[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Does XEN use TUN/TAP interface?
On Sun, Mar 16, 2008 at 06:21:51PM +0100, Daniel Stodden wrote: > On Sun, 2008-03-16 at 17:12 +0000, Daniel P. Berrange wrote: > > On Sun, Mar 16, 2008 at 05:50:19PM +0100, Daniel Stodden wrote: > > > On Sun, 2008-03-16 at 15:52 +0100, Pavel Muller wrote: > > > > Hello, > > > > I want to ask if XEN use TUP/TAP interfaces or use other interface? > > > > > > No. TUN/TAP is typically used for hosted VMs. Broadly speaking, it's > > > only useful if a significant part of the VMM is running in user mode on > > > top of a native Linux, as is the case with VMware Workstation, > > > VirtualBox, UserModeLinux etc. > > > > > > Xen is a hypervisor, running below all OSes on bare hardware. The > > > network virtualization is based on a Linux OS (dom0), but the guests > > > aren't running on top of that, but rather as siblings on a common > > > virtualization layer. > > > > Whether it is a separate hypervisor / Dom0, or a combined HV+Dom0 is not > > really relevant to this question. In both cases the driver backends are > > in the Linux host OS and not the hypervisor itself. > > Using TUN/TAP is absolutely pointless if the peer is not running in > userland. Because connecting userspace to a network interface is the > whole point there. > > And this is why the VMM type matters to answer the question. No the distinction here is between kernel space & user space backends, not between host OS and hypervisor. The hypervisor doesn't get involved in the driver backends - it is delegated to the host OS to take care of. Dan. -- |: Red Hat, Engineering, Boston -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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