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

Dave Young dyoung at redhat.com
Mon Mar 25 03:15:09 PDT 2019

On 03/25/19 at 09:54am, Boris Petkov wrote:
> On March 25, 2019 9:27:21 AM GMT+01:00, Junichi Nomura <j-nomura at ce.jp.nec.com> wrote:
> >On 3/25/19 3:59 PM, Dave Young wrote:
> >> On 03/25/19 at 06:47am, Junichi Nomura wrote:
> >>> On 3/25/19 3:19 PM, Dave Young wrote:
> >>>> On 03/25/19 at 02:01pm, Dave Young wrote:
> >>>> I think normally people do not see this bug, because kernel will
> >set the
> >>>> rsdp in boot_params->acpi_rsdp_addr.  Maybe you are testing with
> >>>
> >>> I think it's only done for file-based kexec interface.
> >> 
> >> Saw Kairui's another reply, yes, kexec-tools need a patch to fill the
> >> value as well then.
> >> 
> >> I would vote for a repost of your old patch with some #ifdef
> >
> >Thanks for comments, Dave, Kairui and Baoquan.
> >
> >The problem for me is it's a regression in v5.1-rc1, that breaks
> >existing setup. If early parsing of RSDP is required only for newly
> >supported configuration, I'm fine such configuration requires
> >new tools or new options.
> >
> >This is the 1st version plus #ifdef around the EFI code.
> I'm going to repeat that again until you get it:
> If the kexec kernel should continue to use efi_systab_init() then you
> should make efi_get_rsdp_addr() exit early in the kexec-ed kernel.

In that way, early parsing will fail in kexeced kernel, am I missing
something?  The early code become complicated but since we have already
the early acpi parsing why not to make it consistent in kexeced kernel?


More information about the kexec mailing list