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Description of problem:
Attempt to save a domain with intel-iommu results in an error from qemu

Version-Release number of selected component (if applicable):


How reproducible:
100 %

Steps to Reproduce:
1. Start a domain with <iommu model='intel'/> device
2. virsh save <domain> <path>

Actual results:
error: internal error: unable to execute QEMU command 'migrate': State blocked by non-migratable device 'iommu-intel'

Expected results:
Libvirt reports an error before attempting to migrate.

Additional info:
https://bugzilla.redhat.com/show_bug.cgi?id=1235581#c16

Upstream patch:
https://www.redhat.com/archives/libvir-list/2017-March/msg01065.html

Pushed upstream as:
commit b7118623ad5a8e6ea75d693881c08873eefa3e28
Author:     Ján Tomko <jtomko>
CommitDate: 2017-03-23 16:35:40 +0100

    qemu: forbid migration with an IOMMU device
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1433994

git describe: v3.1.0-243-gb711862

Maybe forbid IOMMU migration from libvirt side for 7.4 is a good idea. However logically speaking upstream QEMU should have already supported general VT-d migration since commit:

commit 8cdcf3c1e58d04b6811956d7608efeb66c42d719
Author: Peter Xu <peterx>
Date:   Fri Jan 6 12:06:13 2017 +0800

    intel_iommu: allow migration

Thanks,

Oops, reverted now:

commit da17090b8ce4f9a2df9529227cbe502cfab21c8f
Author:     Ján Tomko <jtomko>
CommitDate: 2017-03-24 12:52:07 +0100

    Revert "qemu: forbid migration with an IOMMU device"

git describe: v3.1.0-254-gda17090

Seems there is no way to tell whether this is supported or not other than trying it.