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Sender: Tejun Heo <htejun@gmail.com>
Date:   Wed, 3 Mar 2021 10:44:28 -0500
From:   Tejun Heo <tj@kernel.org>
To:     Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Joerg Roedel <joro@8bytes.org>,
        Lu Baolu <baolu.lu@linux.intel.com>,
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        Li Zefan <lizefan@huawei.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Jean-Philippe Brucker <jean-philippe@linaro.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        Eric Auger <eric.auger@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Raj Ashok <ashok.raj@intel.com>,
        "Tian, Kevin" <kevin.tian@intel.com>, Yi Liu <yi.l.liu@intel.com>,
        Wu Hao <hao.wu@intel.com>, Dave Jiang <dave.jiang@intel.com>
Subject: Re: [RFC PATCH 15/18] cgroup: Introduce ioasids controller
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On Sat, Feb 27, 2021 at 02:01:23PM -0800, Jacob Pan wrote:
> IOASIDs are used to associate DMA requests with virtual address spaces.
> They are a system-wide limited resource made available to the userspace
> applications. Let it be VMs or user-space device drivers.
> 
> This RFC patch introduces a cgroup controller to address the following
> problems:
> 1. Some user applications exhaust all the available IOASIDs thus
> depriving others of the same host.
> 2. System admins need to provision VMs based on their needs for IOASIDs,
> e.g. the number of VMs with assigned devices that perform DMA requests
> with PASID.

Please take a look at the proposed misc controller:

 http://lkml.kernel.org/r/20210302081705.1990283-2-vipinsh@google.com

Would that fit your bill?

Thanks.

-- 
tejun