[v5,0/7] Add alternative API for XEN PTEs

Message

Xia, Hongyan Jan. 7, 2020, 12:06 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 directnonmap-v3

---
Changed since v4:
- handle INVALID_MFN in new APIs
- drop some goto labels since there could be better options
- const qualify introduced variables
- defer some changes to future patches due to ongoing discussions on
  map_pages_to_xen

Changed since v3:
- change my email address in all patches
- address many style issues in v3
- rebase

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 (7):
  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 would better have one exit path
  x86/mm: make sure there is one exit path for modify_xen_mappings
  x86/mm: change pl*e to l*t in virt_to_xen_l*e

 xen/arch/x86/mm.c          | 258 ++++++++++++++++++++++++++++-----------------
 xen/include/asm-x86/mm.h   |  16 +++
 xen/include/asm-x86/page.h |   5 -
 3 files changed, 175 insertions(+), 104 deletions(-)