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From: Richard Weinberger <richard@nod.at>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: keir@xen.org, Kees Cook <keescook@chromium.org>,
	Richard Weinberger <richard.weinberger@gmail.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	kexec@lists.infradead.org, LKML <linux-kernel@vger.kernel.org>,
	xen-devel@lists.xen.org, hbabu@us.ibm.com,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	jbeulich@suse.com, "H. Peter Anvin" <hpa@linux.intel.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	david.vrabel@citrix.com
Subject: Re: kexec: Clearing registers just before jumping into purgatory
Date: Fri, 11 Oct 2013 18:47:19 +0200	[thread overview]
Message-ID: <52582B97.2060907@nod.at> (raw)
In-Reply-To: <20131011164400.GA32133@srcf.ucam.org>

Am 11.10.2013 18:44, schrieb Matthew Garrett:
> On Fri, Oct 11, 2013 at 06:42:36PM +0200, Richard Weinberger wrote:
>> On Fri, Oct 11, 2013 at 6:39 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>>> On Fri, Oct 11, 2013 at 06:33:23PM +0200, Richard Weinberger wrote:
>>>> On Fri, Oct 11, 2013 at 5:48 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>>>>> On Fri, Oct 11, 2013 at 11:44:50AM -0400, Vivek Goyal wrote:
>>>>>
>>>>>> Just Curious. How is it useful. IOW, what's your use case of booting a new
>>>>>> kernel and then jumping back.
>>>>>
>>>>> I'm kexecing into a kernel with a modified /dev/mem, modifying the
>>>>> original kernel and then jumping back into it.
>>>>
>>>> How do you update the original kernel?
>>>
>>> It's still in RAM, so the same way you'd modify any other arbitrary
>>> physical address?
>>
>> So, you have a tool like ksplice which patches the kernel in RAM?
> 
> I have /dev/mem and a list of addresses I want to modify.

But you still need a magic tool which create you this list.
If you have a tool which takes two kernel images and create such
a delta, fine.
I'm interested in that tool. :-)

Thanks,
//richard


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WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Richard Weinberger <richard.weinberger@gmail.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	Daniel Kiper <daniel.kiper@oracle.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	hbabu@us.ibm.com, "H. Peter Anvin" <hpa@linux.intel.com>,
	Kees Cook <keescook@chromium.org>,
	kexec@lists.infradead.org, LKML <linux-kernel@vger.kernel.org>,
	david.vrabel@citrix.com, jbeulich@suse.com, keir@xen.org,
	xen-devel@lists.xen.org
Subject: Re: kexec: Clearing registers just before jumping into purgatory
Date: Fri, 11 Oct 2013 18:47:19 +0200	[thread overview]
Message-ID: <52582B97.2060907@nod.at> (raw)
In-Reply-To: <20131011164400.GA32133@srcf.ucam.org>

Am 11.10.2013 18:44, schrieb Matthew Garrett:
> On Fri, Oct 11, 2013 at 06:42:36PM +0200, Richard Weinberger wrote:
>> On Fri, Oct 11, 2013 at 6:39 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>>> On Fri, Oct 11, 2013 at 06:33:23PM +0200, Richard Weinberger wrote:
>>>> On Fri, Oct 11, 2013 at 5:48 PM, Matthew Garrett <mjg59@srcf.ucam.org> wrote:
>>>>> On Fri, Oct 11, 2013 at 11:44:50AM -0400, Vivek Goyal wrote:
>>>>>
>>>>>> Just Curious. How is it useful. IOW, what's your use case of booting a new
>>>>>> kernel and then jumping back.
>>>>>
>>>>> I'm kexecing into a kernel with a modified /dev/mem, modifying the
>>>>> original kernel and then jumping back into it.
>>>>
>>>> How do you update the original kernel?
>>>
>>> It's still in RAM, so the same way you'd modify any other arbitrary
>>> physical address?
>>
>> So, you have a tool like ksplice which patches the kernel in RAM?
> 
> I have /dev/mem and a list of addresses I want to modify.

But you still need a magic tool which create you this list.
If you have a tool which takes two kernel images and create such
a delta, fine.
I'm interested in that tool. :-)

Thanks,
//richard


  parent reply	other threads:[~2013-10-11 16:47 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-11  9:28 kexec: Clearing registers just before jumping into purgatory Daniel Kiper
2013-10-11  9:28 ` Daniel Kiper
2013-10-11 10:08 ` Eric W. Biederman
2013-10-11 10:08   ` Eric W. Biederman
2013-10-11 11:04   ` Daniel Kiper
2013-10-11 11:04     ` Daniel Kiper
2013-10-11 12:52     ` Vivek Goyal
2013-10-11 12:52       ` Vivek Goyal
2013-10-11 15:37       ` Matthew Garrett
2013-10-11 15:37       ` Matthew Garrett
2013-10-11 15:37         ` Matthew Garrett
2013-10-11 15:44         ` Vivek Goyal
2013-10-11 15:44         ` Vivek Goyal
2013-10-11 15:44           ` Vivek Goyal
2013-10-11 15:48           ` Matthew Garrett
2013-10-11 15:48           ` Matthew Garrett
2013-10-11 15:48             ` Matthew Garrett
2013-10-11 16:33             ` Richard Weinberger
2013-10-11 16:33               ` Richard Weinberger
2013-10-11 16:39               ` Matthew Garrett
2013-10-11 16:39                 ` Matthew Garrett
2013-10-11 16:42                 ` Richard Weinberger
2013-10-11 16:42                   ` Richard Weinberger
2013-10-11 16:44                   ` Matthew Garrett
2013-10-11 16:44                     ` Matthew Garrett
2013-10-11 16:47                     ` Richard Weinberger
2013-10-11 16:47                     ` Richard Weinberger [this message]
2013-10-11 16:47                       ` Richard Weinberger
2013-10-11 16:55                       ` Matthew Garrett
2013-10-11 16:55                       ` Matthew Garrett
2013-10-11 16:55                         ` Matthew Garrett
2013-10-11 16:59                         ` Richard Weinberger
2013-10-11 16:59                         ` Richard Weinberger
2013-10-11 16:59                           ` Richard Weinberger
2013-10-11 17:01                           ` Matthew Garrett
2013-10-11 17:01                           ` Matthew Garrett
2013-10-11 17:01                             ` Matthew Garrett
2013-10-11 20:44                             ` Eric W. Biederman
2013-10-11 20:44                               ` Eric W. Biederman
2013-10-11 20:50                               ` Matthew Garrett
2013-10-11 20:50                                 ` Matthew Garrett
2013-10-11 20:50                               ` Matthew Garrett
2013-10-11 20:44                             ` Eric W. Biederman
2013-10-11 16:53                     ` Vivek Goyal
2013-10-11 16:53                       ` Vivek Goyal
2013-10-11 16:56                       ` Matthew Garrett
2013-10-11 16:56                         ` Matthew Garrett
2013-10-11 16:56                       ` Matthew Garrett
2013-10-11 16:53                     ` Vivek Goyal
2013-10-11 16:44                   ` Matthew Garrett
2013-10-11 16:42                 ` Richard Weinberger
2013-10-11 16:39               ` Matthew Garrett
2013-10-11 16:33             ` Richard Weinberger
2013-10-11 12:52     ` Vivek Goyal
2013-10-11 22:15     ` Eric W. Biederman
2013-10-11 22:15     ` Eric W. Biederman
2013-10-11 22:15       ` Eric W. Biederman
2013-10-14 18:24       ` Daniel Kiper
2013-10-14 18:24         ` Daniel Kiper
2013-10-14 18:24       ` Daniel Kiper
2013-10-11 11:04   ` Daniel Kiper
2013-10-11 10:08 ` Eric W. Biederman
  -- strict thread matches above, loose matches on Subject: below --
2013-10-11  9:28 Daniel Kiper

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