From 8165540c7fbc4a638d53907d2d51de6751f4a8ab Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Tue, 5 Mar 2019 15:42:41 -0800
Subject: [PATCH] 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>
---
drivers/misc/vmw_balloon.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index f8240b87df229..869ec842729ef 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -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));
}
--
2.30.2