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Description of problem:

virtio guest, kvm host:

    # uname -r
    2.6.32-80.el6.x86_64

    # ethtool -i eth0
    Cannot get driver information: Operation not supported

pv guest, xen host:

    # uname -r
    2.6.32-80.el6.x86_64

    # ethtool -i eth0
    Cannot get driver information: Operation not supported

pv on hvm guest (with vif = [ "...,type=netfront" ]), xen host:

    # uname -r
    2.6.32-80.el6.x86_64

    # ethtool -i eth0
    Cannot get driver information: Operation not supported

"ethtool -i" should print the driver name and the bus info.

This bug for RHEL6 is similar to bugs 647187/647196 (netfront/virtio_net) for RHEL4 and to bugs 643292/645646 (netfront/virtio_net) for RHEL5. For RHEL6 only a common bug is submitted, because the fix is a commonly effective backport of the following upstream patch ("ethtool.c" part):

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=01414802054c382072b6cb9a1bdc6e243c74b2d5#patch17

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Patch(es) available on kernel-2.6.32-83.el6

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html