linux-kernel - Re: [RFC] /dev/ioasid uAPI proposal

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Message-ID: <6ca65628-1c0e-4ae3-6357-1493f993349e@linux.intel.com>
Date:   Tue, 1 Jun 2021 11:08:53 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        Liu Yi L <yi.l.liu@...ux.intel.com>
Cc:     baolu.lu@...ux.intel.com,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        David Woodhouse <dwmw2@...radead.org>,
        Jason Wang <jasowang@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kirti Wankhede <kwankhede@...dia.com>,
        "Alex Williamson (alex.williamson@...hat.com)" 
        <alex.williamson@...hat.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        David Gibson <david@...son.dropbear.id.au>
Subject: Re: [RFC] /dev/ioasid uAPI proposal

On 6/1/21 2:09 AM, Jason Gunthorpe wrote:
>>> device bind should fail if the device somehow isn't compatible with
>>> the scheme the user is tring to use.
>> yeah, I guess you mean to fail the device attach when the IOASID is a
>> nesting IOASID but the device is behind an iommu without nesting support.
>> right?
> Right..
>   

Just want to confirm...

Does this mean that we only support hardware nesting and don't want to
have soft nesting (shadowed page table in kernel) in IOASID?

Best regards,
baolu