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

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Message-ID: <51D9A7D1-49BF-4679-B102-0FC5AC300C9F@alien8.de>
Date:   Mon, 25 Mar 2019 09:54:19 +0100
From:   Boris Petkov <bp@...en8.de>
To:     Junichi Nomura <j-nomura@...jp.nec.com>,
        Dave Young <dyoung@...hat.com>,
        "fanc.fnst@...fujitsu.com" <fanc.fnst@...fujitsu.com>,
        "bp@...e.de" <bp@...e.de>, "bhe@...hat.com" <bhe@...hat.com>,
        "kasong@...hat.com" <kasong@...hat.com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] x86/boot: Use EFI setup data if provided

On March 25, 2019 9:27:21 AM GMT+01:00, Junichi Nomura <j-nomura@...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.
-- 
Sent from a small device: formatting sux and brevity is inevitable.