linux-kernel - Re: [RFC PATCH 15/18] cgroup: Introduce ioasids controller

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Date:   Thu, 4 Mar 2021 15:02:53 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
CC:     Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        David Woodhouse <dwmw2@...radead.org>,
        <iommu@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        "Jonathan Corbet" <corbet@....net>,
        Raj Ashok <ashok.raj@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
        Wu Hao <hao.wu@...el.com>, Dave Jiang <dave.jiang@...el.com>
Subject: Re: [RFC PATCH 15/18] cgroup: Introduce ioasids controller

On Thu, Mar 04, 2021 at 11:01:44AM -0800, Jacob Pan wrote:

> > For something like qemu I'd expect to put the qemu process in a cgroup
> > with 1 PASID. Who cares what qemu uses the PASID for, or how it was
> > allocated?
> 
> For vSVA, we will need one PASID per guest process. But that is up to the
> admin based on whether or how many SVA capable devices are directly
> assigned.

I hope the virtual IOMMU driver can communicate the PASID limit and
the cgroup machinery in the guest can know what the actual limit is.

I was thinking of a case where qemu is using a single PASID to setup
the guest kVA or similar

Jason