[Skiboot] [PATCH v2] xive: Add calls to save/restore the queues and VPs HW state

[Stewart Smith]

Cédric Le Goater <clg at kaod.org> writes:
> To be able to support migration of guests using the XIVE native
> exploitation mode, (where the queue is effectively owned by the
> guest), KVM needs to be able to save and restore the HW-modified
> fields of the queue, such as the current queue producer pointer and
> generation bit, and to retrieve the modified thread context registers
> of the VP from the NVT structure : the VP interrupt pending bits.
>
> However, there is no need to set back the NVT structure on P9. P10
> should be the same.
>
> Based on previous work from BenH.
>
> Signed-off-by: Cédric Le Goater <clg at kaod.org>
> ---
>  include/opal-api.h |   7 +--
>  hw/xive.c          | 130 +++++++++++++++++++++++++++++++++++++++++++++
>  doc/xive.rst       |  51 ++++++++++++++++++
>  3 files changed, 185 insertions(+), 3 deletions(-)

Thanks for this, merged to master as of
bbcbbd3e071ffe654596ce19ddf8d99b4176bbc3 and in v6.3-rc1.

I wish I knew more XIVE deep details to provide better review, or had
the time to get deep enough to provide deeper review, but hey, you're
smart and have spent a lot of time around it, so it's probably right :)


-- 
Stewart Smith
OPAL Architect, IBM.