Re: [Libvir] Dom0 and entitlement

Katti, Vadiraj (STSD-Openview) wrote: These sound more like Xen questions, but anyway ... In Xen, dom0 is "just" one of the normal guests that runs on top of the hypervisor. However it has special / privileged treatment and is essential to the system. XenSource have discussed scenarios where there are multiple dom0's, but I don't know if this has ever been implemented. If I understand the question, then /proc on dom0 reflects the state of the dom0 guest, not the underlying system. libvirt gives you methods to access status of the whole system (but only from dom0 because it requires some privileged calls). virt-manager uses libvirt, so it shows the state of the whole machine. You can't. Guests can send out packets with any source IP they like, and its up to DHCP / manual configuration / firewall rules to enforce (or not) local policy. A guest may have several network interfaces or none at all. A guest can discover that it is running under virtualization very easily (even a fullvirt guest). Probably the best place to start is to use something like HAL (http://www.freedesktop.org/wiki/Software/hal) to examine the hardware available. You'll see that emulated processors and devices have QEMU-related names under Xen and KVM, since both Xen and KVM use QEMU to emulate devices. For example, on a fullvirt guest running under KVM: $ hal-device [...] 4: udi = '/org/freedesktop/Hal/devices/storage_serial_QM00001' [...] info.product = 'QEMU HARDDISK' (string) 5: udi = '/org/freedesktop/Hal/devices/storage_serial_QM00003' [...] info.product = 'QEMU CD-ROM' (string) $ grep QEMU /proc/cpuinfo model name : QEMU Virtual CPU version 0.9.0 The presence of an RTL-8139 network card and Cirrus Logic GD 5446 graphics card is a bit of a giveaway too. These are the standard devices that QEMU emulates, but under Xen paravirt you'll have Xen/paravirt-specific devices. A Xen dom0 specifically will have a file '/proc/xen/privcmd'. There are so many different types of virtualization, and degrees of virtualization, no one to my knowledge has written an exhaustive set of tests for this. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903