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 33387C433F5 for ; Thu, 24 Feb 2022 15:58:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236954AbiBXP7V (ORCPT ); Thu, 24 Feb 2022 10:59:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43564 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236910AbiBXP5v (ORCPT ); Thu, 24 Feb 2022 10:57:51 -0500 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82FF4131F7E for ; Thu, 24 Feb 2022 07:57:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645718231; x=1677254231; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8/5iP14Tg24GtfulUdmcNudmbOpBuYqe/UqX13ONj68=; b=J6qzH5tLQEOEbF5O+7LHo2IpZLy9O1s19K7C/q5QsPk3fXaIJ6XzRLHW +p4k0KOia2SLEMSDyGzL1+HgJBSnqTfHMGcBParkLR7sqyzZij8gLO8b8 v24X4fZ2MGUlRsU5qTtFcHCNBrPE09nVqyNX4xKpfCsakZjNdfqxv7zQD dE/2DBFrUo8ybP3l+PWa9wGTGkSDb4qe71Ff60yCDzfOeVOVswDrE7Ui2 lm0j1PnQanWyKABzmFg1MoDf6uGP5S8G1xHV39jjZN23UWBfaDmt46/hs bVeoJczaBoxbOyVVjddpaXpobTmGc9uHkMez7G4OtyKkAkD/UTIeB60Di Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10268"; a="315487715" X-IronPort-AV: E=Sophos;i="5.90,134,1643702400"; d="scan'208";a="315487715" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Feb 2022 07:56:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.90,134,1643702400"; d="scan'208";a="592128137" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga008.fm.intel.com with ESMTP; 24 Feb 2022 07:56:32 -0800 Received: by black.fi.intel.com (Postfix, from userid 1000) id 7E86EB34; Thu, 24 Feb 2022 17:56:35 +0200 (EET) From: "Kirill A. Shutemov" To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org Cc: sathyanarayanan.kuppuswamy@linux.intel.com, aarcange@redhat.com, ak@linux.intel.com, dan.j.williams@intel.com, david@redhat.com, hpa@zytor.com, jgross@suse.com, jmattson@google.com, joro@8bytes.org, jpoimboe@redhat.com, knsathya@kernel.org, pbonzini@redhat.com, sdeep@vmware.com, seanjc@google.com, tony.luck@intel.com, vkuznets@redhat.com, wanpengli@tencent.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, x86@kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv4 25/30] x86/tdx: Make pages shared in ioremap() Date: Thu, 24 Feb 2022 18:56:25 +0300 Message-Id: <20220224155630.52734-26-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220224155630.52734-1-kirill.shutemov@linux.intel.com> References: <20220224155630.52734-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In TDX guests, guest memory is protected from host access. If a guest performs I/O, it needs to explicitly share the I/O memory with the host. Make all ioremap()ed pages that are not backed by normal memory (IORES_DESC_NONE or IORES_DESC_RESERVED) mapped as shared. Since TDX memory encryption support is similar to AMD SEV architecture, reuse the infrastructure from AMD SEV code. Co-developed-by: Kuppuswamy Sathyanarayanan Signed-off-by: Kuppuswamy Sathyanarayanan Reviewed-by: Andi Kleen Reviewed-by: Tony Luck Signed-off-by: Kirill A. Shutemov --- arch/x86/mm/ioremap.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c index 026031b3b782..a5d4ec1afca2 100644 --- a/arch/x86/mm/ioremap.c +++ b/arch/x86/mm/ioremap.c @@ -242,10 +242,15 @@ __ioremap_caller(resource_size_t phys_addr, unsigned long size, * If the page being mapped is in memory and SEV is active then * make sure the memory encryption attribute is enabled in the * resulting mapping. + * In TDX guests, memory is marked private by default. If encryption + * is not requested (using encrypted), explicitly set decrypt + * attribute in all IOREMAPPED memory. */ prot = PAGE_KERNEL_IO; if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted) prot = pgprot_encrypted(prot); + else + prot = pgprot_decrypted(prot); switch (pcm) { case _PAGE_CACHE_MODE_UC: -- 2.34.1