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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>
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@ -556,6 +556,36 @@ vmballoon_page_in_frames(enum vmballoon_page_size_type page_size)
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return 1 << vmballoon_page_order(page_size);
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}
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/**
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* vmballoon_mark_page_offline() - mark a page as offline
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* @page: pointer for the page.
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* @page_size: the size of the page.
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*/
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static void
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vmballoon_mark_page_offline(struct page *page,
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enum vmballoon_page_size_type page_size)
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{
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int i;
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for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
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__SetPageOffline(page + i);
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}
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/**
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* vmballoon_mark_page_online() - mark a page as online
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* @page: pointer for the page.
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* @page_size: the size of the page.
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*/
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static void
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vmballoon_mark_page_online(struct page *page,
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enum vmballoon_page_size_type page_size)
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{
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int i;
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for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
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__ClearPageOffline(page + i);
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}
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/**
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* vmballoon_send_get_target() - Retrieve desired balloon size from the host.
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*
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@ -612,6 +642,7 @@ static int vmballoon_alloc_page_list(struct vmballoon *b,
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ctl->page_size);
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if (page) {
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vmballoon_mark_page_offline(page, ctl->page_size);
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/* Success. Add the page to the list and continue. */
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list_add(&page->lru, &ctl->pages);
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continue;
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@ -850,6 +881,7 @@ static void vmballoon_release_page_list(struct list_head *page_list,
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list_for_each_entry_safe(page, tmp, page_list, lru) {
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list_del(&page->lru);
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vmballoon_mark_page_online(page, page_size);
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__free_pages(page, vmballoon_page_order(page_size));
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}
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