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Re: [libvirt] [PATCH] qemu_cgroup: Only try to allow devices if devices CGroup's available

On Wed, Feb 22, 2017 at 04:38:59PM +0100, Michal Privoznik wrote:
When a domain needs an access to some device (be it a disk, RNG,
chardev, whatever), we have to allow it in the devices CGroup (if
it is available), because by default we disallow all the devices.
But some of the functions that are responsible for setting up
devices CGroup are lacking check whether there is any CGroup
available. Thus users might be unable to hotplug some devices:

 virsh # attach-device fedora rng.xml
 error: Failed to attach device from rng.xml
 error: internal error: Controller 'devices' is not mounted

Signed-off-by: Michal Privoznik <mprivozn redhat com>
src/qemu/qemu_cgroup.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)



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