Re: [PATCH v2 1/1] modules: load modules from versioned /var/run dir

["Daniel P. Berrangé" <berrange@redhat.com>]

On Tue, Mar 10, 2020 at 03:58:06PM +0100, Christian Ehrhardt wrote:
> On upgrades the old .so files usually are replaced. But on the other
> hand since a qemu process represents a guest instance it is usually kept
> around.
> 
> That makes late addition of dynamic features e.g. 'hot-attach of a ceph
> disk' fail by trying to load a new version of e.f. block-rbd.so into an
> old still running qemu binary.
> 
> This adds a fallback to also load modules from a versioned directory in the
> temporary /var/run path. That way qemu is providing a way for packaging
> to store modules of an upgraded qemu package as needed until the next reboot.
> 
> An example how that can then be used in packaging can be seen in:
> https://git.launchpad.net/~paelzer/ubuntu/+source/qemu/log/?h=bug-1847361-miss-old-so-on-upgrade-UBUNTU
> 
> Fixes: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1847361
> Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
> ---
>  configure     | 15 +++++++++++++++
>  util/module.c | 14 ++++++++++++++
>  2 files changed, 29 insertions(+)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>


Regards,
Daniel
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