[Xen-devel] backporting considerations (Re: [PATCH v9 0/9] xen/x86: various XPTI speedups)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 26.04.18 at 13:33, <jgross@xxxxxxxx> wrote:
> Juergen Gross (9):
>   x86/xpti: avoid copying L4 page table contents when possible
>   xen/x86: add a function for modifying cr3
>   xen/x86: support per-domain flag for xpti
>   xen/x86: use invpcid for flushing the TLB
>   xen/x86: disable global pages for domains with XPTI active
>   xen/x86: use flag byte for decision whether xen_cr3 is valid
>   xen/x86: convert pv_guest_cr4_to_real_cr4() to a function
>   xen/x86: add some cr3 helpers
>   xen/x86: use PCID feature

This being a performance improvement rather than a plain bug fix series,
I'm not entirely certain about backporting here. My current thinking is to
put this into 4.10 (Jürgen was kind enough to do the backporting work
already), but not into any older trees. Otoh at SUSE we already have
this in our 4.9-based branch as well, and if other consumers of that or
the 4.8 branch would mostly agree it should go there, I could certainly
be convinced. It is imo out of question of putting it into 4.7 or older.

Jan


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