linux-kernel - Re: [Xen-devel] is kexec on Xen domU possible?

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Message-ID: <87ob9so0sa.fsf@xmission.com>
Date:	Wed, 24 Jul 2013 00:49:25 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Matt Wilson <msw@...zon.com>, "H. Peter Anvin" <hpa@...or.com>,
	xen-devel@...ts.xensource.com,
	Daniel Kiper <daniel.kiper@...cle.com>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Brandon Philips <brandon@...p.org>
Subject: Re: [Xen-devel] is kexec on Xen domU possible?

Greg KH <gregkh@...uxfoundation.org> writes:

> On Tue, Jul 23, 2013 at 05:22:36PM -0700, Matt Wilson wrote:
>> On Mon, Jul 22, 2013 at 11:33:15AM -0700, Greg KH wrote:
>> > On Mon, Jul 22, 2013 at 11:24:46AM -0700, H. Peter Anvin wrote:
>> > > On 07/22/2013 10:20 AM, Eric W. Biederman wrote:
>> 
>> Many Xen-based cloud providers provide a mechanism for users to boot
>> the kernels they want. For example you can use PV-GRUB on EC2
>> instances to boot a kernel that is stored within an AMI.
>> 
>> For more info:
>>   http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/UserProvidedkernels.html
>
> Yes, that's quite true, but some don't, or they make it difficult to do
> so.  Using kexec also allows you to "be the bootloader" and decide on
> _which_ kernel you want to boot, independant of what cloud provider you
> use, something that lots of people want in their quest to not dependant
> on any one company.

I would be more than happy to review and help get something merged that
sorts out kexec on Xen.

Eric

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