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Peter Anvin" , Tony Luck , Dave Hansen , "Peter Zijlstra (Intel)" , Paolo Bonzini , Tom Lendacky , David Rientjes , Sean Christopherson Subject: [RFC Part2 PATCH 06/30] x86/fault: dump the RMP entry on #PF Date: Wed, 24 Mar 2021 12:04:12 -0500 Message-Id: <20210324170436.31843-7-brijesh.singh@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210324170436.31843-1-brijesh.singh@amd.com> References: <20210324170436.31843-1-brijesh.singh@amd.com> Content-Type: text/plain X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: SA0PR11CA0210.namprd11.prod.outlook.com (2603:10b6:806:1bc::35) 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 SA0PR11CA0210.namprd11.prod.outlook.com (2603:10b6:806:1bc::35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3977.25 via Frontend Transport; Wed, 24 Mar 2021 17:04:54 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: f488b2fe-b9ee-4718-fecb-08d8eee6f2a8 X-MS-TrafficTypeDiagnostic: SA0PR12MB4557: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6108; 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X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?slak0qRABXmMsRitjEDoJc4nVvIuF+f0WoNLSs7zyS/ewzBvRPY5/Q3H2L7O?= =?us-ascii?Q?LeuP3d7Ja1NnLK/Ge696J9mIr850Pbz3jBabikJk3ZUEEFliBN58qZaSLn5K?= =?us-ascii?Q?yhIjh/B6T+MVJMf6HoMb77lnk1UOMa+l4zKts2k/+/plyRA1Io9hzjWC+nRl?= =?us-ascii?Q?7gPa+MyeOPpiWZM2sPqDJ6U+UcAOJ6Io6ZD7NAr6HUpTWcy09fXM9S2tNZeK?= =?us-ascii?Q?5SOcST1zkJu/q2bFMX555RZmhjp+7m2rVmhjoX8L+J/kvc/0ffap5ioxhsIg?= =?us-ascii?Q?OvzHnoEV1n2oKnYwSLiskLQRSkl7yaD7/LLrX0s1XotYrx8u+ssfW5sJDy8C?= =?us-ascii?Q?g5uJwKxrFnXcwmLCPKvTpaGCHhwSmIDZpIHbRSJA7IqHQa5gs5tna/9HR0kO?= =?us-ascii?Q?ldA2FRWMumIm4SbV3ZVWZRWg+//OuJpaHg+uuDu/ciPEX0sio2Ezmy6wdiZ9?= =?us-ascii?Q?mbKUWEPvq1C/Ng3HE/Ve//GJGiyu8PqK8jDZARUllYTW/l15E4i/4HFcPBOx?= =?us-ascii?Q?3NjBMWajIRpw2KjpZ5dtUM0CbD9xP9tPD7J/RjUTiLbHAOJhg1FNchRSAo25?= =?us-ascii?Q?rvSQeAgBrbV2wvuiQaYEmyiUP2flA1b3NxylF5ZXIMqNQhxui/0m3eyMpfWG?= =?us-ascii?Q?pmnFmAllBE3aYbyUQDfIDDlUn3mQ9YrKjGbkfPSnzAyCQAsfxE7ZZdisp2Gq?= =?us-ascii?Q?gKyJkZNZmeWngk1yeZ8n42balS0z6NdAz5aKto27iHW5CC/1YeHw3t3+9bK4?= =?us-ascii?Q?tu7F8CP5SEmvbTTT0IVCGxVS54oMBNoIqytSaKOuwzEmtihkA97+TpCV+RoE?= =?us-ascii?Q?0I10lH/4jmiJM/A8AEVRemKyGqRNtXNNKQ6WC5wu0RPqskstXnhQ73CheFLz?= =?us-ascii?Q?tRc/w1XLAfXJEZrHmn12AYcRRb/UYzSDFX7GNuQm6Wn6RmeyRTKLVwCM26j0?= =?us-ascii?Q?TtOpEoRIfNYRKHKGcbG8BQnKAcAaKWkIFiqZnBpCxQXwpbedISC0xFQzLOow?= =?us-ascii?Q?s9o27tJEYTzRJzxLruEBSr1iQY40Lfzhz5LdDzRS/hFg84VMTx7UTDzNI7gI?= =?us-ascii?Q?QmvmRJhT4vkTJu3wbaKGM/qsxcKDe3CfEZIvLyTLUg57aMm9RcsRyNNjrx32?= =?us-ascii?Q?OQnhxwFzd23giv2eWPW4LFzMSf3dTxgDVhET1Sw2+booVD4izikWLQ0ZictB?= =?us-ascii?Q?wcTRHfv/pyysAzWl2s5800EE+P51bOQA53dwfkopMMPtCjuqk8uTj1HKSYBP?= =?us-ascii?Q?5yxStWj17MJXRRIzGGR/MoxlQWET+TQCBw4gXt3TmUlbGG0TTnTNRjzpHBcn?= =?us-ascii?Q?wQwhFIHETEFeRQg+qVjeTRX4?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: f488b2fe-b9ee-4718-fecb-08d8eee6f2a8 X-MS-Exchange-CrossTenant-AuthSource: SN6PR12MB2718.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2021 17:04:55.5924 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: HTp773CCWwOLEJaubrYa7cRAdodqgjeq78DS3gYfEz0OMg2jo+SOy9Y0LR1JAl1SIgV5RlVP8oypsM+5wwWTYQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4557 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org If hardware detects an RMP violation, it will raise a page-fault exception with the RMP bit set. To help the debug, dump the RMP entry of the faulting address. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Joerg Roedel Cc: "H. Peter Anvin" Cc: Tony Luck Cc: Dave Hansen Cc: "Peter Zijlstra (Intel)" Cc: Paolo Bonzini Cc: Tom Lendacky Cc: David Rientjes Cc: Sean Christopherson Cc: x86@kernel.org Cc: kvm@vger.kernel.org Signed-off-by: Brijesh Singh --- arch/x86/mm/fault.c | 75 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index f39b551f89a6..7605e06a6dd9 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -31,6 +31,7 @@ #include /* VMALLOC_START, ... */ #include /* kvm_handle_async_pf */ #include /* fixup_vdso_exception() */ +#include /* lookup_rmpentry ... */ #define CREATE_TRACE_POINTS #include @@ -147,6 +148,76 @@ is_prefetch(struct pt_regs *regs, unsigned long error_code, unsigned long addr) DEFINE_SPINLOCK(pgd_lock); LIST_HEAD(pgd_list); +static void dump_rmpentry(struct page *page, rmpentry_t *e) +{ + unsigned long paddr = page_to_pfn(page) << PAGE_SHIFT; + + pr_alert("RMPEntry paddr 0x%lx [assigned=%d immutable=%d pagesize=%d gpa=0x%lx asid=%d " + "vmsa=%d validated=%d]\n", paddr, rmpentry_assigned(e), rmpentry_immutable(e), + rmpentry_pagesize(e), rmpentry_gpa(e), rmpentry_asid(e), rmpentry_vmsa(e), + rmpentry_validated(e)); + pr_alert("RMPEntry paddr 0x%lx %016llx %016llx\n", paddr, e->high, e->low); +} + +static void show_rmpentry(unsigned long address) +{ + struct page *page = virt_to_page(address); + rmpentry_t *entry, *large_entry; + int level, rmp_level; + pgd_t *pgd; + pte_t *pte; + + /* Get the RMP entry for the fault address */ + entry = lookup_page_in_rmptable(page, &rmp_level); + if (!entry) { + pr_alert("SEV-SNP: failed to read RMP entry for address 0x%lx\n", address); + return; + } + + dump_rmpentry(page, entry); + + /* + * If fault occurred during the large page walk, dump the RMP entry at base of 2MB page. + */ + pgd = __va(read_cr3_pa()); + pgd += pgd_index(address); + pte = lookup_address_in_pgd(pgd, address, &level); + if ((level > PG_LEVEL_4K) && (!IS_ALIGNED(address, PMD_SIZE))) { + address = address & PMD_MASK; + large_entry = lookup_page_in_rmptable(virt_to_page(address), &rmp_level); + if (!large_entry) { + pr_alert("SEV-SNP: failed to read large RMP entry 0x%lx\n", + address & PMD_MASK); + return; + } + + dump_rmpentry(virt_to_page(address), large_entry); + } + + /* + * If the RMP entry at the faulting address was not assigned, then dump may not provide + * any useful debug information. Iterate through the entire 2MB region, and dump the RMP + * entries if one of the bit in the RMP entry is set. + */ + if (!rmpentry_assigned(entry)) { + unsigned long start, end; + + start = address & PMD_MASK; + end = start + PMD_SIZE; + + for (; start < end; start += PAGE_SIZE) { + entry = lookup_page_in_rmptable(virt_to_page(start), &rmp_level); + if (!entry) + return; + + /* If any of the bits in RMP entry is set then dump it */ + if (entry->high || entry->low) + pr_alert("RMPEntry paddr %lx: %016llx %016llx\n", + page_to_pfn(page) << PAGE_SHIFT, entry->high, entry->low); + } + } +} + #ifdef CONFIG_X86_32 static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address) { @@ -580,6 +651,10 @@ show_fault_oops(struct pt_regs *regs, unsigned long error_code, unsigned long ad } dump_pagetable(address); + + if (error_code & X86_PF_RMP) + show_rmpentry(address); + } static noinline void -- 2.17.1