[PATCH v4 0/7] introduce GNTTABOP_cache_flush

[Stefano Stabellini]

Hi all,
this patch series introduces support for GNTTABOP_cache_flush to perform
cache maintenance operation on foreign pages and reverts the current
code based on XENFEAT_grant_map_identity.

It also provides a very slow fallback by bouncing on the swiotlb buffer,
in case the hypercall is not available.


Changes in v4:
- remove outer_*_range call;
- introduce is_dma_coherent;
- use is_dma_coherent in arch/arm/xen/mm32.c;
- merge xen/mm32.c into xen/mm.c;
- xen/arm/arm64: introduce xen_arch_need_swiotlb;
- avoid bouncing dma map operations that involve foreign grants and
non-coherent devices if GNTTABOP_cache_flush is provided by Xen.

Changes in v3:
- fix the cache maintenance op call to match what Linux does natively;
- update the hypercall interface to match Xen.

Changes in v2:
- remove the definition of XENFEAT_grant_map_identity;
- update the hypercall interface to match Xen;
- call the interface on a single page at a time.


Stefano Stabellini (7):
      xen/arm: remove handling of XENFEAT_grant_map_identity
      xen/arm: remove outer_*_range call
      [RFC] arm/arm64: introduce is_dma_coherent
      xen/arm: use is_dma_coherent
      xen/arm/arm64: merge xen/mm32.c into xen/mm.c
      xen/arm/arm64: introduce xen_arch_need_swiotlb
      xen/arm: introduce GNTTABOP_cache_flush

 arch/arm/include/asm/dma-mapping.h         |    6 +
 arch/arm/include/asm/xen/page.h            |    4 +
 arch/arm/xen/Makefile                      |    2 +-
 arch/arm/xen/enlighten.c                   |    5 -
 arch/arm/xen/mm.c                          |  161 +++++++++++++++++++++-
 arch/arm/xen/mm32.c                        |  202 ----------------------------
 arch/arm64/include/asm/dma-mapping.h       |    5 +
 arch/arm64/include/asm/xen/page-coherent.h |   44 +-----
 arch/x86/include/asm/xen/page.h            |    7 +
 drivers/xen/swiotlb-xen.c                  |    5 +-
 include/xen/interface/features.h           |    3 -
 include/xen/interface/grant_table.h        |   19 +++
 12 files changed, 207 insertions(+), 256 deletions(-)
 delete mode 100644 arch/arm/xen/mm32.c