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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB264C433F5 for ; Mon, 21 Mar 2022 10:23:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346295AbiCUKYp (ORCPT ); Mon, 21 Mar 2022 06:24:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346203AbiCUKYi (ORCPT ); Mon, 21 Mar 2022 06:24:38 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CE04635DCA for ; Mon, 21 Mar 2022 03:23:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1647858192; x=1679394192; h=message-id:date:mime-version:cc:subject:to:references: from:in-reply-to:content-transfer-encoding; bh=Y8pIweaAMyTCi93qGcfIHb2ZdfwxCLpe+KI0+IDSZLM=; b=WhTkGhnwfL6galtD5r3rVfT9kgqDUop1QvwwS+710I8jlOG1xt4d1g0z hMTdFGH/R10YBAxOtZZC4QedtHByowKBetZB4OW0Y7P9wkywhDA8KM2yr f2IQESvmbJHGqmXpuiOjP7tBVBxpuUbKTGKQdCwfpe276rqPPBo9qSCH5 5nt6yG3K/mA0X177lJkmlFoaIuuuYpePwGOkoEdNrSRJJE6aBe4Nnvgct R5aljzynlM/B2tfgP99RYUciv0XCsRkIv+W69iHDwMKpzoOVkLZP3P1NV xl+ofxNnIoXK0LGqTElFBsiQad6XMgpeGn7Uqg6qmVb18A8tzSRCYlMKZ Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10292"; a="257707602" X-IronPort-AV: E=Sophos;i="5.90,198,1643702400"; d="scan'208";a="257707602" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Mar 2022 03:23:12 -0700 X-IronPort-AV: E=Sophos;i="5.90,198,1643702400"; d="scan'208";a="559805481" Received: from blu2-mobl3.ccr.corp.intel.com (HELO [10.254.213.169]) ([10.254.213.169]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Mar 2022 03:23:08 -0700 Message-ID: <4f9d5857-c16d-8201-00ea-28f0cb6bbaf8@linux.intel.com> Date: Mon, 21 Mar 2022 18:23:07 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Cc: baolu.lu@linux.intel.com, Eric Auger , "Liu, Yi L" , "Pan, Jacob jun" , "iommu@lists.linux-foundation.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH RFC 02/11] iommu: Add iommu_domain type for SVA Content-Language: en-US To: "Tian, Kevin" , Joerg Roedel , Jason Gunthorpe , Christoph Hellwig , "Raj, Ashok" , Will Deacon , Robin Murphy , Jean-Philippe Brucker References: <20220320064030.2936936-1-baolu.lu@linux.intel.com> <20220320064030.2936936-3-baolu.lu@linux.intel.com> From: Lu Baolu In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2022/3/21 15:06, Tian, Kevin wrote: >> From: Lu Baolu >> Sent: Sunday, March 20, 2022 2:40 PM >> >> Add a new iommu domain type IOMMU_DOMAIN_SVA to represent an I/O >> page >> table which is shared from CPU host VA. Add a sva_cookie field in the >> iommu_domain structure to save the mm_struct which represent the CPU >> memory page table. >> >> Signed-off-by: Lu Baolu >> --- >> include/linux/iommu.h | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/include/linux/iommu.h b/include/linux/iommu.h >> index 36f43af0af53..3e179b853380 100644 >> --- a/include/linux/iommu.h >> +++ b/include/linux/iommu.h >> @@ -64,6 +64,9 @@ struct iommu_domain_geometry { >> #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity >> mapped */ >> #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses >> flush queue */ >> >> +#define __IOMMU_DOMAIN_SHARED (1U << 4) /* Page table shared from >> CPU */ >> +#define __IOMMU_DOMAIN_HOST_VA (1U << 5) /* Host CPU virtual >> address */ > suppose the SHARED bit will be also used for KVM page table sharing and > HOST_VA bit is to differentiate mm sharing from the latter? > Yes, that's my intention. Best regards, baolu