Re: [Xen-devel] live migrating hvm from 4.4 to 4.7 fails in ioreq server

[Olaf Hering <olaf@xxxxxxxxx>]

On Wed, May 11, Andrew Cooper wrote:

> On 11/05/16 13:18, Olaf Hering wrote:
> > Migrating a HVM guest from staging-4.4 to staging fails:
> >
> > # cat /var/log/xen/qemu-dm-fv-x64-sles12sp1-clean--incoming.log
> > char device redirected to /dev/pts/3 (label serial0)
> > xen: ioreq server create: Cannot allocate memory
> > qemu-system-x86_64: xen hardware virtual machine initialisation failed
> >
> > Looks like hvm_alloc_ioreq_gmfn finds no bit in
> > d->arch.hvm_domain.ioreq_gmfn.mask.  Is there a slim change that 4.4 does 
> > not
> > know about HVM_PARAM_NR_IOREQ_SERVER_PAGES, and as a result 4.7 fails to
> > configure the guest properly?
> 
> HVM_PARAM_NR_IOREQ_SERVER_PAGES was introduced in 4.6 iirc.  CC'ing Paul
> who did this work.

Migration from staging-4.4 to staging-4.6 fails in the same way. We did
not have a 4.6 based Xen, so noone noticed until now.

Olaf

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