linux-kernel - RE: [PATCH v2 9/9] dmaengine: idxd: separate user and kernel pasid enabling

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Date:   Fri, 18 Mar 2022 06:28:50 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>
Subject: RE: [PATCH v2 9/9] dmaengine: idxd: separate user and kernel pasid
 enabling

> From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Sent: Tuesday, March 15, 2022 1:07 PM

The coverletter is [0/8] but here you actually have the 9th patch...

> 
> From: Dave Jiang <dave.jiang@...el.com>
> 
> The idxd driver always gated the pasid enabling under a single knob and
> this assumption is incorrect. The pasid used for kernel operation can be
> independently toggled and has no dependency on the user pasid (and vice
> versa). Split the two so they are independent "enabled" flags.

While you said kernel vs. user sva can be independently toggled you still
only have a single option 'sva' to gate both in the end. 

Thanks
Kevin