Re: [PATCH v2] x86/boot: Use EFI setup data if provided

From: Dave Young
Date: Tue Mar 26 2019 - 08:46:21 EST

On 03/25/19 at 11:10pm, Junichi Nomura wrote:
> On 3/25/19 9:32 PM, Borislav Petkov wrote:
> > On Mon, Mar 25, 2019 at 08:23:02PM +0800, Dave Young wrote:
> >> Kexec saved the original physical addresses, and pass them to kexeced
> >> kernel via x86 setup_data, so both the early parsing or efi init code
> >> need to get those physical values from setup_data.
> >
> > So efi_get_rsdp_addr() needs to be refactored in such a way so that at
> > least the loop towards the end gets carved out into a separate function
> > - __efi_get_rsdp_addr() or so - which gets config_tables, nr_tables and
> > size as arguments and finds the RSDP address in the kexec-ed kernel.
> Since we still need to read systab for nr_tables and do signature
> check to determine if it's 32bit or 64bit for kexec-ed kernel,
> everything except the address of config_tables are common between
> normal boot and kexec boot.

Hmm, the efi/kexec support only added for 64bit, so no need check 32bit for