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.

USB4 is the public specification of Thunderbolt 3 protocol. Besides the kernel level changes ([1]) it also needs bolt to authorize the PCIe tunnels, very much as Thunderbolt 3. It is expected that USB4 hardware is accompanied with an IOMMU based DMA protection which the existing bolt (version 0.8) already supports. But there are additional information, including whether a system is Thunderbolt 3 or USB4 (hardware generation), that needs to be exposed, which require a newer (yet unreleased) bolt. Especially the hardware generation information is important for user facing tools and software like GNOME Settings to properly communicate the hardware information (read: "USB4" strings instead of "Thunderbolt", which could otherwise be confusing). 

[1] https://lore.kernel.org/lkml/20191001113830.13028-1-mika.westerberg@linux.intel.com/

Built bolt-0.9-1.el8 (https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=1226118) for bolt 0.9.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (bolt bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:4577