On Tue, 3 Dec 2019 at 20:14, Masayoshi Mizuma <msys.mizuma@xxxxxxxxx> wrote: > > From: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx> > > kexec reboot sometime fails in early boot sequence on aarch64 machine. > That is because kexec overwrites the LPI property tables and pending > tables with the initrd. > > To avoid the overwrite, introduce /proc/efi/memreserve to tell the > tables region to kexec so that kexec can avoid the memory region to > locate initrd. > > kexec also needs a patch to handle /proc/efi/memreserve. I'm preparing > the patch for kexec. > > Changelog > v2: - Change memreserve file location from sysfs to procfs. > memreserve may exceed the PAGE_SIZE in case efi_memreserve_root > has a lot of entries. So we cannot use sysfs_kf_seq_show(). > Use seq_printf() in procfs instead. > > Masayoshi Mizuma (2): > efi: add /proc/efi directory > efi: arm64: Introduce /proc/efi/memreserve to tell the persistent > pages > Apologies for the tardy response. Adding /proc/efi is really out of the question. *If* we add any special files to expose this information, it should be under sysfs. However, this is still only a partial solution, since it only solves the problem for userspace based kexec, and we need something for kexec_file_load() as well. The fundamental issue here is that /proc/iomem apparently lacks the entries that describe these regions as 'reserved', so we should try to address that instead. _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
