_page(pfn);
/* totalram_pages and totalhigh_pages do not include the boot-time
balloon extension, so don't subtract from it. */
__balloon_append(page);
}
for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++)
if (xen_extra_mem[i].size)
balloon_add_region(PFN_UP(xen_extra_mem[i].start),
PFN_DOWN(xen_extra_mem[i].size));
return 0;
}