[libvirt] RFC: add <currentVcpu> element

[Daniel Veillard]

On Tue, Sep 28, 2010 at 01:36:13PM -0600, Eric Blake wrote:
> On 09/27/2010 11:20 AM, Eric Blake wrote:
> >No change to existing API semantics, although the implementation can
> >wrap old APIs to call the new ones with appropriate flags where
> >appropriate to minimize code duplication.
> 
> One more API to think about:
> 
> virDomainGetInfo returns a virDomainInfoPtr, where that struct
> includes an unsigned short nrVirtCpu member.  I'm assuming that
> since this is a public struct involved in on-the-wire RPC protocol,
> we can't change it to add a new member (and it also implicitly means
> that we are limited to 64k vcpus, even though the unsigned int
> argument of virDomainSetVcpus could otherwise go larger).  Given my

  it's a public struct so immutable now, right

> testing, it looks like this field tracks live changes from virsh
> setvcpus, so this now needs to be explicitly documented as the
> current vcpu rather than the maximum, when the two differ.  Which

 yes

> means we have another synonym:
> 
> >>- current vcpu on running guests
> >
> >virDomainGetVcpusFlags(,VIR_DOMAIN_VCPU_ACTIVE)
> >virDomainGetVcpus() + parsing pinning info
> virDomainGetInfo()

  agreed,

Daniel

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