Re: [PATCH v2 05/22] qemu: support automatic VM managed save in system daemon

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On Wed, Mar 12, 2025 at 17:17:45 +0000, Daniel P. Berrangé wrote:
> Currently automatic VM managed save is only performed in session
> daemons, on desktop session close, or host OS shutdown request.
> 
> With this change it is possible to control shutdown behaviour for
> all daemons. A recommended setup might be:
> 
>   auto_shutdown_try_save = "persistent"
>   auto_shutdown_try_shutdown = "all"
>   auto_shutdown_poweroff = "all"
> 
> Each setting accepts 'none', 'persistent', 'transient', and 'all'
> to control what types of guest it applies to.
> 
> For historical compatibility, for the system daemon, the settings
> currently default to:
> 
>   auto_shutdown_try_save = "none"
>   auto_shutdown_try_shutdown = "none"
>   auto_shutdown_poweroff = "none"
> 
> while for the session daemon they currently default to
> 
>   auto_shutdown_try_save = "persistent"
>   auto_shutdown_try_shutdown = "none"
>   auto_shutdown_poweroff = "none"
> 
> The system daemon settings should NOT be enabled if the traditional
> libvirt-guests.service is already enabled.
> 
> Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
> ---
>  src/qemu/libvirtd_qemu.aug         |  3 ++
>  src/qemu/qemu.conf.in              | 42 +++++++++++++++++++
>  src/qemu/qemu_conf.c               | 65 ++++++++++++++++++++++++++++++
>  src/qemu/qemu_conf.h               |  4 ++
>  src/qemu/qemu_driver.c             |  9 ++---
>  src/qemu/test_libvirtd_qemu.aug.in |  3 ++
>  6 files changed, 121 insertions(+), 5 deletions(-)

[...]

> diff --git a/src/qemu/qemu.conf.in b/src/qemu/qemu.conf.in
> index 31172303dc..a674e11388 100644
> --- a/src/qemu/qemu.conf.in
> +++ b/src/qemu/qemu.conf.in
> @@ -639,6 +639,48 @@
>  #
>  #auto_start_delay = 0
>  
> +# The settings for auto shutdown actions accept one of
> +# four possible options:
> +#
> +# * "none" - do not try to save any running VMs
> +# * "persistent" - only try to save persistent running VMs
> +# * "transient" - only try to save transient running VMs
> +# * "all" - try to save all running VMs
> +#
I'd suggest you change the commented-out empty line here to uncommented,
to separate the docs for auto_shutdown_try_save from the common section
above.

> +# Whether to perform managed save of running VMs if a host OS
> +# shutdown is requested (system/session daemons), or the desktop
> +# session terminates (session daemon only).
> +#
> +# Defaults to "persistent" for session daemons and "none"
> +# for system daemons. The values "all" and "transient" are
> +# not permitted for this setting, since managed save is not
> +# implemented for transient VMs.
> +#
> +# If 'libvirt-guests.service' is enabled, then this must be
> +# set to 'none' for system daemons to avoid dueling actions
> +#auto_shutdown_try_save = "persistent"
> +

Reviewed-by: Peter Krempa <pkrempa@xxxxxxxxxx>




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