On 03/22/2015 08:23 PM, Nerijus Baliunas wrote:
On Thu, 12 Mar 2015 14:56:08 -0400 Laine Stump <laine@xxxxxxxxx> wrote:
Here is the info straight from the author (I've also Cc'ed him to this
mail):
===============
The AHCI migration series is here:
http://lists.gnu.org/archive/html/qemu-devel/2015-02/msg05200.html
These are all just tests, at any rate -- the actual patch that enables
the migration is small and trivial and can be applied directly to
current upstream:
http://lists.gnu.org/archive/html/qemu-devel/2015-02/msg05202.html
All of the requisites that make AHCI safe to migrate are already
upstream now.
===========
As I understand it, all except the last patch will be in qemu 2.3. Also,
he is actively soliciting people to test it, so if you've been wanting
to learn how to build qemu from source, now is your opportunity to
figure it out!
Are the needed patches in 2.3.0-rc0?
Is it possible to backport AHCI migration to RHEL 7.1 qemu or will it be too much work?
Regards,
Nerijus
The patches that improve the stability of AHCI migration are in 2.3-rc0.
We still have not /enabled/ migration upstream, but editing to code to
allow it is fairly trivial -- it's just a true/false value in the code.
My words of caution:
(1) We still have some bugs in the AHCI device which may necessitate
changing the migration format of the device. Since we have not
officially enabled migration, these format changes may leave you unable
to migrate to later versions, because we are not currently being careful
to maintain backwards compatibility with this "unreleased" device.
[If you are wondering what the probability of being unable to migrate to
an official build where AHCI migration is supported is: Nearly 100%.]
(2) Because we have not enabled migration of AHCI officially, [And this
is not enabled or supported in RHEL!] you may run into bugs. I wouldn't
do this on a production system.
That said, if you do want to try it out on non-essential systems; for
testing, development &c: I'd appreciate any bug reports.
See http://lists.gnu.org/archive/html/qemu-devel/2015-02/msg05202.html
as mentioned above for the patch that simply enables migration.
--js
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