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

[Paolo Bonzini]

On 01/27/2012 02:30 PM, Daniel P. Berrange wrote:
> Yep, I tend to agree. We should have
>
>    1. rawio="yes|nmo"  on the<disk>  element somewhere
>    2. Give the QEMU process CAP_SYS_RAWIO
>    3. Use the devices cgroup to specify which individual disks
>       can use rawio.
>
> That said I don't think we need to block the entire patch, just waiting
> for #3.  I think it is acceptable to implement #1&  #2 right now,
> provided that we mark the domain as tainted. After all if we don't do
> #1&  #2, then people are just going to set clear_emulator_capabilities=0
> which is even more insecure.

Yeah, tainting makes sense.  Once we implement #3 we can remove the taint.

Paolo