From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9E15EC388F9 for ; Sat, 31 Oct 2020 10:03:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A0A420791 for ; Sat, 31 Oct 2020 10:03:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604138581; bh=RcVqH4QpfTdhKUmK1CRBpxUNj2N2f538nnSCVZyV+xk=; h=Subject:To:Cc:From:Date:List-ID:From; b=VZye03H1EwzSJicqlR65JtacNoISxY4eYcVCry6/iEd9L2PbE7hQq9I2yxXXkucgP lmG4kpIHrsOWfV5q3eyNsbl6/hGkTkESh+R+zZmqOogp5cjW7D2hiddpSoOfWJx1wN 7S0Vj9+C2v0KeNbUUDT1XQZ23kDzyjjTxLDCaIow= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726651AbgJaKDB (ORCPT ); Sat, 31 Oct 2020 06:03:01 -0400 Received: from forward3-smtp.messagingengine.com ([66.111.4.237]:43893 "EHLO forward3-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726475AbgJaKDA (ORCPT ); Sat, 31 Oct 2020 06:03:00 -0400 Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailforward.nyi.internal (Postfix) with ESMTP id 8B7CD1942173; Sat, 31 Oct 2020 06:02:59 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Sat, 31 Oct 2020 06:02:59 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=v0mdGZ CZ9UbQe9zDMsao3sfBfWy5Vbls7+c0+WGOfgc=; b=KAJYrQTOdIMuYJroDwMnCR z+yWGWxOeLAB3+SO/Wv7nVIz563ZLkHdEPM1Xkk49tN4+vs01VVpatbcnIgVDZG0 jAD4horfJZ69CMmvJCLEDRdxQ77EfoR/ep2SLnRfUJRkOxbNVhf+HqNvBlX98Pnm 6Y6CdGKczgI7BKi0Cu0Ua7OoElRpRKw5x3csZP1X2j5dgulbkZPAOdUOxS4CVBLo f5N6062o1pTkTqId087kSjXGndFxTavNy63+iY/dWNtMdrVc8MA3t/xmAAFwerrb Bz+9yBVA34v1TFMckGni4r1iV4Ewd9rqrWK/s/xelOjsc0HQ1hYsjToNsOA6JUsA == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedrleejgdduudcutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecunecujfgurhepuffvhfffkfggtgfgsehtkeertddttd flnecuhfhrohhmpeeoghhrvghgkhhhsehlihhnuhigfhhouhhnuggrthhiohhnrdhorhhg qeenucggtffrrghtthgvrhhnpeelleelvdegfeelledtteegudegfffghfduffduudekge efleegieegkeejhfelveenucffohhmrghinhepkhgvrhhnvghlrdhorhhgnecukfhppeek fedrkeeirdejgedrieegnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrg hilhhfrhhomhepghhrvghgsehkrhhorghhrdgtohhm X-ME-Proxy: Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) by mail.messagingengine.com (Postfix) with ESMTPA id 74E343280059; Sat, 31 Oct 2020 06:02:58 -0400 (EDT) Subject: FAILED: patch "[PATCH] xen/gntdev.c: Mark pages as dirty" failed to apply to 4.19-stable tree To: jrdr.linux@gmail.com, boris.ostrovsky@oracle.com, david.vrabel@citrix.com, jgross@suse.com, jhubbard@nvidia.com Cc: From: Date: Sat, 31 Oct 2020 11:03:45 +0100 Message-ID: <160413862539217@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 779055842da5b2e508f3ccf9a8153cb1f704f566 Mon Sep 17 00:00:00 2001 From: Souptick Joarder Date: Sun, 6 Sep 2020 12:21:53 +0530 Subject: [PATCH] xen/gntdev.c: Mark pages as dirty There seems to be a bug in the original code when gntdev_get_page() is called with writeable=true then the page needs to be marked dirty before being put. To address this, a bool writeable is added in gnt_dev_copy_batch, set it in gntdev_grant_copy_seg() (and drop `writeable` argument to gntdev_get_page()) and then, based on batch->writeable, use set_page_dirty_lock(). Fixes: a4cdb556cae0 (xen/gntdev: add ioctl for grant copy) Suggested-by: Boris Ostrovsky Signed-off-by: Souptick Joarder Cc: John Hubbard Cc: Boris Ostrovsky Cc: Juergen Gross Cc: David Vrabel Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/1599375114-32360-1-git-send-email-jrdr.linux@gmail.com Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 64a9025a87be..1f32db7b72b2 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -720,17 +720,18 @@ struct gntdev_copy_batch { s16 __user *status[GNTDEV_COPY_BATCH]; unsigned int nr_ops; unsigned int nr_pages; + bool writeable; }; static int gntdev_get_page(struct gntdev_copy_batch *batch, void __user *virt, - bool writeable, unsigned long *gfn) + unsigned long *gfn) { unsigned long addr = (unsigned long)virt; struct page *page; unsigned long xen_pfn; int ret; - ret = get_user_pages_fast(addr, 1, writeable ? FOLL_WRITE : 0, &page); + ret = get_user_pages_fast(addr, 1, batch->writeable ? FOLL_WRITE : 0, &page); if (ret < 0) return ret; @@ -746,9 +747,13 @@ static void gntdev_put_pages(struct gntdev_copy_batch *batch) { unsigned int i; - for (i = 0; i < batch->nr_pages; i++) + for (i = 0; i < batch->nr_pages; i++) { + if (batch->writeable && !PageDirty(batch->pages[i])) + set_page_dirty_lock(batch->pages[i]); put_page(batch->pages[i]); + } batch->nr_pages = 0; + batch->writeable = false; } static int gntdev_copy(struct gntdev_copy_batch *batch) @@ -837,8 +842,9 @@ static int gntdev_grant_copy_seg(struct gntdev_copy_batch *batch, virt = seg->source.virt + copied; off = (unsigned long)virt & ~XEN_PAGE_MASK; len = min(len, (size_t)XEN_PAGE_SIZE - off); + batch->writeable = false; - ret = gntdev_get_page(batch, virt, false, &gfn); + ret = gntdev_get_page(batch, virt, &gfn); if (ret < 0) return ret; @@ -856,8 +862,9 @@ static int gntdev_grant_copy_seg(struct gntdev_copy_batch *batch, virt = seg->dest.virt + copied; off = (unsigned long)virt & ~XEN_PAGE_MASK; len = min(len, (size_t)XEN_PAGE_SIZE - off); + batch->writeable = true; - ret = gntdev_get_page(batch, virt, true, &gfn); + ret = gntdev_get_page(batch, virt, &gfn); if (ret < 0) return ret;