linux-kernel - Re: [PATCH v2 1/3] iommu/uapi: Define uapi version and capabilities

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Date:   Tue, 14 Apr 2020 01:11:07 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     "Tian, Kevin" <kevin.tian@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Raj, Ashok" <ashok.raj@...el.com>
Subject: Re: [PATCH v2 1/3] iommu/uapi: Define uapi version and capabilities

On Mon, Apr 13, 2020 at 01:41:57PM -0700, Jacob Pan wrote:
> Hi All,
> 
> Just a gentle reminder, any feedback on the options I listed below? New
> ideas will be even better.
> 
> Christoph, does the explanation make sense to you? We do have the
> capability/flag based scheme for IOMMU API extension, the version is
> mainly used for size lookup. Compatibility checking is another use of
> the version, it makes checking easy when a vIOMMU is launched.

No.  If you truely need different versions use different ioctl
identifiers.  If it really is just the size pass the size and not a
version.