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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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.

~Andrew

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