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 59D75C2BD09 for ; Wed, 3 Jul 2024 14:35:46 +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=MjGjVMn9WF3xLky3I9fG5D10KjXc7Z54E9jILWGvrLc=; b=YKCzpQxeIREK8Uk7R2vEM4f1jM kTBmcC4pAFvAD/k2/iGbooT+UVGSSlW3KbpJhqYIRjqxA1yhLbHQrqM0GSGQ/uO8N2VaAlrckhmce AzGY4+/lcLyaGgmwtnMuA8JGbRcFMnMM9ClZZwv46fc+/UPwZFrtusihBoXdzW9U/lMoQAS+LWadL YndBVqBr8UplUNi/GFo3zHqpItRNH0c9u5xsmF/4Kc5BzDuF71CMHV2xElicgwkRwcN+eabT6yGOR lgRquxsL0029g7bjR44sfZcVQn1cjkAMTXdFRckYs9l+BwOWFh/OQjVIt+Z/DyWWNrXFCS/xRJemn +ilD75yw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sP15D-0000000AUNe-15IQ; Wed, 03 Jul 2024 14:35:43 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sP159-0000000AULw-2lkZ for linux-nvme@lists.infradead.org; Wed, 03 Jul 2024 14:35:41 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id D1D0E68AFE; Wed, 3 Jul 2024 16:35:30 +0200 (CEST) Date: Wed, 3 Jul 2024 16:35:30 +0200 From: Christoph Hellwig To: Leon Romanovsky Cc: Christoph Hellwig , Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , "Zeng, Oak" , Chaitanya Kulkarni , 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: <20240703143530.GA30857@lst.de> References: <20240703054238.GA25366@lst.de> <20240703105253.GA95824@unreal> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240703105253.GA95824@unreal> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240703_073539_870189_F5953018 X-CRM114-Status: GOOD ( 18.27 ) 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 Wed, Jul 03, 2024 at 01:52:53PM +0300, Leon Romanovsky wrote: > On Wed, Jul 03, 2024 at 07:42:38AM +0200, Christoph Hellwig wrote: > > I just tried to boot this on my usual qemu test setup with emulated > > nvme devices, and it dead-loops with messages like this fairly late > > in the boot cycle: > > > > [ 43.826627] iommu: unaligned: iova 0xfff7e000 pa 0x000000010be33650 size 0x1000 min_pagesz 0x1000 > > [ 43.826982] dma_mapping_error -12 > > > > passing intel_iommu=off instead of intel_iommu=on (expectedly) makes > > it go away. > > Can you please share your kernel command line and qemu? > On my and Chaitanya setups it works fine. qemu-system-x86_64 \ -nographic \ -enable-kvm \ -m 6g \ -smp 4 \ -cpu host \ -M q35,kernel-irqchip=split \ -kernel arch/x86/boot/bzImage \ -append "root=/dev/vda console=ttyS0,115200n8 intel_iommu=on" \ -device intel-iommu,intremap=on \ -device ioh3420,multifunction=on,bus=pcie.0,id=port9-0,addr=9.0,chassis=0 \ -blockdev driver=file,cache.direct=on,node-name=root,filename=/home/hch/images/bookworm.img \ -blockdev driver=host_device,cache.direct=on,node-name=test,filename=/dev/nvme0n1p4 \ -device virtio-blk,drive=root \ -device nvme,drive=test,serial=1234