+++ This bug was initially created as a clone of Bug #1579681 +++ (This bug is a follow-up item to the: https://bugzilla.redhat.com/show_bug.cgi?id=1547954 -- Deployment RFE: add ability to configure extra CPU flags for named CPU models) This introduced the Nova configuration attribute `[libvirt]/cpu_model_extra_flags`, we have restricted the choices to be only 'PCID' -- to alleviate the immediate guest performance degradation as a result of applying the "Meltdown" CVE fixes. Now remove that restriction to allow adding and removing multiple CPU flags, making way for other use cases. Use cases: - Ability to use 1GB huge pages with Haswell model as one use case for extra flags: cpu_model=Haswell-noTSX-IBRS cpu_model_extra_flags="pdpe1gb" - Nested Virtualization -- an operator can specify the Intel 'vmx' or AMD 'svm' flags in the level-1 Nova guest.
This bug is marked for inclusion in the errata but does not currently contain draft documentation text. To ensure the timely release of this advisory please provide draft documentation text for this bug as soon as possible. If you do not think this bug requires errata documentation, set the requires_doc_text flag to "-". To add draft documentation text: * Select the documentation type from the "Doc Type" drop down field. * A template will be provided in the "Doc Text" field based on the "Doc Type" value selected. Enter draft text in the "Doc Text" field.
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, 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/RHBA-2018:2574