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Re: [libvirt] [PATCH] snapshot: ABI stability must include memory sizing



On 09/14/2011 09:47 AM, Michal Privoznik wrote:
On 13.09.2011 22:27, Eric Blake wrote:
Commit 973fcd8f introduced the ability for qemu to reject snapshot
reversion on an ABI incompatibility; but the very example that was
first proposed on-list[1] as a demonstration of an ABI incompatibility,
namely that of changing the max memory allocation, was not being
checked for, resulting in a cryptic failure when running with larger
max mem than what the snapshot was created with:
error: operation failed: Error -22 while loading VM state

This commit merely protects the three variables within mem that are
referenced by qemu_command.c, rather than all 7 (the other 4 variables
affect cgroup handling, but have no visible effect to the qemu guest).

[1] https://www.redhat.com/archives/libvir-list/2010-December/msg00331.html

* src/conf/domain_conf.c (virDomainDefCheckABIStability): Add
memory sizing checks.
---

See also https://bugzilla.redhat.com/show_bug.cgi?id=735553#c5


ACK

Thanks; pushed.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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