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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E9A24C30653 for ; Sun, 7 Jul 2024 09:16:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=3kQGKV8yt7sq4WXAb0XmLrAWHgzThLy3Ck6eSUBRlxI=; b=FZnawBQgvNPmrKK3Sppd9ZAJyp MbWsuIoDzTZ1iPvjLoP4dDXYZbf6OTQ/KS4s/AiW3XnaCOMGdmrv8hitxJyQzBo8SIs4xVe9HvrUR +gOfFai0Tbkwoim+rrbTjzfOUClMWa0/wR1hf3Vn5SuTlUKw4DwFYjX2OZmKLmNRNyFt9P+ECkYOa Dc4oXcDAJyrx1fFKKt7uAkSma29zpX/CPU3Zrv3M4relIlfJb9CB/1FVq/1ODNHsp55Dt3pDOR5F7 ZRLjKGBDr++udbV0Un/FSzV2w7wYF5Ehk+nH3+4GCSw86B/hbonIbJyKTUQab1uZxboN+nbB9f6Pf KlHT9YkA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sQO0b-00000001Zo1-1IVW; Sun, 07 Jul 2024 09:16:37 +0000 Received: from sin.source.kernel.org ([2604:1380:40e1:4800::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sQO0X-00000001ZnW-38g8 for linux-nvme@lists.infradead.org; Sun, 07 Jul 2024 09:16:35 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 1EE9BCE0861; Sun, 7 Jul 2024 09:16:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98E6FC3277B; Sun, 7 Jul 2024 09:16:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720343790; bh=izDf2P+sHbjiti59EE/8GV6nvVep7QKF5KGW0AiU1Mc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=CrzWOY/iDzSJOaiIMaP3xE97eiLSDi4CB0wI1+TEQAHNCz2g05KYsFt/aL1GPMP5r HBnYK2RTylUHc0Vx3NyVD3bOosNt0zckrQesG42uJ6MRet5D6FmAW0PeAe7m5PvfaN iwrSjlS4jkggMxmOqgmohWVRswxNEnNV8RBiej41b/zEaRlr+A3diLegBHOwF8ZWa6 9dtd/aY/wBeNy4rWL2+0ucK1I0ZgukePTbNlgwltGYYIXxXU7unResX6O/FNT5nk51 W41NViVj5N3M41fW4A1fLX7G15TRIE214CPnx2WARzr2ky472lBfuc0iEJOgY0DDB3 Pn2He452QkIyw== Date: Sun, 7 Jul 2024 12:16:26 +0300 From: Leon Romanovsky To: Christoph Hellwig Cc: Chaitanya Kulkarni , Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , "Zeng, Oak" , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?iso-8859-1?B?Suly9G1l?= Glisse , Andrew Morton , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-rdma@vger.kernel.org" , "iommu@lists.linux.dev" , "linux-nvme@lists.infradead.org" , "linux-pci@vger.kernel.org" , "kvm@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API Message-ID: <20240707091626.GH6695@unreal> References: <20240703054238.GA25366@lst.de> <20240703105253.GA95824@unreal> <20240703143530.GA30857@lst.de> <20240706062604.GA13874@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240706062604.GA13874@lst.de> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240707_021634_063420_46A1B90D X-CRM114-Status: GOOD ( 16.69 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Sat, Jul 06, 2024 at 08:26:04AM +0200, Christoph Hellwig wrote: > On Fri, Jul 05, 2024 at 10:53:06PM +0000, Chaitanya Kulkarni wrote: > > I tried to reproduce this issue somehow it is not reproducible. > > > > I'll try again on Leon's setup on my Saturday night, to fix that > > case. > > It is passthrough I/O from userspace. The address is not page aligned > as seen in the printk. Forcing bounce buffering of all passthrough > I/O makes it go away. > > The problem is the first mapped segment does not have to be aligned > and we're missing the code to places it at the aligned offset into > the IOVA space. Thanks for the explanation.