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Re: [Libvir] [PATCH 1/2] virDomainMigrate implementation (Xen only, no remote, no qemu, no virsh)



On Mon, Jul 16, 2007 at 08:20:54AM -0700, Dan Smith wrote:
> DB> I don't.  The API should be hypervisor agnostic. Needing to pass
> DB> HV specific attributes to make it works shows we have failed.
> 
> In that case, haven't we already failed with virDomainCreate() since
> it takes hypervisor-specific XML?  Doesn't the presence of
> VIR_DEVICE_RW_FORCE imply knowledge of Xen-specific behavior?

The XML is *not* hypervisor specific. There is a subtle difference is between 
hypervisor specific concepts, and generic concepts which may only only be
relevant to a sub-set of hypervisors. 

> How would you handle someone wanting to use tcp:// or ssh:// with
> qemu?

If we need to express some choice of data channel, TCP, vs SSH, vs SSL/TLS
then figure out a way to expose that in the API with an hypervisor agnostic
way. Exposing raw QEMU migration URIs is *not* hypervisor agnostic. Exposing
a flag  VIR_CHANNEL_CLEAR, VIR_CHANNEL_SSH, VIR_CHANNEL_TLS is agnostic
because it allows the same syntax to be used regardless of driver. Now some
drivers may only support a subset of channel types, but that's OK.

Dan.
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