Hi! On 16/05/2019 17:48, Hsin-Yi Wang wrote: > On Thu, May 16, 2019 at 11:32 PM Rob Herring <robh+dt@xxxxxxxxxx> wrote: >> Doesn't kexec operate on a copy because it already does modifications. It does! > This patch is to assist "[PATCH v3 3/3] fdt: add support for rng-seed" > (https://lkml.org/lkml/2019/5/16/257). I thought that by default > second kernel would use original fdt, so I write new seed back to > original fdt. Might be wrong. > > ** "[PATCH v3 3/3] fdt: add support for rng-seed" is supposed to > handle for adding new seed in kexec case, discussed in v2 > (https://lkml.org/lkml/2019/5/13/425) > > By default (not considering user defines their own fdt), if second > kernel uses copied fdt, when is it copied and can we modify that? Regular kexec's user-space already updates the dtb for the cmdline and maybe the initrd. For KASLR, it generates its own seed with getrandom(): https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git/tree/kexec/arch/arm64/kexec-arm64.c#n483 If user-space can do it, user-space should do it! Thanks, James
