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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no 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 20365C432C0 for ; Thu, 28 Nov 2019 06:41:06 +0000 (UTC) Received: from fraxinus.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D68C1215A5 for ; Thu, 28 Nov 2019 06:41:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D68C1215A5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by fraxinus.osuosl.org (Postfix) with ESMTP id 72BB9868C9; Thu, 28 Nov 2019 06:41:05 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from fraxinus.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 18SdRMLpIZJ7; Thu, 28 Nov 2019 06:41:04 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by fraxinus.osuosl.org (Postfix) with ESMTP id A26BD86880; Thu, 28 Nov 2019 06:41:04 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 8701AC1DD5; Thu, 28 Nov 2019 06:41:04 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 08D9CC0881 for ; Thu, 28 Nov 2019 06:41:03 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id E69D487798 for ; Thu, 28 Nov 2019 06:41:02 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id deyyFFRRK2TE for ; Thu, 28 Nov 2019 06:41:01 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by whitealder.osuosl.org (Postfix) with ESMTPS id 759AC87797 for ; Thu, 28 Nov 2019 06:41:01 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id E117D68B05; Thu, 28 Nov 2019 07:40:56 +0100 (CET) Date: Thu, 28 Nov 2019 07:40:56 +0100 From: Christoph Hellwig To: David Rientjes Subject: Re: [bug] __blk_mq_run_hw_queue suspicious rcu usage Message-ID: <20191128064056.GA19822@lst.de> References: <20190905060627.GA1753@lst.de> <1d74607e-37f7-56ca-aba3-5a3bd7a68561@amd.com> <20190918132242.GA16133@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Cc: Jens Axboe , "Lendacky, Thomas" , "Singh, Brijesh" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Ming Lei , "iommu@lists.linux-foundation.org" , Peter Gonda , Keith Busch , Christoph Hellwig , Jianxiong Gao X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Wed, Nov 27, 2019 at 02:11:28PM -0800, David Rientjes wrote: > So we're left with making dma_pool_alloc(GFP_ATOMIC) actually be atomic > even when the DMA needs to be unencrypted for SEV. Christoph's suggestion > was to wire up dmapool in kernel/dma/remap.c for this. Is that necessary > to be done for all devices that need to do dma_pool_alloc(GFP_ATOMIC) or > can we do it within the DMA API itself so it's transparent to the driver? It needs to be transparent to the driver. Lots of drivers use GFP_ATOMIC dma allocations, and all of them are broken on SEV setups currently. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu