Re: Live migration and PV device handling

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 03/04/2020 13:32, Anastassios Nanos wrote:
> Hi all,
>
> I am trying to understand how live-migration happens in xen. I am
> looking in the HVM guest case and I have dug into the relevant parts
> of the toolstack and the hypervisor regarding memory, vCPU context
> etc.
>
> In particular, I am interested in how PV device migration happens. I
> assume that the guest is not aware of any suspend/resume operations
> being done

Sadly, this assumption is not correct.  HVM guests with PV drivers
currently have to be aware in exactly the same way as PV guests.

Work is in progress to try and address this.  See
https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=775a02452ddf3a6889690de90b1a94eb29c3c732
(sorry - for some reason that doc isn't being rendered properly in
https://xenbits.xen.org/docs/ )

~Andrew