[Xen-devel] [PATCH 0/6] IOMMU, vtd and iotlb flush rework (v4)

[Jean Guyader <jean.guyader@xxxxxxxxxxxxx>]

In one of my previous email I detailed a bug I was seeing when passing
through a Intel GPU on a guest that has more that 4G or RAM.

Allen suggested that I go for the Plan B but after a discussion with Tim
we agreed that Plan B was way to disruptive in term of code change.

This patch series implements Plan A.

http://xen.1045712.n5.nabble.com/VTD-Intel-iommu-IOTLB-flush-really-slow-td4952866.html

Changes between v3 and v4:
        - Move the loop for gmfn_range from arch_memory_op to 
xenmem_add_to_physmap.
        - Add a comment to comment to explain the purpose of 
iommu_dont_flush_iotlb.

Changes between v2 and v3:
       - Check for the presence iotlb_flush_all callback before calling it.

Changes between v1 and v2:
      - Move size in struct xen_add_to_physmap in padding between .domid and 
.space.
      - Store iommu_dont_flush per cpu
      - Change the code in hvmloader to relocate by batch of 64K, .size is now 
16 bits.


 tools/firmware/hvmloader/pci.c      |   20 +++++--
 xen/arch/x86/mm.c                   |   82 ++++++++++++++++++++++------
 xen/arch/x86/x86_64/compat/mm.c     |    4 ++
 xen/drivers/passthrough/iommu.c     |   25 +++++++++
 xen/drivers/passthrough/vtd/iommu.c |  100 ++++++++++++++++++++---------------
 xen/include/public/memory.h         |    4 ++
 xen/include/xen/iommu.h             |   17 ++++++
 7 files changed, 186 insertions(+), 66 deletions(-)

Jean Guyader (6):
      vtd: Refactor iotlb flush code
      iommu: Introduce iommu_flush and iommu_flush_all.
      add_to_physmap: Move the code for XENMEM_add_to_physmap.
      mm: New XENMEM space, XENMAPSPACE_gmfn_range
      hvmloader: Change memory relocation loop when overlap with PCI hole.
      Introduce per cpu flag (iommu_dont_flush_iotlb) to avoid unnecessary 
iotlb flush



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