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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 CBBFEC433B4 for ; Thu, 1 Apr 2021 20:26:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A671A610CD for ; Thu, 1 Apr 2021 20:26:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235647AbhDAU0b (ORCPT ); Thu, 1 Apr 2021 16:26:31 -0400 Received: from mga14.intel.com ([192.55.52.115]:6556 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234488AbhDAU0Y (ORCPT ); Thu, 1 Apr 2021 16:26:24 -0400 IronPort-SDR: QKsUlsQMx1vEbIinXyW426j++O9MC1v4+t1O8A9TOibg+oqps/nZBEPo10PRcGrjDgxLMjikTx cvC1B0FMtDwQ== X-IronPort-AV: E=McAfee;i="6000,8403,9941"; a="191805698" X-IronPort-AV: E=Sophos;i="5.81,296,1610438400"; d="scan'208";a="191805698" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Apr 2021 13:26:24 -0700 IronPort-SDR: 5g9zpTfbeyFQgjU6fp0reRyn2v+f92PCVEjaicefK4fIAXMMnwAWxf2kzaXL4Er2KZnmZGWACG AkqAb6+Hu+sQ== X-IronPort-AV: E=Sophos;i="5.81,296,1610438400"; d="scan'208";a="611052873" Received: from pzlai-mobl.amr.corp.intel.com (HELO [10.213.169.242]) ([10.213.169.242]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Apr 2021 13:26:23 -0700 Subject: Re: [RFC v1 23/26] x86/tdx: Make pages shared in ioremap() To: Kuppuswamy Sathyanarayanan , Peter Zijlstra , Andy Lutomirski Cc: Andi Kleen , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Dan Williams , Raj Ashok , Sean Christopherson , linux-kernel@vger.kernel.org References: <33ced467eae950bc3df9e1f01284036fd560d33c.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <33ced467eae950bc3df9e1f01284036fd560d33c.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/5/21 3:38 PM, Kuppuswamy Sathyanarayanan wrote: > From: "Kirill A. Shutemov" > > All ioremap()ed paged that are not backed by normal memory (NONE or > RESERVED) have to be mapped as shared. s/paged/pages/ > +/* Make the page accesable by VMM */ > +#define pgprot_tdx_shared(prot) __pgprot(pgprot_val(prot) | tdx_shared_mask()) > + > #ifndef __ASSEMBLY__ > #include > #include > diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c > index 9e5ccc56f8e0..a0ba760866d4 100644 > --- a/arch/x86/mm/ioremap.c > +++ b/arch/x86/mm/ioremap.c > @@ -87,12 +87,12 @@ static unsigned int __ioremap_check_ram(struct resource *res) > } > > /* > - * In a SEV guest, NONE and RESERVED should not be mapped encrypted because > - * there the whole memory is already encrypted. > + * In a SEV or TDX guest, NONE and RESERVED should not be mapped encrypted (or > + * private in TDX case) because there the whole memory is already encrypted. > */ But doesn't this mean that we can't ioremap() normal memory? I was somehow expecting that we would need to do this for some host<->guest communication pages. > static unsigned int __ioremap_check_encrypted(struct resource *res) > { > - if (!sev_active()) > + if (!sev_active() && !is_tdx_guest()) > return 0; > > switch (res->desc) { > @@ -244,6 +244,8 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size, > prot = PAGE_KERNEL_IO; > if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted) > prot = pgprot_encrypted(prot); > + else if (is_tdx_guest()) > + prot = pgprot_tdx_shared(prot);