linux-kernel - Re: [PATCH v2 03/16] iommu: introduce iommu invalidate API function

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Message-ID: <3cdbce19-9264-b2d0-745b-8d32d5b8cfe7@arm.com>
Date:   Wed, 11 Oct 2017 13:48:00 +0100
From:   Jean-Philippe Brucker <jean-philippe.brucker@....com>
To:     Joerg Roedel <joro@...tes.org>, "Liu, Yi L" <yi.l.liu@...el.com>
Cc:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "Lan, Tianyu" <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...ux.intel.com>
Subject: Re: [PATCH v2 03/16] iommu: introduce iommu invalidate API function

On 11/10/17 13:15, Joerg Roedel wrote:
> On Wed, Oct 11, 2017 at 11:54:52AM +0000, Liu, Yi L wrote:
>> I didn't quite get 'iovm' mean. Can you explain a bit about the idea?
> 
> It's short for IO Virtual Memory, basically a replacement term for 'svm'
> that is not ambiguous (afaik) and not specific to Intel.

I wonder if SVM originated in OpenCL first, rather than intel? That's why
I'm using it, but it is ambiguous. I'm not sure IOVM is precise enough
though, since the name could as well be used without shared tables, for
classical map/unmap and IOVAs. Kevin Tian suggested SVA "Shared Virtual
Addressing" last time, which is a little more clear than SVM and isn't
used elsewhere in the kernel either.

Thanks,
Jean