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Wed, 29 Jun 2022 08:55:29 -0500 Date: Wed, 29 Jun 2022 08:54:41 -0500 From: Michael Roth To: NOMURA =?utf-8?B?SlVOSUNISSjph47mnZHjgIDmt7PkuIAp?= CC: LKML , "x86@kernel.org" , "bp@suse.de" Subject: Re: [Regression v5.19-rc1] crash kexec fails to boot the 2nd kernel (Re: [PATCH v12 38/46] x86/sev: Add SEV-SNP feature detection/setup) Message-ID: <20220629135441.7w4ptweifvfyw5rc@amd.com> References: <20220629004114.zn5rurrmqdkiceun@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: 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-Office365-Filtering-Correlation-Id: faf4d4f2-5893-46d7-1bff-08da59d7079d X-MS-TrafficTypeDiagnostic: BN6PR12MB1378:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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:(13230016)(4636009)(136003)(39860400002)(396003)(346002)(376002)(40470700004)(46966006)(36840700001)(44832011)(6862004)(26005)(8936002)(5660300002)(70206006)(70586007)(8676002)(54906003)(316002)(4326008)(86362001)(82740400003)(81166007)(6666004)(478600001)(356005)(16526019)(82310400005)(2616005)(40480700001)(186003)(1076003)(83380400001)(336012)(40460700003)(36756003)(36860700001)(47076005)(426003)(2906002)(41300700001)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jun 2022 13:55:30.6299 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: faf4d4f2-5893-46d7-1bff-08da59d7079d 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: BN8NAM11FT011.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR12MB1378 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 29, 2022 at 07:38:09AM +0000, NOMURA JUNICHI(野村 淳一) wrote: > From: Michael Roth > > Thanks for the debug info. I haven't been able to reproduce this on the > > Milan or Cascade Lake systems I've tried, with kexec -l/-p, and well as > > with/without -s, so there may be something hardware/environment-specific > > going on here, so I could really use your help to test possible fixes. > > Sure. Thank you for trying to reproduce the problem. > > > > Other places that parses setup_data uses early_memremap() before > > > accessing the data (e.g. parse_setup_data()). I wonder if the lack of > > > remapping causes the problem but find_cc_blob is too early in the > > > boot process for early_memremap to work. > > > > I think this might be the case. Prior to early_memremap() being > > available, we need to rely on the initialize identity map set up by the > > decompression kernel. It has some stuff to add mappings for boot_params > > and whatnot, but I don't see where boot_params->hdr.setup_data is > > handled. > > > > If you use kexec -s to force kexec_file_load, then the kernel sets it up > > so that boot_params->hdr.setup_data points to some memory just after > > boot_params, and boot/compressed uses 2M pages in its identity map, so > > that generally ends up handling the whole range. > > > > But if you use kexec's default kexec_load functionality, setup_data might > > be allocated elsewhere, so in that case we might need explicit mapping. I > > noticed on my systems boot_params->hdr.setup_data seems to generally end > > up at 0x100000 for some reason, and maybe that addr just happens to > > get mapped for other reasons so I don't end up hitting the crash. > > > > Could you give it a shot with the kexec -s flag and so if that works? > > Your explanation makes a lot of sense. I could successfully boot the 2nd > kernel if "kexec -s" is used. Thanks for trying these, that's good to know. > > > If so, can you apply the below potential fix, and retry your original > > reproducer? > > I tried your potential fix but it didn't work... The symptom was same > as before. Sorry, I just noticed I had a typo in that patch which made it a no-op effectively. Can you give this a shot? diff --git a/arch/x86/boot/compressed/ident_map_64.c b/arch/x86/boot/compressed/ident_map_64.c index 44c350d627c7..b97b81d3697d 100644 --- a/arch/x86/boot/compressed/ident_map_64.c +++ b/arch/x86/boot/compressed/ident_map_64.c @@ -110,6 +110,7 @@ void kernel_add_identity_map(unsigned long start, unsigned long end) void initialize_identity_maps(void *rmode) { unsigned long cmdline; + struct setup_data *sd; /* Exclude the encryption mask from __PHYSICAL_MASK */ physical_mask &= ~sme_me_mask; @@ -163,6 +164,12 @@ void initialize_identity_maps(void *rmode) cmdline = get_cmd_line_ptr(); kernel_add_identity_map(cmdline, cmdline + COMMAND_LINE_SIZE); + sd = (struct setup_data *)boot_params->hdr.setup_data; + while (sd) { + kernel_add_identity_map((unsigned long)sd, (unsigned long)(sd + sizeof(*sd) + sd->len)); + sd = (struct setup_data *)sd->next; + } + sev_prep_identity_maps(top_level_pgt); /* Load the new page-table. */ > > -- > Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.