Re: [libvirt] [PATCH v3 0/5] RFC: grant KVM guests retain arbitrary capabilities

On Thu, Jan 12, 2012 at 04:25:27PM +0900, Taku Izumi wrote: > Hi Osier-san, Daniel-san, and all, > > This patchset adds an option for KVM guests to retain arbitrary capabilities. > The previous versions are here: > http://www.redhat.com/archives/libvir-list/2011-December/msg00857.html > http://www.redhat.com/archives/libvir-list/2011-December/msg00950.html Can you give me a little more detail on why you need to make KVM keep certain capabilities. In your first message you mention that you need to have 'rawio' for QEMU ?

I am now wondering if we should do this in a different way. ie if there is some XML configuration parameter for the <disk> that indicates the need for rawio, then libvirt could automatically ensures that we add CAP_SYS_RAWIO when starting QEMU.

Likewise with type=ethernet, we could probably give QEMU the CAP_SYS_NETADMIN capability. To me this feels nicer directly exposing capabilities in the XML, since these are really an internal impl detail, not a guest configuration thing.