From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B1581C433E6 for ; Wed, 3 Mar 2021 21:15:20 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 31B3064EF9 for ; Wed, 3 Mar 2021 21:15:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 31B3064EF9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id D08D16FAFB; Wed, 3 Mar 2021 21:15:19 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T6E6Uh4mZKQE; Wed, 3 Mar 2021 21:15:19 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp3.osuosl.org (Postfix) with ESMTP id CBC8E6F985; Wed, 3 Mar 2021 21:15:18 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id A6C13C000A; Wed, 3 Mar 2021 21:15:18 +0000 (UTC) Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 621D7C0001 for ; Wed, 3 Mar 2021 21:15:17 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id 5702984035 for ; Wed, 3 Mar 2021 21:15:17 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vXChyYEk79Ov for ; Wed, 3 Mar 2021 21:15:12 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by smtp1.osuosl.org (Postfix) with ESMTPS id BE0C88428F for ; Wed, 3 Mar 2021 21:15:12 +0000 (UTC) IronPort-SDR: akKkImNb9GL0WVcQprAZJI2Bj3nsBWR65GXoOeia6t3ngkFMM7HFkaIowLH1cZPNGAt+uWJV9x GdxaXC2c71MA== X-IronPort-AV: E=McAfee;i="6000,8403,9912"; a="251328623" X-IronPort-AV: E=Sophos;i="5.81,220,1610438400"; d="scan'208";a="251328623" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2021 13:15:11 -0800 IronPort-SDR: 4GumHzw+bqY2IuEknONcScAZW86HiX+ue90j58IjKak+hmhbzwOuAwfFlCGtOaA4n6eEKtFaub IoJjZGUM6C9g== X-IronPort-AV: E=Sophos;i="5.81,220,1610438400"; d="scan'208";a="406603184" Received: from jacob-builder.jf.intel.com (HELO jacob-builder) ([10.7.199.155]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2021 13:15:11 -0800 Date: Wed, 3 Mar 2021 13:17:26 -0800 From: Jacob Pan To: Tejun Heo Subject: Re: [RFC PATCH 15/18] cgroup: Introduce ioasids controller Message-ID: <20210303131726.7a8cb169@jacob-builder> In-Reply-To: References: <1614463286-97618-1-git-send-email-jacob.jun.pan@linux.intel.com> <1614463286-97618-16-git-send-email-jacob.jun.pan@linux.intel.com> Organization: OTC X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Cc: "Tian, Kevin" , Alex Williamson , Raj Ashok , Jonathan Corbet , Jean-Philippe Brucker , LKML , Dave Jiang , iommu@lists.linux-foundation.org, Li Zefan , Jason Gunthorpe , Johannes Weiner , cgroups@vger.kernel.org, Wu Hao , David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Hi Tejun, On Wed, 3 Mar 2021 10:44:28 -0500, Tejun Heo wrote: > 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? The interface definitely can be reused. But IOASID has a different behavior in terms of migration and ownership checking. I guess SEV key IDs are not tied to a process whereas IOASIDs are. Perhaps this can be solved by adding + .can_attach = ioasids_can_attach, + .cancel_attach = ioasids_cancel_attach, Let me give it a try and come back. Thanks for the pointer. Jacob > > Thanks. > Thanks, Jacob _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu