From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752116AbbASPrn (ORCPT ); Mon, 19 Jan 2015 10:47:43 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:54703 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751647AbbASPrm (ORCPT ); Mon, 19 Jan 2015 10:47:42 -0500 X-IronPort-AV: E=Sophos;i="5.09,427,1418083200"; d="scan'208";a="219312190" From: David Vrabel To: Andrew Morton , CC: David Vrabel , , "Jenny Herbert" Subject: [PATCH 2/2] mm: add 'foreign' alias for the 'pinned' page flag Date: Mon, 19 Jan 2015 15:47:23 +0000 Message-ID: <1421682443-20509-3-git-send-email-david.vrabel@citrix.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1421682443-20509-1-git-send-email-david.vrabel@citrix.com> References: <1421682443-20509-1-git-send-email-david.vrabel@citrix.com> MIME-Version: 1.0 Content-Type: text/plain X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jenny Herbert The foreign page flag will be used by Xen guests to mark pages that have grant mappings of frames from other (foreign) guests. The foreign flag is an alias for the existing (Xen-specific) pinned flag. This is safe because pinned is only used on pages used for page tables and these cannot also be foreign. Signed-off-by: Jenny Herbert Signed-off-by: David Vrabel --- include/linux/page-flags.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index e1f5fcd..5ed7bda 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -121,8 +121,12 @@ enum pageflags { PG_fscache = PG_private_2, /* page backed by cache */ /* XEN */ + /* Pinned in Xen as a read-only pagetable page. */ PG_pinned = PG_owner_priv_1, + /* Pinned as part of domain save (see xen_mm_pin_all()). */ PG_savepinned = PG_dirty, + /* Has a grant mapping of another (foreign) domain's page. */ + PG_foreign = PG_owner_priv_1, /* SLOB */ PG_slob_free = PG_private, @@ -215,6 +219,7 @@ __PAGEFLAG(Slab, slab) PAGEFLAG(Checked, checked) /* Used by some filesystems */ PAGEFLAG(Pinned, pinned) TESTSCFLAG(Pinned, pinned) /* Xen */ PAGEFLAG(SavePinned, savepinned); /* Xen */ +PAGEFLAG(Foreign, foreign); /* Xen */ PAGEFLAG(Reserved, reserved) __CLEARPAGEFLAG(Reserved, reserved) PAGEFLAG(SwapBacked, swapbacked) __CLEARPAGEFLAG(SwapBacked, swapbacked) __SETPAGEFLAG(SwapBacked, swapbacked) -- 1.7.10.4