RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Old-enough RHEL6 machine types generate hda-audio v1 migration data.  Even though the same machine types in RHEL7 should generate v2 migration data, we need to read version 1.

This should be doable upstream too (using minimum_version_id_old).

Hmm, I think this works just fine, upstream vmstate:

static const VMStateDescription vmstate_hda_audio = {
    .name = "hda-audio",
    .version_id = 2,
    .post_load = hda_audio_post_load,
    .fields = (VMStateField []) {
        VMSTATE_STRUCT_ARRAY(st, HDAAudioState, 4, 0,
                             vmstate_hda_audio_stream,
                             HDAAudioStream),
        VMSTATE_BOOL_ARRAY(running_compat, HDAAudioState, 16),
        ^^^^ v1 compat field
        VMSTATE_BOOL_ARRAY_V(running_real, HDAAudioState, 2 * 16, 2),
        VMSTATE_END_OF_LIST()
    }
};

IIRC rhel-6 has a rhel-only patch to also *generate* v1 on old machine types,
which isn't needed on rhel-7.

Right, this works fine.  I don't know why I thought that .minimum_version_id = 0 means "only .version_id supported", instead it means "all versions supported" of course.