Re: [PATCH V3 16/22] chardev: cpr framework

[Eric Blake]

On 5/7/21 7:25 AM, Steve Sistare wrote:
> Add QEMU_CHAR_FEATURE_CPR for devices that support cpr.
> Add the chardev close_on_cpr option for devices that can be closed on cpr
> and reopened after exec.
> cpr is allowed only if either QEMU_CHAR_FEATURE_CPR or close_on_cpr is set
> for all chardevs in the configuration.
> 
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> ---

> +++ b/qapi/char.json
> @@ -204,12 +204,15 @@
>  # @logfile: The name of a logfile to save output
>  # @logappend: true to append instead of truncate
>  #             (default to false to truncate)
> +# @close-on-cpr: if true, close device's fd on cprsave. defaults to false.
> +#                since 6.0.

6.1, actually.


> @@ -3182,6 +3196,10 @@ The general form of a character device option is:
>      ``logappend`` option controls whether the log file will be truncated
>      or appended to when opened.
>  
> +    Every backend supports the ``close-on-cpr`` option.  If on, the
> +    devices's descriptor is closed during cprsave, and reopened after exec.

device's

> +    This is useful for devices that do not support cpr.
> +
>  The available backends are:
>  
>  ``-chardev null,id=id``
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org