From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from verein.lst.de (verein.lst.de [213.95.11.211])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id CD6EA17996;
	Wed,  3 Jul 2024 05:42:43 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.95.11.211
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1719985365; cv=none; b=jHYwAvBebV9RujS5U8flo8gjctvc72sxAHctIb2I8A8KD0KLkWww0TMTSxo2pAGQcigpcojiuUvBmB4GKpOzSPxx12xUn4551mkE9c5VfjJpOVi9EBfdkJy8n6uejFbrsnLWd3yvfY8Tejk7Z8MNArytKcoFweMFi1W6M2Sg6Co=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1719985365; c=relaxed/simple;
	bh=6WmyRvCngSkDLedfR0fbdwfNbhQErAClQWhqYP9cFps=;
	h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version:
	 Content-Type:Content-Disposition:In-Reply-To; b=UHcGgaO+Ff2jwJbFzg0iQVc7EbOYODYbx2eXAF8iS9BoS16v9mmraNfZDvbdUzVDFW2bnPwppKukJIKG6oxZIGOSZzkpcx6MlRQzT1VvMbot5qhleWFqCTMI7mac2uEBZSKNtde0Bxldf9A6OkZhPaFhRDrM/4XSzPmvCzppA44=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=pass smtp.mailfrom=lst.de; arc=none smtp.client-ip=213.95.11.211
Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de
Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lst.de
Received: by verein.lst.de (Postfix, from userid 2407)
	id A3C19227A87; Wed,  3 Jul 2024 07:42:38 +0200 (CEST)
Date: Wed, 3 Jul 2024 07:42:38 +0200
From: Christoph Hellwig <hch@lst.de>
To: Leon Romanovsky <leon@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Jason Gunthorpe <jgg@ziepe.ca>,
	Robin Murphy <robin.murphy@arm.com>, Joerg Roedel <joro@8bytes.org>,
	Will Deacon <will@kernel.org>, Keith Busch <kbusch@kernel.org>,
	Christoph Hellwig <hch@lst.de>, "Zeng, Oak" <oak.zeng@intel.com>,
	Chaitanya Kulkarni <kch@nvidia.com>,
	Sagi Grimberg <sagi@grimberg.me>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Yishai Hadas <yishaih@nvidia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>,
	Kevin Tian <kevin.tian@intel.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	=?iso-8859-1?B?Suly9G1l?= Glisse <jglisse@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	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: <20240703054238.GA25366@lst.de>
References: <cover.1719909395.git.leon@kernel.org>
Precedence: bulk
X-Mailing-List: linux-pci@vger.kernel.org
List-Id: <linux-pci.vger.kernel.org>
List-Subscribe: <mailto:linux-pci+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-pci+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <cover.1719909395.git.leon@kernel.org>
User-Agent: Mutt/1.5.17 (2007-11-01)

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.