[libvirt] [Qemu-devel] [PATCH v4] Add support for fd: protocol

[Corey Bryant]

On 08/22/2011 11:38 AM, Christoph Hellwig wrote:
> I'm still totally against this.  FD passing is a nice feature for sandboxing,
> but the passing should be between closely cooperating programs.  We'll
> need a tool shipped from the qemu source tree to open and set up the
> FDs, and not someone external.  With that setup in place we can use
> a protocol similar to the various OpenBSD privilegue separated deaemons
> to also allow reopening / snapshots / etc.
>
> Opening fds in libvirt and passing them into qemu is exactly the wrong way,
> and just cements the current horrors where libvirt duplicates parsing
> of image format headers.
>

This is following suit with exiting support that passes an fd for a TAP 
interface.  Libvirt already passes a file descriptor to Qemu via '-net 
tap,fd='.  Are you against that as well?

Regards,
Corey