[fedora-virt] guestfish, libguestfs, ext4 and bad perms on /dev/kvm
Richard W.M. Jones
rjones at redhat.com
Wed Apr 22 20:17:29 UTC 2009
On Wed, Apr 22, 2009 at 03:20:14PM -0400, Robert P. J. Day wrote:
> in short, ext4 filesystem support now appears to work, but there's
> still the issue (perhaps addressed earlier) that non-root users don't
> have access to KVM support but, from the perspective of libguestfs,
> does that really matter?
KVM makes things do a lot faster, which is always nice. You can
do the following:
# chmod o+rw /dev/kvm
You have to do (just) that command as root, but after that qemu-kvm and
guestfish itself can all be run as non-root, and will benefit from KVM
acceleration.
There is the question of whether it's safe to allow non-root users to
use KVM. Generally the answer seems to be that it's OK. But if you
are running a production service, or have lots of untrusted users or
guests, then maybe it's better not to turn this on just yet.
> anyway, ext4 support is in there so things are working, at least to
> the extent that i've tested it.
> p.s. i could have sworn i didn't get that /dev/kvm perms error
> yesterday. did something about that change since version 1.0.4?
Yes, libguestfs changed to detect and enable KVM by default. Before
today it wasn't using KVM at all.
Rich.
--
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