From patchwork Mon Oct 16 13:27:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Roth X-Patchwork-Id: 13423441 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 373B3CDB465 for ; Mon, 16 Oct 2023 14:01:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233758AbjJPOBM (ORCPT ); Mon, 16 Oct 2023 10:01:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233594AbjJPOBG (ORCPT ); Mon, 16 Oct 2023 10:01:06 -0400 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2046.outbound.protection.outlook.com [40.107.244.46]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 629181BD9; Mon, 16 Oct 2023 06:50:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XKpySyAJZPf2sjy/vhRkOozeDbbz6J95hoqLT5gXiqfLL7rgM4PoeYNMFRMfkoUCZySsdehDD08Dja3QRXLQt6R/QS8jHVqr+xfNhPkWWmG4fHilhf+C/n0/JAmn6aVPv3J6aoUfvwi56TsDVb4Di6QQ5YEnh6QhPb8k4A5gntosXsbUwXcqk/OLHWnkfq2Xx5a+dryOS/0cGS1OIQtNgQNj5x0jQhk0HQAYAcNlGvtlDlKIP4zEuNdPhQuclmItDv4Cptm8pkvHV0K6pLkg54lHtElABbNsDuHGD8SEcB8h4fFifXnGaIH0nSRB5KYZI+OkoWouqPIPiMohy8DkEA== 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-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=K2jPFq3zSaAuWNyG4jBNg/BHf5AYOaiRiCgR8TmXnYg=; b=GCHUujVsvgCGpwoL/fe6+uEEevCrdXc50t2+Wwm5Xkw8AdsYcEekW8Njft46Pqzhk/qpG5iT5byzujs8AuprVad3+Zck0TaLL6b0I849ZOt1EKz2duCND9xJXKd/3+atB9szdiJP86HxEFePe5TDyeXuBrs/aga6ivGjCyGf3o3TfT9SSQ5WR7uhlDZ96eQajOrQDvW10/YXJtG9JJZ7ijNBZTdZIA139ycnuN9Tx5lca2ibH0vQvLus5Vbko46RfRVgg5ElzuUkwXW15TFuFXGbwkVfu6OMkwKRAXhBpwGUm2HSKDszQBuateRWzxku1++H68S9XMipseJcG7JCpg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); 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=K2jPFq3zSaAuWNyG4jBNg/BHf5AYOaiRiCgR8TmXnYg=; b=cR4TA750sF6P35N4nqGNslFPyR8MCRn3QMbBCE48P0pdmQXcuKhX6VVSu74sl5kIQdyf5eMUon9nHmJx1yPyBoJC2P5Yuoz/IciQhAEfBHQF/sZEF3yDkRZNCwNZ+b6wq9tEqToD5Yiju9emXM/8Yx7aLKITk8YHCyT4NGAPw9I= Received: from MN2PR05CA0034.namprd05.prod.outlook.com (2603:10b6:208:c0::47) by DM8PR12MB5399.namprd12.prod.outlook.com (2603:10b6:8:34::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6886.34; Mon, 16 Oct 2023 13:50:08 +0000 Received: from MN1PEPF0000F0E0.namprd04.prod.outlook.com (2603:10b6:208:c0:cafe::45) by MN2PR05CA0034.outlook.office365.com (2603:10b6:208:c0::47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6907.18 via Frontend Transport; Mon, 16 Oct 2023 13:50:08 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MN1PEPF0000F0E0.mail.protection.outlook.com (10.167.242.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6838.22 via Frontend Transport; Mon, 16 Oct 2023 13:50:08 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 16 Oct 2023 08:50:07 -0500 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh Subject: [PATCH v10 08/50] x86/fault: Add helper for dumping RMP entries Date: Mon, 16 Oct 2023 08:27:37 -0500 Message-ID: <20231016132819.1002933-9-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231016132819.1002933-1-michael.roth@amd.com> References: <20231016132819.1002933-1-michael.roth@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E0:EE_|DM8PR12MB5399:EE_ X-MS-Office365-Filtering-Correlation-Id: 3171d637-841f-4052-16dd-08dbce4ecf87 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: xl20aVboR70WIe8Xh3rdB/oQQ0cWBgrRIpCUPBzbusv4mW+tf9Ewae/m7p3fOCc871IpzYU2/NYedPgOHtvWVcmBwbXz01XU2WPx5UJrehdFG9DXoFdlun5UPg2XCYbPoDFhqyOt9/5aX1M4e13E9Yqp+16VHNV7/2fil3w2FqOCM/36GzweyVGX3zYkNgYgZPRgl3sidam548O/ZfmAIIBdaVY29pxQLIHDzjg7zoPi6No6B6xwxsB8kfPN4bpkqXimKyHekMWGv183+2ox9ULLv0io4/Hr82jhLAevZvdXPbxP67isM8OzrgL8Rg56XGlqHOP0HKeQmp6QdpAWi80Dn/aNd523mIUPfVqysd3y4FvaJVg6483e6+tnmow8Mc5fu9stZfVUB8tHL7N40Amist/vU30n0qokTeCK42Tg77dwM0RgT0uCEoWAlmVsWU1/7ay5aPJq2CUlFmvalyxCtzSFvnba461r1KkHPEXhmtErgaDUzZThZr11zUchpWCcEqkIKuyFXby6Sup57NDkijevrDCfRFZHCMxBeydE5ajobcu3uOZptsx3U9bn8Ofh2zbXHSBbIAo+mMtK3u7L9WFyFUlzGFplYPmuqx3Ll06SnxQQ0XCgRPQ604T7fHmkc2yC6Q2U/3Z96BlMZHC5LUUJ5Wqx2KhTHofReEKZG/YcFPtq33BQOAxHxzlupUhs6Y6ja+ru6IDcUkV3s616vCTsXpJCkdmJJI0XD4p+6uds/qfhOs0cA7nb/G1T6lu09bvNmfsRGVZaH+9GLw== X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(136003)(376002)(346002)(39860400002)(396003)(230922051799003)(451199024)(82310400011)(186009)(64100799003)(1800799009)(40470700004)(36840700001)(46966006)(40460700003)(40480700001)(82740400003)(36756003)(81166007)(36860700001)(47076005)(83380400001)(356005)(26005)(6666004)(16526019)(316002)(70586007)(70206006)(6916009)(478600001)(336012)(1076003)(54906003)(2616005)(426003)(2906002)(7416002)(7406005)(44832011)(41300700001)(86362001)(8676002)(8936002)(4326008)(5660300002)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2023 13:50:08.6783 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3171d637-841f-4052-16dd-08dbce4ecf87 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: MN1PEPF0000F0E0.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM8PR12MB5399 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Brijesh Singh This information will be useful for debugging things like page faults due to RMP access violations and RMPUPDATE failures. Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra [mdr: move helper to standalone patch] Signed-off-by: Michael Roth --- arch/x86/include/asm/sev-host.h | 2 + arch/x86/virt/svm/sev.c | 77 +++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/arch/x86/include/asm/sev-host.h b/arch/x86/include/asm/sev-host.h index 4c487ce8457f..bb06c57f2909 100644 --- a/arch/x86/include/asm/sev-host.h +++ b/arch/x86/include/asm/sev-host.h @@ -15,8 +15,10 @@ #ifdef CONFIG_KVM_AMD_SEV int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); +void sev_dump_hva_rmpentry(unsigned long address); #else static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENXIO; } +static inline void sev_dump_hva_rmpentry(unsigned long address) {} #endif #endif diff --git a/arch/x86/virt/svm/sev.c b/arch/x86/virt/svm/sev.c index 7d3802605376..cac3e311c38f 100644 --- a/arch/x86/virt/svm/sev.c +++ b/arch/x86/virt/svm/sev.c @@ -290,3 +290,80 @@ int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) return 0; } EXPORT_SYMBOL_GPL(snp_lookup_rmpentry); + +/* + * Dump the raw RMP entry for a particular PFN. These bits are documented in the + * PPR for a particular CPU model and provide useful information about how a + * particular PFN is being utilized by the kernel/firmware at the time certain + * unexpected events occur, such as RMP faults. + */ +static void sev_dump_rmpentry(u64 dumped_pfn) +{ + struct rmpentry e; + u64 pfn, pfn_end; + int level, ret; + u64 *e_data; + + ret = __snp_lookup_rmpentry(dumped_pfn, &e, &level); + if (ret) { + pr_info("Failed to read RMP entry for PFN 0x%llx, error %d\n", + dumped_pfn, ret); + return; + } + + e_data = (u64 *)&e; + if (e.assigned) { + pr_info("RMP entry for PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", + dumped_pfn, e_data[1], e_data[0]); + return; + } + + /* + * If the RMP entry for a particular PFN is not in an assigned state, + * then it is sometimes useful to get an idea of whether or not any RMP + * entries for other PFNs within the same 2MB region are assigned, since + * those too can affect the ability to access a particular PFN in + * certain situations, such as when the PFN is being accessed via a 2MB + * mapping in the host page table. + */ + pfn = ALIGN(dumped_pfn, PTRS_PER_PMD); + pfn_end = pfn + PTRS_PER_PMD; + + while (pfn < pfn_end) { + ret = __snp_lookup_rmpentry(pfn, &e, &level); + if (ret) { + pr_info_ratelimited("Failed to read RMP entry for PFN 0x%llx\n", pfn); + pfn++; + continue; + } + + if (e_data[0] || e_data[1]) { + pr_info("No assigned RMP entry for PFN 0x%llx, but the 2MB region contains populated RMP entries, e.g.: PFN 0x%llx: [high=0x%016llx low=0x%016llx]\n", + dumped_pfn, pfn, e_data[1], e_data[0]); + return; + } + pfn++; + } + + pr_info("No populated RMP entries in the 2MB region containing PFN 0x%llx\n", + dumped_pfn); +} + +void sev_dump_hva_rmpentry(unsigned long hva) +{ + unsigned int level; + pgd_t *pgd; + pte_t *pte; + + pgd = __va(read_cr3_pa()); + pgd += pgd_index(hva); + pte = lookup_address_in_pgd(pgd, hva, &level); + + if (pte) { + pr_info("Can't dump RMP entry for HVA %lx: no PTE/PFN found\n", hva); + return; + } + + sev_dump_rmpentry(pte_pfn(*pte)); +} +EXPORT_SYMBOL_GPL(sev_dump_hva_rmpentry);