diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-28 15:35:56 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-03-06 10:04:57 +0000 |
| commit | 2147106172266c3f38b167ead97bd17eeaab85a0 (patch) | |
| tree | 2cf3707e6391785e804d4e4d23b272de9e33a308 /docs/system | |
| parent | e324ded0074e1dc884e4f9ae0f1d92be06b99294 (diff) | |
qemu-doc: move qemu-tech.texi into main section
The only remaining content in qemu-tech.texi is a few paragraphs
about managed start up options. Move them in the main section
about full system emulation.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200228153619.9906-11-peter.maydell@linaro.org
Message-id: 20200226113034.6741-11-pbonzini@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/system')
| -rw-r--r-- | docs/system/managed-startup.texi | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/docs/system/managed-startup.texi b/docs/system/managed-startup.texi new file mode 100644 index 0000000000..ec168095cc --- /dev/null +++ b/docs/system/managed-startup.texi @@ -0,0 +1,35 @@ +@node managed_startup +@section Managed start up options + +In system mode emulation, it's possible to create a VM in a paused state using +the -S command line option. In this state the machine is completely initialized +according to command line options and ready to execute VM code but VCPU threads +are not executing any code. The VM state in this paused state depends on the way +QEMU was started. It could be in: +@table @asis +@item initial state (after reset/power on state) +@item with direct kernel loading, the initial state could be amended to execute +code loaded by QEMU in the VM's RAM and with incoming migration +@item with incoming migration, initial state will by amended with the migrated +machine state after migration completes. +@end table + +This paused state is typically used by users to query machine state and/or +additionally configure the machine (by hotplugging devices) in runtime before +allowing VM code to run. + +However, at the -S pause point, it's impossible to configure options that affect +initial VM creation (like: -smp/-m/-numa ...) or cold plug devices. The +experimental --preconfig command line option allows pausing QEMU +before the initial VM creation, in a ``preconfig'' state, where additional +queries and configuration can be performed via QMP before moving on to +the resulting configuration startup. In the preconfig state, QEMU only allows +a limited set of commands over the QMP monitor, where the commands do not +depend on an initialized machine, including but not limited to: +@table @asis +@item qmp_capabilities +@item query-qmp-schema +@item query-commands +@item query-status +@item x-exit-preconfig +@end table |