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

[Dave Young]

On 04/04/19 at 01:23am, Junichi Nomura wrote:
> 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.

Hmm, both of my two laptops (Thinkpad T480s and T420) failed to boot with kexec.

I will see if I can find something, but it may need more time because
early console does not work especially after kexec.

Thanks
Dave