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=?utf-8?B?Zk5aVisxR09KeFJXdlUyTTdZdjBJbzlnK3Exdkl2RlhxdVNtbDF3UEt0dWto?= =?utf-8?B?bVRuQzQybmZWMmFQc1Z2YjAvcU4yOUFuSjc3L1kxSDZaWkY2bWZ4Y0hXK2Vw?= =?utf-8?B?U3FkU3dKRC9ETFNBejZ2SUNIQmpMSmVJN1Z6eTd1MElyQ0xtOU1QMnVZYkpV?= =?utf-8?B?QlVvaHdxd1pYaERYdnk3VHNKY2M2V2FYQjFFVEFETEtvMzdER2xXNys2bnRF?= =?utf-8?B?N1lLdDhHcEhrWXo2ZVQzczY4OWRwYzlSek83aCthN29BNHBUWlozNEJxS0k2?= =?utf-8?Q?ByGZ5VlF2plQOA7fPRMPOMWe9ieGDHRE=3D?= X-OriginatorOrg: citrix.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2b74698a-6acc-41f3-b920-08db98017cfd X-MS-Exchange-CrossTenant-AuthSource: BYAPR03MB3623.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Aug 2023 11:20:36.5881 (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: OfqkX42nsBURajwXAgAIya8WL0RrrU86q0UiMdU4bj1CCLeyKPHd1faBY6nl1ljqiYAC3E4WpT4ab1AGkjjYt83jFnxMziTHI0nftkyJ0DI= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY1PR03MB7261 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/08/2023 8:40 am, Juergen Gross wrote: > Tested on an Intel system with Xen: > > - PV dom0 is working fine. I couldn't test physical cpu hotplug, but > removing >   and then re-adding vcpus to dom0 worked. It turns out that physical CPU hotplug with XenPV is broken in at least two ways. It's dom0 (not Xen) that gets the hot-unplug event, after which the Xen code in Linux succumbs to a preempt-check failure while trying to offline the vCPU that aliases the pCPU wanting to go offline. ~Andrew