Avi Kivity wrote:
Anthony Liguori wrote:
Mark McLoughlin wrote:
Allow users to pass an IFF_VNET_HDR tap fd via "-net tap,fd=X"
by querying the fd with the recently added TUNGETIFF ioctl() to
see if IFF_VNET_HDR has been enabled.
Note: users wishing to pass an IFF_VNET_HDR tap fd to qemu
should check both that a) this version of qemu can handle
such an fd and b) that the TUNGETIFF ioctl() is available in
the running kernel.
We add a comment to the "qemu -help" output to indicate to
users that this version of qemu supports IFF_VNET_HDR.
The -help output is not a supported interface. An info command in the
monitor would be a better way to detect this.
You need to know this before you create a virtual machine. I suggested
a 'qemu -capabilities' thing to describe what this qemu can do.
$ echo -e 'info version\nquit' | qemu-system-x86_64 -S -hda /dev/null
-monitor stdio -vnc none
Okay, a little hacky, but so are a lot of things that libvirt is doing :-)
A proper -version flag that also has a bitmap of 'features' may be
reasonable too.
Regards,
Anthony Liguori
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