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

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Message-ID: <20140605150159.GA14083@redhat.com>
Date:	Thu, 5 Jun 2014 11:01:59 -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 Thu, Jun 05, 2014 at 04:31:34PM +0800, Dave Young wrote:

[..]
> > +	ret = kexec_file_load(kernel_fd, info.initrd_fd, info.command_line,
> > +			info.command_line_len, info.kexec_flags);
> 
> Vivek,
> 
> I tried your patch on my uefi test machine, but kexec load fails like below:
> 
> [root@...alhost ~]# kexec -l /boot/vmlinuz-3.15.0-rc8+ --use-kexec2-syscall
> Could not find a free area of memory of 0xa000 bytes ...

Hi Dave,

I think this message is coming from kexec-tools from old loading path. I
think somehow new path did not even kick in. I tried above and I got
-EBADF as I did not pass initrd. Can you run gdb on kexec and see if
you are getting to syscall or run strace.

> 
> Another issue is that the syscall should allow load kernel only without initrd

Agreed. Currently my code is not handling it. I am thinking of ways how to
make passing initrd fd optional.

> 
> and
> cmdline since kernel can mount root and embed cmdline in itself.

Passing command line is already optional. I tried it and kexec loaded
successfully.

Thanks
Vivek
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