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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 886D2C433DB for ; Thu, 18 Mar 2021 15:34:06 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (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 EBB1964E28 for ; Thu, 18 Mar 2021 15:34:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EBB1964E28 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=8bytes.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id B156646702; Thu, 18 Mar 2021 15:34:05 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FUjSsR9LNpkE; Thu, 18 Mar 2021 15:34:04 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTP id 7A3F343A93; Thu, 18 Mar 2021 15:34:04 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 4FCA8C000B; Thu, 18 Mar 2021 15:34:04 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id A3D02C0001 for ; Thu, 18 Mar 2021 15:34:02 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 83F8B43A93 for ; Thu, 18 Mar 2021 15:34:02 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MJwIXotQ1r_b for ; Thu, 18 Mar 2021 15:34:00 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from theia.8bytes.org (8bytes.org [81.169.241.247]) by smtp4.osuosl.org (Postfix) with ESMTPS id 632A146702 for ; Thu, 18 Mar 2021 15:34:00 +0000 (UTC) Received: by theia.8bytes.org (Postfix, from userid 1000) id 3EC7C2DA; Thu, 18 Mar 2021 16:33:56 +0100 (CET) Date: Thu, 18 Mar 2021 16:33:36 +0100 From: Joerg Roedel To: Suravee Suthikulpanit Subject: Re: [RFC PATCH 6/7] iommu/amd: Introduce amd_iommu_pgtable command-line option Message-ID: References: <20210312090411.6030-1-suravee.suthikulpanit@amd.com> <20210312090411.6030-7-suravee.suthikulpanit@amd.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210312090411.6030-7-suravee.suthikulpanit@amd.com> Cc: iommu@lists.linux-foundation.org, Jon.Grimm@amd.com, linux-kernel@vger.kernel.org, Wei.Huang2@amd.com 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" On Fri, Mar 12, 2021 at 03:04:10AM -0600, Suravee Suthikulpanit wrote: > To allow specification whether to use v1 or v2 IOMMU pagetable for > DMA remapping when calling kernel DMA-API. > > Signed-off-by: Suravee Suthikulpanit > --- > Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ > drivers/iommu/amd/init.c | 15 +++++++++++++++ > 2 files changed, 21 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 04545725f187..466e807369ea 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -319,6 +319,12 @@ > This mode requires kvm-amd.avic=1. > (Default when IOMMU HW support is present.) > > + amd_iommu_pgtable= [HW,X86-64] > + Specifies one of the following AMD IOMMU page table to > + be used for DMA remapping for DMA-API: > + v1 - Use v1 page table (Default) > + v2 - Use v2 page table Any reason v2 can not be the default when it is supported by the IOMMU? _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu