linux-kernel - Re: [PATCH] iommu/s390: add iommu api for s390 pci devices

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Message-ID: <20150929124030.GI3036@8bytes.org>
Date:	Tue, 29 Sep 2015 14:40:30 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Gerald Schaefer <gerald.schaefer@...ibm.com>
Cc:	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH] iommu/s390: add iommu api for s390 pci devices

Hi Gerald,

thanks for your patch. It looks pretty good and addresses my previous
review comments. I have a few questions, first one is how this
operates with DMA-API on s390. Is there a seperate DMA-API
implementation besides the IOMMU-API one for PCI devices?

My other question is inline:

On Thu, Aug 27, 2015 at 03:33:03PM +0200, Gerald Schaefer wrote:
> +struct s390_domain_device {
> +	struct list_head	list;
> +	struct zpci_dev		*zdev;
> +};

Instead of using your own struct here, have you considered using the
struct iommu_group instead? The struct devices contains a pointer to an
iommu_group and the struct itself contains pointers to the domain it is
currently bound to.

Regards,

	Joerg

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