[PATCH 00/16] Remove the direct map

[Hongyan Xia <hx242@xxxxxxx>]

From: Hongyan Xia <hongyxia@xxxxxxxxxx>

This series depends on Xen page table domheap conversion:
https://lists.xenproject.org/archives/html/xen-devel/2020-04/msg01374.html.

After breaking the reliance on the direct map to manipulate Xen page
tables, we can now finally remove the direct map altogether.

This series:
- fixes many places that use the direct map incorrectly or assume the
  presence of an always-mapped direct map in a wrong way.
- includes the early vmap patches for global mappings.
- initialises the mapcache for all domains, disables the fast path that
  uses the direct map for mappings.
- maps and unmaps xenheap on-demand.
- adds a boot command line switch to enable or disable the direct map.

This previous version was in RFC state and can be found here:
https://lists.xenproject.org/archives/html/xen-devel/2019-09/msg02647.html,
which has since been broken into small series.

Hongyan Xia (12):
  acpi: vmap pages in acpi_os_alloc_memory
  x86/numa: vmap the pages for memnodemap
  x86/srat: vmap the pages for acpi_slit
  x86: map/unmap pages in restore_all_guests.
  x86/pv: rewrite how building PV dom0 handles domheap mappings
  x86/mapcache: initialise the mapcache for the idle domain
  x86: add a boot option to enable and disable the direct map
  x86/domain_page: remove the fast paths when mfn is not in the
    directmap
  xen/page_alloc: add a path for xenheap when there is no direct map
  x86/setup: leave early boot slightly earlier
  x86/setup: vmap heap nodes when they are outside the direct map
  x86/setup: do not create valid mappings when directmap=no

Wei Liu (4):
  x86/setup: move vm_init() before acpi calls
  x86/pv: domheap pages should be mapped while relocating initrd
  x86: add Persistent Map (PMAP) infrastructure
  x86: lift mapcache variable to the arch level

 docs/misc/xen-command-line.pandoc |  12 +++
 xen/arch/arm/setup.c              |   4 +-
 xen/arch/x86/Makefile             |   1 +
 xen/arch/x86/domain.c             |   4 +-
 xen/arch/x86/domain_page.c        |  53 ++++++++-----
 xen/arch/x86/mm.c                 |   8 +-
 xen/arch/x86/numa.c               |   8 +-
 xen/arch/x86/pmap.c               |  87 +++++++++++++++++++++
 xen/arch/x86/pv/dom0_build.c      |  75 ++++++++++++++----
 xen/arch/x86/setup.c              | 125 +++++++++++++++++++++++++-----
 xen/arch/x86/srat.c               |   3 +-
 xen/arch/x86/x86_64/entry.S       |  27 ++++++-
 xen/common/page_alloc.c           |  85 +++++++++++++++++---
 xen/common/vmap.c                 |  37 +++++++--
 xen/drivers/acpi/osl.c            |   9 ++-
 xen/include/asm-arm/mm.h          |   5 ++
 xen/include/asm-x86/domain.h      |  12 +--
 xen/include/asm-x86/fixmap.h      |   3 +
 xen/include/asm-x86/mm.h          |  17 +++-
 xen/include/asm-x86/pmap.h        |  10 +++
 xen/include/xen/vmap.h            |   5 ++
 21 files changed, 495 insertions(+), 95 deletions(-)
 create mode 100644 xen/arch/x86/pmap.c
 create mode 100644 xen/include/asm-x86/pmap.h

-- 
2.24.1.AMZN