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[Qemu-devel] [Bug 1123975] Re: QEmu 1.3.90 cannot restore a 1.1.2 live s
From: |
Michael Tokarev |
Subject: |
[Qemu-devel] [Bug 1123975] Re: QEmu 1.3.90 cannot restore a 1.1.2 live snapshot |
Date: |
Tue, 19 Feb 2013 05:34:42 -0000 |
Ok, so this is migration from qemu-kvm 1.1 to qemu 1.3. This officially
does not work because the two uses different memory layout.
There is a way to make this work from old qemu-kvm to new qemu, by
patching new qemu, but this introduces incompatibilities in other areas.
Hopefully there will be no more "major" transitions like this in the
future (I mean from qemu-kvm to qemu), so there's a chance that
snapshots made with 1.3 and up will be forward-compatible.
While this bugreport is filed with debian versions in mind, we in debian
especially did not apply any changes to upstream qemu in this area, --
as history shows, any attempt to "fix" this "downstream" only makes
things worse.
** Summary changed:
- QEmu 1.3.90 cannot restore a 1.1.2 live snapshot
+ QEmu 1.3+ cannot restore a 1.1- live snapshot made in qemu-kvm
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https://bugs.launchpad.net/bugs/1123975
Title:
QEmu 1.3+ cannot restore a 1.1- live snapshot made in qemu-kvm
Status in QEMU:
Confirmed
Bug description:
I have upgraded to QEmu 1.3.90 (Debian 1.4.0~rc0+dfsg-1exp) but now
when I try to restore a live snapshot made in QEmu 1.1.2 (Debian
1.1.2+dfsg-5) I get the following message:
virsh # snapshot-revert fgtbbuild wtb
error: operation failed: Error -22 while loading VM state
I have test VMs with live snapshots coreresponding to different
testing configurations. So I typically revert the VMs in one of the
live snapshots and run the tests. It would be pretty annoying to have
to recreate all these live snapshots any time I upgrade QEmu.
ipxe-qemu 1.0.0+git-20120202.f6840ba-3
qemu 1.4.0~rc0+dfsg-1exp
qemu-keymaps 1.4.0~rc0+dfsg-1exp
qemu-kvm 1.4.0~rc0+dfsg-1exp
qemu-system 1.4.0~rc0+dfsg-1exp
qemu-system-arm 1.4.0~rc0+dfsg-1exp
qemu-system-common 1.4.0~rc0+dfsg-1exp
qemu-system-mips 1.4.0~rc0+dfsg-1exp
qemu-system-misc 1.4.0~rc0+dfsg-1exp
qemu-system-ppc 1.4.0~rc0+dfsg-1exp
qemu-system-sparc 1.4.0~rc0+dfsg-1exp
qemu-system-x86 1.4.0~rc0+dfsg-1exp
qemu-user 1.4.0~rc0+dfsg-1exp
qemu-utils 1.4.0~rc0+dfsg-1exp
libvirt-bin 1.0.2-1
libvirt-dev 1.0.2-1
libvirt-doc 1.0.2-1
libvirt-glib-1.0-0 0.1.2-1
libvirt0 1.0.2-1
libvirtodbc0 6.1.4+dfsg1-5
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