The first patch addresses performance regression introduced by XSA-336 fixes.
This patch could be considered as a candidate for inclusion in 4.15.

The second patch is a minor cleanup and can safely wait until after 4.15.


Boris Ostrovsky (2):
  x86/vpt: Do not take pt_migrate rwlock in some cases
  x86/vpt: Simplify locking argument to write_{un}lock

 xen/arch/x86/hvm/vpt.c        | 48 +++++++++++++++++++++++++++++++++----------
 xen/include/asm-x86/hvm/vpt.h | 18 ++++++++++------
 2 files changed, 49 insertions(+), 17 deletions(-)

-- 
1.8.3.1

Boris Ostrovsky writes ("[PATCH v3 0/2] Performance regression due to XSA-336"):
> The first patch addresses performance regression introduced by XSA-336 fixes.
> This patch could be considered as a candidate for inclusion in 4.15.

Thank you, but I think this is too late for 4.15.

Regards,
Ian.