On Thu, Oct 25, 2018 at 12:33:45PM +0200, Borislav Petkov wrote: > On Mon, Oct 22, 2018 at 11:42:05AM -0400, Masayoshi Mizuma wrote: > > I'm trying to store the SRAT info and pass it to kernel_randomize_memory(), > > looks like add_e820ext()/parse_setup_data(). > > > > Is the approach useful only EFI environment? I'm not sure how I > > Does it matter for non-EFI even? > > I mean, you want this code only for your use case - when you have > movable memory and you're doing kexec, yes? > > And those machines are all EFI boxes I'd assume... My actual use case is for EFI boxes, however, I think it's better to useful for legacy BIOS as well because memory hot-plug affinity in SRAT and KASLR are available on legacy BIOS. Actually, we can create such environment in qemu. I have another idea to solve this issue. Adding a SRAT parsing code to arch/x86/mm/kaslr.c. It is useful for both EFI and BIOS and also we don't need a new kernel parameter... Dose the idea make sense? Thanks, Masa
