linux-kernel - Re: [PATCH v2] x86/boot: Use efi_setup_data for searching RSDP on kexec-ed kernel

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Date:   Thu, 4 Apr 2019 01:23:26 +0000
From:   Junichi Nomura <j-nomura@...jp.nec.com>
To:     Chao Fan <fanc.fnst@...fujitsu.com>, Dave Young <dyoung@...hat.com>
CC:     Borislav Petkov <bp@...en8.de>, "bhe@...hat.com" <bhe@...hat.com>,
        "kasong@...hat.com" <kasong@...hat.com>,
        "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 for searching RSDP on
 kexec-ed kernel

Hi Dave and Chao,

On 4/3/19 6:02 PM, Chao Fan wrote:
> On Wed, Apr 03, 2019 at 04:23:06PM +0800, Chao Fan wrote:
>> On Wed, Apr 03, 2019 at 04:09:16PM +0800, Dave Young wrote:
>>> Fix 3.  need more debugging, have you or Junichi run tests on more real
>>> hardware, maybe it is easier to reproduce on real hardware, I'm glad to
>>> help to try test patch or provide any help. 
>>
>> I am still testing in real hardware.
> 
> Hi Dave,
> 
> I find a Fujitsu Desktop PC to test it.
> Without this PATCH, it failed to kexec and kdump.
> With this PATCH, it succeed to kexec.
> But failed to kdump. From the log, I think it didn't jump to the second
> kernel, just reboot after panic. I have not figured out what's the
> problem, but it seems not caused by this PATCH.
> So I still think this PATCH works for the Fujitsu Desktop PC.
> 
> As for your issue, I think there may be some problems related to specified
> hardware. Are you using a Lenovo laptop?
> 
> And I am not sure how Nomura tested it.

I've tested 3 different models of EFI-booted baremetal servers with both
normal kexec and panic kexec.  So far as I've tried Linus's v5.1-rc3,
the problem always reproduced without the patch and disappears with the patch.

-- 
Jun'ichi Nomura, NEC Corporation / NEC Solution Innovators, Ltd.