From patchwork Wed Jun 2 14:10:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brijesh Singh X-Patchwork-Id: 12294653 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 84817C47092 for ; Wed, 2 Jun 2021 14:11:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2C054610C8 for ; Wed, 2 Jun 2021 14:11:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2C054610C8 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amd.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BAD0D8E0001; Wed, 2 Jun 2021 10:11:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A5BB78E0017; Wed, 2 Jun 2021 10:11:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6897E8E0001; Wed, 2 Jun 2021 10:11:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0233.hostedemail.com [216.40.44.233]) by kanga.kvack.org (Postfix) with ESMTP id 2E8F08E0014 for ; Wed, 2 Jun 2021 10:11:39 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C70C982499A8 for ; Wed, 2 Jun 2021 14:11:38 +0000 (UTC) X-FDA: 78208971876.20.7BB14B0 Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2062.outbound.protection.outlook.com [40.107.236.62]) by imf27.hostedemail.com (Postfix) with ESMTP id 1690580192FE for ; Wed, 2 Jun 2021 14:11:25 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=AlSZLEjeg7eDOwUbgqJ0Bp0tPyZwXNsw1F4vK/gCQycbxyhEb78T4NoZD8SINKYqPCWc+0mi5fjtn8qVXc8SvhtoTRumqcZJ8bKAYIdbU4lVA/nObCE2AFPbV36lYn7VzTp275MT6l2mNzC61PodNtSxOl722RkkFYr5flv7/PZE16trTJ18rwB/siDB5JaU/LLdUukqOU3GWRqHsLzxOTMfs79+Sh4R2waJBxYrraINXd3AEWXz96TtFxovFBzi9fLaOI5zNxXYMA/kAatrYZJoAPTNCPqu36Prz52GaH2n4GCDZjV96JBys8lY5REaocf/lEJSLFrTMcpIG8/BWQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=o5FeCbgJvCPDvNZucTG6C/Be5DjljDLwjfU1yTbGz3c=; b=TY2unl9Bn0+gYOR5KBXrA78lSQxlA2K6KUgv7Vgg1iJbWO1Jmqu9ViVlGAdKzjpKPZRXQ/JjjsEWxHufCybRiNbTTIQCkcaILtkH5LEopt7M1471IYR1MaXnIXJUCV+kzJy1OnAGXn6kr63rdtrz/dYQbDHYFoBXMqxlFgpUDdN5hKN1koTohjREzqLq2t/pFXPWnAma5qAbiyA2+ywK+EYQ6EALkXqUtcFFyy+s8Ak3WWRoThIuAarMPc5wVxpjHl0sCmaWVEI0VIl5ByeS3jrDgK3xlSJPuq7QAM23RUwRsFMRYhY5UG3KV1Tmf35UalV28rUpNj/Sbo2aytjiZA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=o5FeCbgJvCPDvNZucTG6C/Be5DjljDLwjfU1yTbGz3c=; b=L1orI7FmTdpKRbgmDwBg96RjF/tICP0FErx2qc91HbJb1LTCoesCE7jNnnFzQ+eiXI6L21uggrZMstojC07lQoxBqC8iTQBlpdJcsiYI2MmP3twIyQgulXd+IVAqGAfPX1D/BrOrfWDAgUllNo4oI+3hC5YUY31IvokhH4btaoM= Received: from SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) by SN1PR12MB2368.namprd12.prod.outlook.com (2603:10b6:802:32::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4195.20; Wed, 2 Jun 2021 14:11:35 +0000 Received: from SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::9898:5b48:a062:db94]) by SN6PR12MB2718.namprd12.prod.outlook.com ([fe80::9898:5b48:a062:db94%6]) with mapi id 15.20.4173.030; Wed, 2 Jun 2021 14:11:35 +0000 From: Brijesh Singh To: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org Cc: Thomas Gleixner , Ingo Molnar , Joerg Roedel , Tom Lendacky , "H. Peter Anvin" , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , tony.luck@intel.com, npmccallum@redhat.com, Borislav Petkov , Brijesh Singh Subject: [PATCH Part2 RFC v3 05/37] x86/sev: Add RMP entry lookup helpers Date: Wed, 2 Jun 2021 09:10:25 -0500 Message-Id: <20210602141057.27107-6-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210602141057.27107-1-brijesh.singh@amd.com> References: <20210602141057.27107-1-brijesh.singh@amd.com> X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SA0PR11CA0056.namprd11.prod.outlook.com (2603:10b6:806:d0::31) To SN6PR12MB2718.namprd12.prod.outlook.com (2603:10b6:805:6f::22) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from sbrijesh-desktop.amd.com (165.204.77.1) by SA0PR11CA0056.namprd11.prod.outlook.com (2603:10b6:806:d0::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4195.20 via Frontend Transport; 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dkim=pass header.d=amd.com header.s=selector1 header.b=L1orI7Fm; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf27.hostedemail.com: domain of brijesh.singh@amd.com designates 40.107.236.62 as permitted sender) smtp.mailfrom=brijesh.singh@amd.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1690580192FE X-Stat-Signature: fruuf7skuqm1k9jnbsw4qg6x45a43o1g X-HE-Tag: 1622643085-481789 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The snp_lookup_page_in_rmptable() can be used by the host to read the RMP entry for a given page. The RMP entry format is documented in AMD PPR, see https://bugzilla.kernel.org/attachment.cgi?id=296015. Signed-off-by: Brijesh Singh --- arch/x86/include/asm/sev.h | 4 +-- arch/x86/kernel/sev.c | 28 +++++++++++++++++++++ include/linux/sev.h | 51 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 80 insertions(+), 3 deletions(-) create mode 100644 include/linux/sev.h diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index da2f757cd9bc..2764a438dbeb 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -9,6 +9,7 @@ #define __ASM_ENCRYPTED_STATE_H #include +#include #include #include @@ -74,9 +75,6 @@ struct cc_blob_sev_info { /* Software defined (when rFlags.CF = 1) */ #define PVALIDATE_FAIL_NOUPDATE 255 -/* RMP page size */ -#define RMP_PG_SIZE_4K 0 - /* Memory opertion for snp_prep_memory() */ enum snp_mem_op { MEMORY_PRIVATE, diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 172497d6cbb9..51676ab1a321 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -46,6 +46,10 @@ #define DR7_RESET_VALUE 0x400 +#define RMPTABLE_ENTRIES_OFFSET 0x4000 +#define RMPENTRY_SHIFT 8 +#define rmptable_page_offset(x) (RMPTABLE_ENTRIES_OFFSET + (((unsigned long)x) >> RMPENTRY_SHIFT)) + /* For early boot hypervisor communication in SEV-ES enabled guests */ static struct ghcb boot_ghcb_page __bss_decrypted __aligned(PAGE_SIZE); @@ -2198,3 +2202,27 @@ static int __init snp_rmptable_init(void) * passthough state, and it is available after subsys_initcall(). */ fs_initcall(snp_rmptable_init); + +struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level) +{ + unsigned long phys = page_to_pfn(page) << PAGE_SHIFT; + struct rmpentry *entry, *large_entry; + unsigned long vaddr; + + if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP)) + return NULL; + + vaddr = rmptable_start + rmptable_page_offset(phys); + if (unlikely(vaddr > rmptable_end)) + return NULL; + + entry = (struct rmpentry *)vaddr; + + /* Read a large RMP entry to get the correct page level used in RMP entry. */ + vaddr = rmptable_start + rmptable_page_offset(phys & PMD_MASK); + large_entry = (struct rmpentry *)vaddr; + *level = RMP_TO_X86_PG_LEVEL(rmpentry_pagesize(large_entry)); + + return entry; +} +EXPORT_SYMBOL_GPL(snp_lookup_page_in_rmptable); diff --git a/include/linux/sev.h b/include/linux/sev.h new file mode 100644 index 000000000000..83c89e999999 --- /dev/null +++ b/include/linux/sev.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * AMD Secure Encrypted Virtualization + * + * Author: Brijesh Singh + */ + +#ifndef __LINUX_SEV_H +#define __LINUX_SEV_H + +struct __packed rmpentry { + union { + struct { + u64 assigned : 1, + pagesize : 1, + immutable : 1, + rsvd1 : 9, + gpa : 39, + asid : 10, + vmsa : 1, + validated : 1, + rsvd2 : 1; + } info; + u64 low; + }; + u64 high; +}; + +#define rmpentry_assigned(x) ((x)->info.assigned) +#define rmpentry_pagesize(x) ((x)->info.pagesize) +#define rmpentry_vmsa(x) ((x)->info.vmsa) +#define rmpentry_asid(x) ((x)->info.asid) +#define rmpentry_validated(x) ((x)->info.validated) +#define rmpentry_gpa(x) ((unsigned long)(x)->info.gpa) +#define rmpentry_immutable(x) ((x)->info.immutable) + +/* RMP page size */ +#define RMP_PG_SIZE_4K 0 + +#define RMP_TO_X86_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M) + +#ifdef CONFIG_AMD_MEM_ENCRYPT +struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level); +#else +static inline struct rmpentry *snp_lookup_page_in_rmptable(struct page *page, int *level) +{ + return NULL; +} + +#endif /* CONFIG_AMD_MEM_ENCRYPT */ +#endif /* __LINUX_SEV_H */