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

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Message-ID: <f781c3ea-8097-4e5f-84b2-0cd1f49bdb96@linux.dev>
Date: Wed, 3 Jul 2024 18:42:42 +0800
From: Zhu Yanjun <yanjun.zhu@...ux.dev>
To: Christoph Hellwig <hch@....de>, Leon Romanovsky <leon@...nel.org>
Cc: 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

在 2024/7/3 13:42, Christoph Hellwig 写道:
> 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

I also confronted this problem.IMO, if intel_iommu=off, the driver of 
drivers/iommu can not be used.

If I remember correctly, some guys in the first version can fix this 
problem. I will check the mails.

To me, I just revert this commit because I do not use this commit about 
nvme.

Zhu Yanjun

> it go away.
>