[libvirt] Some problem with the save function

[Charles Duffy]

Daniel P. Berrange wrote:
> Hmm, bad error message :-(  We might also need todo a chown()
> in the restore path to allow QEMU to read it. NB there is no
> compatability between QEMU version, so if you have upgraded
> your install of QEMU between the time you saved & restored
> it is very likely to crash & burn.

How difficult would it be to set up named pipes for save and restore 
operations, and splice from those pipes to the actual files on the 
libvirtd side? Seems much preferable from a security perspective to 
chown'ing things around, and (unlike pipes set up ahead of time with 
pipe() and friends) shouldn't be disrupted by a libvirtd restart.