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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=tLLMue0pia2RSHPtu+KRxD5gYBb/zBQVw+kdxIB/vzQ=; b=iNiwmYoOSNdCqewcRfI/c1ZLFZoKeVs5Sz1I4qtPXua61IMR8LMN89uh37l8X9hpicVjST4+frwwMDE9LdFRQWcE8JqBRqMJJN5Z8kBTJch53B70JIjCNkpqLI70Gpu+up105gE06Q0EGeo2od8kr2M94coirYEd8jlSFw85nLc= Subject: Re: regression in recent pvops kernels, dom0 crashes early To: Olaf Hering CC: References: <20210513122457.4182eb7f.olaf@aepfle.de> <378acbb3-7bb0-6512-2e68-0a6999926811@citrix.com> <20210513142229.2d2aa0b4.olaf@aepfle.de> <389f9d76-ed23-f8ee-6081-322699d7e816@citrix.com> <20210513150033.2448f533.olaf@aepfle.de> From: Andrew Cooper Message-ID: <67d1fb0f-1cbc-07b7-2224-8f9762b3a7c9@citrix.com> Date: Thu, 13 May 2021 14:09:53 +0100 User-Agent: Mozilla/5.0 (X11; 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X-MS-Exchange-AntiSpam-MessageData: =?Windows-1252?Q?b6Fgut/Ug5dxiyyqtG1XB67WYTiAxc9dJ6Sv6ZSjkn7ke8yOi5ckbtbn?= =?Windows-1252?Q?yXGKXp4e/UBa3auMLHtiKfCMImSz95doECl3KFishNrD6KWK0CRNIAfI?= =?Windows-1252?Q?1v+LoolYbjpR8KVzlWCYgqP0OY0CgbxOHtxHsEHGNjlG+mWpTC/r5Rmg?= =?Windows-1252?Q?wUBzXIucNC6RRuiZE8d+Gbmcsf7xrY0XyMtnQkrIM5vdk+lCrczYhaV0?= =?Windows-1252?Q?d3Z9C/Fx8vC5bK5gXLXe2MTi+Mev+w/HrPayF1nFKRWxRePKnU1yzE5W?= =?Windows-1252?Q?BXk20AaAvrLDUuHIyUjt53zMb4vlXWjd5ToMfRWledttGH5bXoCjXi+F?= =?Windows-1252?Q?Wk02pjHa9yyGEAOssVGDCcwPJ3/BxkSDhOBtSpJVc9j7QYYcI0aBhp8y?= =?Windows-1252?Q?jChl4FmyY7dZWQ0G79kjrrkELwFLRd4iN87aiB3lbaWSys+VZu7ByQ7s?= =?Windows-1252?Q?t1Adxzr8RxCf+biNW9tZiNA48WiuhL6e4HBlg1tRU8eNSdA2jvopOyd3?= =?Windows-1252?Q?kVYzkHtpF/txGGMOsMB5s7YT3DVeUQYAawHd2fIAeRiQIzem0Xgn+lSS?= =?Windows-1252?Q?jd5vPwiPdtHRTT+qxhAXNSSZhMzBeXIK2AKd2dy+64hP7gUqKlUtPm++?= =?Windows-1252?Q?yclAfQGdurFlQNio+LzsZV9n3JpDyMYgGdf3N4kk56HX799zVuTDEzTq?= =?Windows-1252?Q?mOnqF2iwzZv7YTwPbWZtIjaee8oPkPOlY1tWBN6tMOWV1Z4kS9UOpvBS?= =?Windows-1252?Q?LFUKo1vYnSED6rcz+j1Du36AVnjbYDVh+mjtQbjC7xYwZLiHrPbJ1fbr?= =?Windows-1252?Q?4/Xo2riygTbpFdGABktNB6jvtbCKbtizHO4hbVmtLpmOMct8Klbv54aD?= =?Windows-1252?Q?Brl4a0/zJYrxw31ZtFomABc8qU/aHK4nVPVQLS5uEjS5cGnAoKJL3zmw?= =?Windows-1252?Q?rKfU2yE9o7KwMEfksrh5UcUrY6Lg6wUrqpEu3qcvMF7FUWAHlQ3hSHEO?= =?Windows-1252?Q?w61wqH+rdtAg0vzQKiP4mr8SATUdYDA1L4tskgvlqSMlaO3ilBpWvUYL?= =?Windows-1252?Q?dCM/erCi+lOgZ24p+40Tt7FjDKgDvLCAFv1RlAwYpRlKSRUuXNkS6sCy?= =?Windows-1252?Q?lkS8p/UhdfGu++uTTgyTHQpR5Vlqj8x+yWx47Y0dNTGX60s8trgsQQjd?= =?Windows-1252?Q?hUGu1aJiESuunTtL85dg9jnRsQnoiJ0GcNl7SRrKpROVQPHDPeSDv3SI?= =?Windows-1252?Q?I3oyqNem4C54LhnqaLp/8+eRQaQkxx0YaQC3lau9ts7G+aX3r24NPmsS?= =?Windows-1252?Q?Mz8caSD8XzIWSi5jquRO0ZmTMgz8iuJTgVC+JwqdAbveroCUeIUKZNRb?= =?Windows-1252?Q?0qolEAT5bIutOcf5Uip6+yLBY5a1E8AVymVtPQqEisvP29rMhc6Tzi4B?= X-MS-Exchange-CrossTenant-Network-Message-Id: 46b0ce1c-c7ac-4483-f6ad-08d9161069a7 X-MS-Exchange-CrossTenant-AuthSource: BYAPR03MB3623.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 May 2021 13:10:00.0617 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Zh9okuM/eOsZ0XwdXvXDwkBg8FWIX1HJ0ApXEPUtxqMQf5hrsXUn92wgQgvGUE9CPQde28PApP6SR4FRmUYTJq8q22IFSXK2F2fRYx9Vc6w= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR03MB6392 X-OriginatorOrg: citrix.com On 13/05/2021 14:00, Olaf Hering wrote: > Am Thu, 13 May 2021 13:29:32 +0100 > schrieb Andrew Cooper : > >> Warning: NX (Execute Disable) protection not active > There was a knob in the BIOS, it was set to "Disabled" for some reason. > Once enabled, the flag is seen and the dom0 starts fine. > > If Xen is booted with 'cpuid=no-nx', the dom0 crashes again. > > Thanks for the help, Andrew. Well - I wouldn't say we're quite done yet. Clearly between sle12sp3 and sle12sp4 you've picked up a regression where Linux decides to use NX despite its absence. If NX is a mandatory feature now, then dom0 ought to error out cleanly stating this fact. ~Andrew