[Xen-devel] [PATCH 0/7] IOMMU, vtd and iotlb flush rework (v6)

[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 v5 and v6:
        - Rework the patch queue to make it more readable.
        - Modify xatp in place in xenmem_add_to_physmap
        - Only check for preemption if we are not at the last iteration
        - Copy xatp guest handler back to the guest only in case of continuation
        - Add continuation only when dealing with the new xenmem space
          (XENMAPSPACE_gmfn_range).

Changes between v4 and v5:
        - Fix hypercall continuation for add_to_physmap in compat mode.

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.


Jean Guyader (7):
  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: xenmem_add_to_physmap now takes a pointer on xatp
  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

 tools/firmware/hvmloader/pci.c      |   20 ++-
 xen/arch/x86/mm.c                   |  232 ++++++++++++++++++++++-------------
 xen/arch/x86/x86_64/compat/mm.c     |   12 ++
 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, 278 insertions(+), 132 deletions(-)

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