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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?xpM67I6jhU6+l54X1swJpGwuXIbw2iH+d842JRNrlFJWbATyFn7YS1gf3BD9?= =?us-ascii?Q?5JsgQMb4f2uQz7rtZNfZMiHYmACft5JpyVVDrafwc6OeO+7KGIQzC3PWROUb?= =?us-ascii?Q?eO7AyOmAg50YElMPTKkuZOX0FOHwhZjaniIw2uBkuKeHE03yGGr9iuKGUsz8?= =?us-ascii?Q?Po6U8/Tq1j46PZQ74KXccqb1Up3y/DncqdeKGQpr2MeBMmgPg/WVZCdLgaeP?= =?us-ascii?Q?SF2PrPwuha2Nxo6J3dpVszcDGwIhXN9Wh5azt8NWeDlxfI5nIZKqG2adyBsQ?= =?us-ascii?Q?23GABTFjVHpfbrMhyOsjjAwYqz74EVUpLXWduLinSfj1xD31f24HvvlekxmT?= =?us-ascii?Q?jN7A8FsRFnMLoR1xPppw0mqE88KshaDURrn72qg332xQOV+exVd3PKqPE1dX?= =?us-ascii?Q?ayQ0EvC4meyQnr4F0Ivf+e35D5wbtUlj/pAgjPShw/ulcCkhet8Y70qY3nID?= =?us-ascii?Q?gABknQqQtqrle3vXwf0vrcWR7y/xf/i2jYU5HbtgvaGjVNC1OFrjiMFO5aTK?= =?us-ascii?Q?CqO+JivRsa3Fb6rgtTJsGBBgBtPdXakEnmdwYVukuibO2UEAsw0LkFyO6xVV?= =?us-ascii?Q?NIiw7nMjdTOSlKnjqw7E7rcseigJ3EC3osAod7bLhI3B+9InF125BidilpZP?= =?us-ascii?Q?VQgN0EF9bfKHSxhCvhQxDPYr1sdmW7jNodJd5irFNX555jTh4WnIxA8bSmZk?= =?us-ascii?Q?3qnv+K0dxp956TsRKUobyZbTdqx+cIWC6GUN06P93fRUrj5xix/5E7BuowZI?= =?us-ascii?Q?Sl3NMGas78rEA20MVPGffIV3YsydAEcPVNuxHxMP0UfpK8cGgS5qiMF7RipH?= =?us-ascii?Q?IDz1MRgA9uqIUKPZ1PgBQf/Lktz9ElBrFysRtUSMd+BtCjRLC6QaIt+sXgrt?= =?us-ascii?Q?ZWpQ0EpdTXPXcYJIdabDiV+Gg1ZQvf8dT96N3UgBGGD5RG7p9nMIdLyy/286?= =?us-ascii?Q?pmZFUAacgjLcBJzDuRkJzOzWsaRFwvKjhx0v9DbZrbinlbWWz38u1e8CMlnN?= =?us-ascii?Q?aQ7mCQwPC3cw1kaL1VmKS5PkD9tkkiL1swzv9uwf/m6Zr98ds1YUqt8m1KmO?= =?us-ascii?Q?nftNDxM+6DhjJJb1SE2MFmz54dGkB1oG3zxbQEDknXkl2m+RGgdxLscpUSZw?= =?us-ascii?Q?PYutFORfixhA9Ii/A/fdg3a9OTalrGLB6altpHn1FSqorAb9H7udmWBmeKAa?= =?us-ascii?Q?kVIIn2SgMGqM4DAZctMcJAjBnj4GzqeySageV3D/6om88zMEzkG+bDTcgOTp?= =?us-ascii?Q?LfFFYmwdgr+9fOKgNcdcZ8gLXNbICVoqV70a34q6N7XnZytVHvDxtgRfoHXz?= =?us-ascii?Q?aXyGE/OaxJAO7xT7DoM6B6vO?= X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: d575d683-bf97-4287-8921-08d979a69034 X-MS-Exchange-CrossTenant-AuthSource: VI1PR04MB5600.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Sep 2021 06:44:14.1859 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: jExuV+Tc9aQuuKJAy2PQTmIuQEkIIf8PQ+GzJh8wSxGZl4RlIBNEbhHlUfHOw7TSeiEOK0TdvRxSvqwkN7GURw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB4848 On 16.09.2021 22:16, Stefano Stabellini wrote: > On Thu, 16 Sep 2021, Jan Beulich wrote: >> On 16.09.2021 17:07, Luca Fancellu wrote: >>> I explain here my understanding on dom0less, this feature is used to st= art domUs at >>> Xen boot in parallel, the name is misleading but it doesn=E2=80=99t req= uire dom0 to be absent. >>> >>> So if you have a dom0 kernel embed in the image, it's completely fine t= o start it and it=20 >>> doesn=E2=80=99t have to be skipped. >>> >>> Here the possible user cases: >>> 1) start only dom0 [dom0 modules on xen.cfg or embedded in Xen image] >>> 2) start only domUs, true dom0less [no dom0 modules on xen.cfg or embed= ded in Xen image, domUs on DT] >>> 3) start dom0 and domUs [(dom0 modules on xen.cfg or embedded in Xen im= age) and domUs on DT] >> >> If that's the intention - fine. Stefano? >=20 > What do you mean by dom0 modules embedded in the Xen image? I am not > familiar with it, but I imagine it doesn't involve any multiboot,module > nodes in device tree, right? There's no DT interaction there afaict. See commit 8a71d50ed40b ("efi: Enable booting unified hypervisor/kernel/initrd images"). > Putting aside "dom0 modules embedded in Xen image" that I didn't fully > understand, there are three ways to load Dom0: >=20 > - dom0 kernel (and ramdisk, optional) on xen.cfg > - dom0 kernel (and ramdisk, optional) on device tree using the "reg" prop= erty > - dom0 kernel (and ramdisk, optional) on device tree using the "uefi,bina= ry" property >=20 > Then, the other use cases are: >=20 > - true dom0less, domUs on device tree using the "reg" property > - true dom0less, domUs on device tree using the "uefi,binary" property >=20 > And of course all the possible combinations between Dom0 and DomU > loading. Okay, so as Luca says "dom0less" is a misnomer really. I wasn't aware of this. Jan