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| author | Philippe Mathieu-Daudé <philmd@redhat.com> | 2020-09-13 21:53:41 +0200 |
|---|---|---|
| committer | Markus Armbruster <armbru@redhat.com> | 2020-09-29 15:41:35 +0200 |
| commit | 8dc007d3d9f79d0c60c750055a79ce8b21bfb494 (patch) | |
| tree | 6976d1dfce41d752ad2acb408517f77dd39fbe5d /qapi/machine.json | |
| parent | b150cb8f67bf491a49a1cb1c7da151eeacbdbcc9 (diff) | |
| download | qemu-8dc007d3d9f79d0c60c750055a79ce8b21bfb494.zip | |
qapi: Restrict LostTickPolicy enum to machine code
Restricting LostTickPolicy to machine.json pulls slightly less
QAPI-generated code into user-mode.
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200913195348.1064154-2-philmd@redhat.com>
[Add rationale to commit message]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Diffstat (limited to 'qapi/machine.json')
| -rw-r--r-- | qapi/machine.json | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/qapi/machine.json b/qapi/machine.json index d8ed096e9a..8e2164a0b6 100644 --- a/qapi/machine.json +++ b/qapi/machine.json @@ -403,6 +403,38 @@ { 'command': 'query-target', 'returns': 'TargetInfo' } ## +# @LostTickPolicy: +# +# Policy for handling lost ticks in timer devices. Ticks end up getting +# lost when, for example, the guest is paused. +# +# @discard: throw away the missed ticks and continue with future injection +# normally. The guest OS will see the timer jump ahead by a +# potentially quite significant amount all at once, as if the +# intervening chunk of time had simply not existed; needless to +# say, such a sudden jump can easily confuse a guest OS which is +# not specifically prepared to deal with it. Assuming the guest +# OS can deal correctly with the time jump, the time in the guest +# and in the host should now match. +# +# @delay: continue to deliver ticks at the normal rate. The guest OS will +# not notice anything is amiss, as from its point of view time will +# have continued to flow normally. The time in the guest should now +# be behind the time in the host by exactly the amount of time during +# which ticks have been missed. +# +# @slew: deliver ticks at a higher rate to catch up with the missed ticks. +# The guest OS will not notice anything is amiss, as from its point +# of view time will have continued to flow normally. Once the timer +# has managed to catch up with all the missing ticks, the time in +# the guest and in the host should match. +# +# Since: 2.0 +## +{ 'enum': 'LostTickPolicy', + 'data': ['discard', 'delay', 'slew' ] } + +## # @NumaOptionsType: # # @node: NUMA nodes configuration |