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Re: [libvirt] Allow to undefine a running domain



On 08/19/2011 08:03 AM, Osier Yang wrote:
Per API virDomainUndefineFlags' doc says, if a domain is running,
it will be converted to transient, but keep running. However,
the drivers prohibit one undefining a running domain.

This patch series modify the internal domainUndefineFlags function
of all drivers (except some driver don't need to check if the
domain is running, it's handled by the underlying hypervisor, such
as ESX and XEND).

The principle is:

1) Set vm->persistent = 0 for a running domain
2) domainDestroy and domainShutdown will take care of remove the
domain obj from the hash table.

For hypervisors like qemu that already support transient domains, this is good. But I worry that for hypervisors like esx, which currently have no notion of a transient domain, this is wrong (that is, esx domains are always persistent, because the domain state is maintained by esx and libvirt merely queries esx which domains exist, running or otherwise; if esx doesn't support transient domains natively, then libvirt can't fake it). Thus, for domains where virDomainIsPersistent always returns true (such as esx), I think you need to keep the restriction that attempts to undefine a running domain are rejected, because the hypervisor lacks transient domain support.


[PATCH 1/8] libxl: Allow to undefine a running domain
[PATCH 2/8] lxc: Allow to undefine a running domain
[PATCH 3/8] openvz: Allow to undefine a running domain
[PATCH 4/8] qemu: Allow to undefine a running domain
[PATCH 5/8] test: Allow to undefine a running domain
[PATCH 6/8] uml: Allow to undefine a running domain
[PATCH 7/8] vmware: Allow to undefine a running domain
[PATCH 8/8] xen: Allow to undefine a running domain (xm_internal)

Split the patches for easy reviewing, will merge when committing
if need.

Nope, keep it separate; that way we can apply just the hypervisors that need it.

--
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org


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