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Re: [Qemu-devel] vm state save/restore question
From: |
Juan Quintela |
Subject: |
Re: [Qemu-devel] vm state save/restore question |
Date: |
Wed, 20 Jun 2012 01:11:57 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.0.97 (gnu/linux) |
Benjamin Herrenschmidt <address@hidden> wrote:
> On Wed, 2012-06-20 at 00:55 +0200, Juan Quintela wrote:
>>
>> This was going to be my question.
>>
>> If we can do something like: send hash register, and get a bitmap of
>> the
>> ones that get changed, we should be good. Perhaps we need something
>> "interesting" like removing old entries (no clue if they got just
>> overwritten, or how they are replaced), and we should be good.
>
> Right, we can do an initial "snapshot" and have the kernel start
> tracking changes from there. On the final step, we can then request from
> the kernel a new snapshot with a dirty bitmap.
>
> Or we can be even simpler, just do two snapshots and have qemu diff them
> itself :-)
>
> I am confident I can come up with something as far as the kernel and
> qemu <-> kernel interface goes. I need to get my head around the details
> on how to implement that two stage save process in qemu though and the
> corresponding restore which will need to read both snapshots and apply
> the diff before shooting it back to the kernel.
>
> BTW. Does migration in pure qemu (full system emu) works similarily, ie,
> two stage ? If it does I can easily prototype everything there.
It does, but I have no clue how the hashed page tables are implemented
on ppc, i.e. if there is anything specific for bare metal. Alex?
Later, Juan.
- Re: [Qemu-devel] vm state save/restore question, (continued)
- Re: [Qemu-devel] vm state save/restore question, Andreas Färber, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Alexander Graf, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Alexander Graf, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Alexander Graf, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Juan Quintela, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question,
Juan Quintela <=
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Alexander Graf, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Benjamin Herrenschmidt, 2012/06/19
- Re: [Qemu-devel] vm state save/restore question, Alexander Graf, 2012/06/19