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Revision 4e4fa398


Added by Jan Kiszka almost 9 years ago

qdev: Introduce lost tick policy property

Potentially tick-generating timer devices will gain a common property:
lock_tick_policy. It allows to encode 4 different ways how to deal with
tick events the guest did not process in time:

discard - ignore lost ticks (e.g. if the guest compensates for them
delay - replay all lost ticks in a row once the guest accepts them
merge - if multiple ticks are lost, all of them are merged into one
which is replayed once the guest accepts it again
slew - lost ticks are gradually replayed at a higher frequency than
the original tick

Not all timer device will need to support all modes. However, all need
to accept the configuration via this common property.

Signed-off-by: Jan Kiszka <>
Signed-off-by: Anthony Liguori <>


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