Commit 8165540c authored Mar 05, 2019 by David Hildenbrand Committed by Linus Torvalds Mar 05, 2019

vmw_balloon: mark inflated pages PG_offline

Mark inflated and never onlined pages PG_offline, to tell the world that
the content is stale and should not be dumped.

[david@redhat.com: use vmballoon_page_in_frames more widely]
  Link: http://lkml.kernel.org/r/20181122100627.5189-7-david@redhat.com
Link: http://lkml.kernel.org/r/20181119101616.8901-7-david@redhat.com


Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Nadav Amit <namit@vmware.com>
Cc: Xavier Deguillard <xdeguillard@vmware.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Julien Freche <jfreche@vmware.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Christian Hansen <chansen3@cisco.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juergen Gross <jgross@suse.com>
Cc: Kairui Song <kasong@redhat.com>
Cc: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Lianbo Jiang <lijiang@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Miles Chen <miles.chen@mediatek.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Pankaj gupta <pagupta@redhat.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent fae42c4d

drivers/misc/vmw_balloon.c

+32 −0

Original line number	Diff line number	Diff line
		@@ -556,6 +556,36 @@ vmballoon_page_in_frames(enum vmballoon_page_size_type page_size)
		return 1 << vmballoon_page_order(page_size);
		}

		/**
		* vmballoon_mark_page_offline() - mark a page as offline
		* @page: pointer for the page.
		* @page_size: the size of the page.
		*/
		static void
		vmballoon_mark_page_offline(struct page *page,
		enum vmballoon_page_size_type page_size)
		{
		int i;

		for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
		__SetPageOffline(page + i);
		}

		/**
		* vmballoon_mark_page_online() - mark a page as online
		* @page: pointer for the page.
		* @page_size: the size of the page.
		*/
		static void
		vmballoon_mark_page_online(struct page *page,
		enum vmballoon_page_size_type page_size)
		{
		int i;

		for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
		__ClearPageOffline(page + i);
		}

		/**
		* vmballoon_send_get_target() - Retrieve desired balloon size from the host.
		*
		@@ -612,6 +642,7 @@ static int vmballoon_alloc_page_list(struct vmballoon *b,
		ctl->page_size);

		if (page) {
		vmballoon_mark_page_offline(page, ctl->page_size);
		/* Success. Add the page to the list and continue. */
		list_add(&page->lru, &ctl->pages);
		continue;
		@@ -850,6 +881,7 @@ static void vmballoon_release_page_list(struct list_head *page_list,

		list_for_each_entry_safe(page, tmp, page_list, lru) {
		list_del(&page->lru);
		vmballoon_mark_page_online(page, page_size);
		__free_pages(page, vmballoon_page_order(page_size));
		}