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docs: Add snapshot-revert qemu managedsave force
Add documentation for additional reason why snapshot-revert might need to be forced. This explains why restoring an inactive snapshot while there is managed saved state is refused by default. Signed-off-by: Michael Weiser <michael.weiser@gmx.de> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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@ -6970,7 +6970,7 @@ no vm state leaves the domain in an inactive state. Passing either the
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transient domains cannot be inactive, it is required to use one of these
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transient domains cannot be inactive, it is required to use one of these
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flags when reverting to a disk snapshot of a transient domain.
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flags when reverting to a disk snapshot of a transient domain.
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There are two cases where a snapshot revert involves extra risk, which
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There are a number of cases where a snapshot revert involves extra risk, which
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requires the use of *--force* to proceed:
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requires the use of *--force* to proceed:
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* One is the case of a snapshot that lacks full domain information for
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* One is the case of a snapshot that lacks full domain information for
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@ -6980,7 +6980,7 @@ requires the use of *--force* to proceed:
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libvirt that the snapshot is compatible with the current configuration
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libvirt that the snapshot is compatible with the current configuration
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(and if it is not, the domain will likely fail to run).
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(and if it is not, the domain will likely fail to run).
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* The other is the case of reverting from a running domain to an active
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* Another is the case of reverting from a running domain to an active
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state where a new hypervisor has to be created rather than reusing the
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state where a new hypervisor has to be created rather than reusing the
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existing hypervisor, because it implies drawbacks such as breaking any
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existing hypervisor, because it implies drawbacks such as breaking any
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existing VNC or Spice connections; this condition happens with an active
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existing VNC or Spice connections; this condition happens with an active
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@ -6988,6 +6988,13 @@ requires the use of *--force* to proceed:
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an inactive snapshot that is combined with the *--start* or *--pause*
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an inactive snapshot that is combined with the *--start* or *--pause*
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flag.
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flag.
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* Also, libvirt will refuse to restore snapshots of inactive QEMU domains
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while there is managed saved state. This is because those snapshots do not
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contain memory state and will therefore not replace the existing memory
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state. This ends up switching a disk underneath a running system and will
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likely cause extensive filesystem corruption or crashes due to swap content
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mismatches when run.
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snapshot-delete
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snapshot-delete
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---------------
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---------------
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