[v3,0/9] Add alternative API for Xen PTEs

Message

Xia, Hongyan Oct. 2, 2019, 5:16 p.m. UTC

This batch adds an alternative alloc-map-unmap-free Xen PTE API to the
normal alloc-free on the xenheap, in preparation of switching to domheap
for Xen page tables. Since map and unmap are basically no-ops now, and
other changes are cosmetic to ease future patches, this batch does not
introduce any functional changes.

tree:
https://xenbits.xen.org/git-http/people/hx242/xen.git xen_pte_map-v3

v2: 
https://lists.xenproject.org/archives/html/xen-devel/2019-09/msg03221.html

---
Changed since v2:
- split into a smaller series
- drop the clear_page optimisation as Wei suggests
- rebase

Changed since v1:
- squash some commits
- merge bug fixes into this first batch
- rebase against latest master

Wei Liu (9):
  x86: move some xen mm function declarations
  x86: introduce a new set of APIs to manage Xen page tables
  x86/mm: introduce l{1,2}t local variables to map_pages_to_xen
  x86/mm: introduce l{1,2}t local variables to modify_xen_mappings
  x86/mm: map_pages_to_xen should have one exit path
  x86/mm: add an end_of_loop label in map_pages_to_xen
  x86/mm: make sure there is one exit path for modify_xen_mappings
  x86/mm: add an end_of_loop label in modify_xen_mappings
  x86/mm: change pl*e to l*t in virt_to_xen_l*e

 xen/arch/x86/mm.c          | 300 +++++++++++++++++++++++--------------
 xen/include/asm-x86/mm.h   |  16 ++
 xen/include/asm-x86/page.h |   5 -
 3 files changed, 206 insertions(+), 115 deletions(-)