On 04.01.21 16:33, Michal Hocko wrote: > On Mon 04-01-21 16:15:23, David Hildenbrand wrote: >> On 04.01.21 16:10, Michal Hocko wrote: > [...] >> Do the physical addresses you see fall into the same section as boot >> memory? Or what's around these addresses? > > Yes I am getting a garbage for the first struct page belonging to the > pmem section [1] > [ 0.020161] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x603fffffff] > [ 0.020163] ACPI: SRAT: Node 4 PXM 4 [mem 0x6060000000-0x11d5fffffff] non-volatile > > The pfn without the initialized struct page is 0x6060000. This is a > first pfn in a section. Okay, so we're not dealing with the "early section" mess I described, different story. Due to [1], is_mem_section_removable() called pfn_to_page(PHYS_PFN(0x6060000)). page_zone(page) made it crash, as not initialized. Let's assume this is indeed a reserved pfn in the altmap. What's the actual address of the memmap? I do wonder what hosts pfn_to_page(PHYS_PFN(0x6060000)) - is it actually part of the actual altmap (i.e. > 0x6060000) or maybe even self-hosted? If it's not self-hosted, initializing the relevant memmaps should work just fine I guess. Otherwise things get more complicated. -- Thanks, David / dhildenb
