linux-kernel - Re: [RFC PATCH 00/13][V3] kexec: A new system call to allow in kernel loading

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Date:	Wed, 18 Jun 2014 08:40:37 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Dave Young <dyoung@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
	ebiederm@...ssion.com, hpa@...or.com, mjg59@...f.ucam.org,
	greg@...ah.com, bp@...en8.de, jkosina@...e.cz, chaowang@...hat.com,
	bhe@...hat.com, akpm@...ux-foundation.org
Subject: Re: [RFC PATCH 00/13][V3] kexec: A new system call to allow in
 kernel loading

On Wed, Jun 18, 2014 at 09:52:46AM +0800, Dave Young wrote:
[..]
> > > > Hi, Vivek
> > > > 
> > > > For efi ioremapping case, in 3.15 kernel efi runtime maps will not be saved
> > > > if efi=old_map is used. So you need detect this and fail the kexec file load.
> > > 
> > > Dave,
> > > 
> > > Instead of failing kexec load in case of efi=old_map, I think it will be
> > > better to just not pass runtime map in bootparams. That way user can
> > > pass "noefi" on commandline and kdump should still work.  (Like it works
> > > with user space implementation).
> 
> BTW, in kexec-tools in case old_map it just does not fill efi_info so 2nd kernel
> will automaticlly switch to noefi boot. So do same in kernel make sense as well.

Yep. If old_map is being used, I will not fill efi_info and I will also
not pass efi setup data structure. I think user space does the same.

> 
> In userspace tools we pass acpi_rsdp for kdump noefi case, do you want to add that
> in the kernel loader?

I will not do that in kernel. I will expect user space to pass in
acpi_rsdp=0x on command line.

Thanks
Vivek
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