Re: [Xen-devel] [PATCH v10 00/16] improve late microcode loading

[Jan Beulich <jbeulich@xxxxxxxx>]

On 12.09.2019 09:22, Chao Gao wrote:
> This series includes below changes:
>  1. Patch 1-11: introduce a global microcode cache and some cleanup
>  2. Patch 12: synchronize late microcode loading
>  3. Patch 13: support parallel microcodes update on different cores
>  4. Patch 14: block #NMI handling during microcode loading
>  5. Patch 15: disable late ucode loading due to BDF90
>  6. Patch 16: call wbinvd() conditionally

I don't know why it didn't occur to me earlier, but what about
parked / offlined CPUs? They'll have their ucode updated when they
get brought back online, but until then their ucode will disagree
with that of the online CPUs. For truly offline CPUs this may be
fine, but parked ones should probably be updated, perhaps via the
same approach as used when C-state data becomes available (see
set_cx_pminfo())?

Jan

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel