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In Xen, dom0 is really just another domain that supports ballooning, adding/removing devices, changing vcpu configuration, etc. This patch adds support to the libxl driver for managing dom0. Note that the legacy xend driver has long supported managing dom0. Operations that are not supported on dom0 are filtered in libvirt where a sensible error is reported. Errors from libxl are not always helpful. E.g., attempting a save on dom0 results in 2015-06-23 15:25:05 MDT libxl: debug: libxl_dom.c:1570:libxl__toolstack_save: domain=0 toolstack data size=8 2015-06-23 15:25:05 MDT libxl: debug: libxl.c:979:do_libxl_domain_suspend: ao 0x7f7e68000b70: inprogress: poller=0x7f7e68000930, flags=i 2015-06-23 15:25:05 MDT libxl-save-helper: debug: starting save: Success 2015-06-23 15:25:05 MDT xc: detail: xc_domain_save_suse: starting save of domid 0 2015-06-23 15:25:05 MDT xc: error: Couldn't map live_shinfo (3 = No such process): Internal error 2015-06-23 15:25:05 MDT xc: detail: Save exit of domid 0 with errno=3 2015-06-23 15:25:05 MDT libxl-save-helper: debug: complete r=1: No such process 2015-06-23 15:25:05 MDT libxl: error: libxl_dom.c:1876:libxl__xc_domain_save_done: saving domain: domain did not respond to suspend request: No such process 2015-06-23 15:25:05 MDT libxl: error: libxl_dom.c:2033:remus_teardown_done: Remus: failed to teardown device for guest with domid 0, rc -8 Signed-off-by: Jim Fehlig <jfehlig@suse.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>