[Qemu-devel] [Bug 1184089] [NEW] [Feature request] loadvm snapshot as read-only

[Michael Coppola]

Public bug reported:

There are many ways to take and manage snapshots in QEMU, but one main
feature that's missing is the ability to 'loadvm' a LIVE snapshot and
have all future changes redirected to a temporary file.  This would
effectively be combining the -loadvm and -snapshot switches and make the
snapshot read-only.  With this feature, users would be provided a
"sandbox" and be able to start and restart the same live snapshot
without corrupting the image in doing so.

I found a lot of discussion about this topic on the mailing list years
ago, including some patch submissions, but none of the conversations
panned out.

http://lists.gnu.org/archive/html/qemu-discuss/2011-10/msg00011.html
http://copilotco.com/mail-archives/qemu.2008/msg00072.html
http://web.archiveorange.com/archive/v/1XS1vcusGInZKG2e0ImX
http://marc.info/?l=qemu-devel&m=117191084713590

What would it take for this feature to be added, and can we use the
patches submitted by Eddie Kohler to enable this feature?

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1184089

Title:
  [Feature request] loadvm snapshot as read-only

Status in QEMU:
  New

Bug description:
  There are many ways to take and manage snapshots in QEMU, but one main
  feature that's missing is the ability to 'loadvm' a LIVE snapshot and
  have all future changes redirected to a temporary file.  This would
  effectively be combining the -loadvm and -snapshot switches and make
  the snapshot read-only.  With this feature, users would be provided a
  "sandbox" and be able to start and restart the same live snapshot
  without corrupting the image in doing so.

  I found a lot of discussion about this topic on the mailing list years
  ago, including some patch submissions, but none of the conversations
  panned out.

  http://lists.gnu.org/archive/html/qemu-discuss/2011-10/msg00011.html
  http://copilotco.com/mail-archives/qemu.2008/msg00072.html
  http://web.archiveorange.com/archive/v/1XS1vcusGInZKG2e0ImX
  http://marc.info/?l=qemu-devel&m=117191084713590

  What would it take for this feature to be added, and can we use the
  patches submitted by Eddie Kohler to enable this feature?

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