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Subject[PATCH v5 0/6] introduce GNTTABOP_cache_flush
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.

v5 introduces is_dma_coherent as a Xen specific utility function named
xen_is_dma_coherent. However in the future we are going to re-work it as
a proper common arch/arm (and arch/arm64) function.

Changes in v5:
- introduce xen_is_dma_coherent as a xen specific function;
- call xen_is_dma_coherent instead of is_dma_coherent;
- introduce xen_is_dma_coherent to
- do not remove arch/arm64/include/asm/xen/page-coherent.h, add
the missing dma_ops calls from it;
- fix indentation;
- rename hypercall_flush to hypercall_cflush;
- remove spurious change.

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 (6):
xen/arm: remove handling of XENFEAT_grant_map_identity
xen/arm: remove outer_*_range call
xen/arm: introduce xen_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/xen/page-coherent.h | 5 +
arch/arm/include/asm/xen/page.h | 4 +
arch/arm/xen/Makefile | 2 +-
arch/arm/xen/enlighten.c | 5 -
arch/arm/xen/mm.c | 160 ++++++++++++++++++++++
arch/arm/xen/mm32.c | 202 ----------------------------
arch/arm64/include/asm/xen/page-coherent.h | 25 ++--
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 +++
11 files changed, 213 insertions(+), 224 deletions(-)
delete mode 100644 arch/arm/xen/mm32.c

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