On Mon, May 11, 2020 at 07:37:06PM +0300, Kirill A. Shutemov wrote: > A 5-level paging capable machine can have memory above 46-bit in the > physical address space. This memory is only addressable in the 5-level > paging mode: we don't have enough virtual address space to create direct > mapping for such memory in the 4-level paging mode. > > Currently, we fail boot completely: NULL pointer dereference in > subsection_map_init(). > > Skip creating a memblock for such memory instead and notify user that > some memory is not addressable. > > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx # v4.14 > --- > > Tested with a hacked QEMU: https://gist.github.com/kiryl/d45eb54110944ff95e544972d8bdac1d BTW, I was only able to boot with legacy SeaBIOS, not with OVMF. No idea why. -- Kirill A. Shutemov
