hv_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. Link: http://lkml.kernel.org/r/20181119101616.8901-6-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Acked-by: Pankaj gupta <pagupta@redhat.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: Kairui Song <kasong@redhat.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.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: Arnd Bergmann <arnd@arndb.de> 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Juergen Gross <jgross@suse.com> Cc: Julien Freche <jfreche@vmware.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: 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: Nadav Amit <namit@vmware.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Omar Sandoval <osandov@fb.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 Rothwell <sfr@canb.auug.org.au> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Xavier Deguillard <xdeguillard@vmware.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -681,8 +681,13 @@ static struct notifier_block hv_memory_nb = {
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/* Check if the particular page is backed and can be onlined and online it. */
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static void hv_page_online_one(struct hv_hotadd_state *has, struct page *pg)
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{
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if (!has_pfn_is_backed(has, page_to_pfn(pg)))
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if (!has_pfn_is_backed(has, page_to_pfn(pg))) {
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if (!PageOffline(pg))
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__SetPageOffline(pg);
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return;
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}
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if (PageOffline(pg))
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__ClearPageOffline(pg);
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/* This frame is currently backed; online the page. */
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__online_page_set_limits(pg);
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@ -1202,6 +1207,7 @@ static void free_balloon_pages(struct hv_dynmem_device *dm,
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for (i = 0; i < num_pages; i++) {
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pg = pfn_to_page(i + start_frame);
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__ClearPageOffline(pg);
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__free_page(pg);
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dm->num_pages_ballooned--;
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}
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@ -1214,7 +1220,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
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struct dm_balloon_response *bl_resp,
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int alloc_unit)
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{
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unsigned int i = 0;
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unsigned int i, j;
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struct page *pg;
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if (num_pages < alloc_unit)
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@ -1246,6 +1252,10 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
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if (alloc_unit != 1)
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split_page(pg, get_order(alloc_unit << PAGE_SHIFT));
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/* mark all pages offline */
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for (j = 0; j < (1 << get_order(alloc_unit << PAGE_SHIFT)); j++)
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__SetPageOffline(pg + j);
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bl_resp->range_count++;
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bl_resp->range_array[i].finfo.start_page =
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page_to_pfn(pg);
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