linux-kernel - Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

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Message-ID: <20240703143530.GA30857@lst.de>
Date: Wed, 3 Jul 2024 16:35:30 +0200
From: Christoph Hellwig <hch@....de>
To: Leon Romanovsky <leon@...nel.org>
Cc: Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Jason Gunthorpe <jgg@...pe.ca>, Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Keith Busch <kbusch@...nel.org>, "Zeng, Oak" <oak.zeng@...el.com>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rdma@...r.kernel.org, iommu@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC PATCH v1 00/18] Provide a new two step DMA API mapping API

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