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Commit 9be4d457 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge
Browse files

xen: add extra pages to balloon 



Add extra pages in the pseudo-physical address space to the balloon
so we can extend into them later.

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
parent e0419564

drivers/xen/balloon.c

+11 −4
Original line number Diff line number Diff line
@@ -119,7 +119,7 @@ static void scrub_page(struct page *page) 
}



/* balloon_append: add the given page to the balloon. */

static void balloon_append(struct page *page)

static void __balloon_append(struct page *page)

{

	/* Lowmem is re-populated first, so highmem pages go at list tail. */

	if (PageHighMem(page)) {
@@ -130,7 +130,11 @@ static void balloon_append(struct page *page) 
		list_add(&page->lru, &ballooned_pages);

		balloon_stats.balloon_low++;

	}

}



static void balloon_append(struct page *page)

{

	__balloon_append(page);

	totalram_pages--;

}
@@ -416,10 +420,13 @@ static int __init balloon_init(void) 
	register_balloon(&balloon_sysdev);



	/* Initialise the balloon with excess memory space. */

	for (pfn = xen_start_info->nr_pages; pfn < max_pfn; pfn++) {

	for (pfn = PFN_UP(xen_extra_mem_start);

	     pfn < PFN_DOWN(xen_extra_mem_start + xen_extra_mem_size);

	     pfn++) {

		page = pfn_to_page(pfn);

		if (!PageReserved(page))

			balloon_append(page);

		/* totalram_pages doesn't include the boot-time

		   balloon extension, so don't subtract from it. */

		__balloon_append(page);

	}



	target_watch.callback = watch_target;

include/xen/page.h

+7 −0
Original line number Diff line number Diff line 
#ifndef _XEN_PAGE_H

#define _XEN_PAGE_H



#include <asm/xen/page.h>



extern phys_addr_t xen_extra_mem_start, xen_extra_mem_size;



#endif	/* _XEN_PAGE_H */