[PATCH for-4.15 v5 0/3] xen/iommu: Collection of bug fixes for IOMMU teardown

[Julien Grall <julien@xxxxxxx>]

From: Julien Grall <jgrall@xxxxxxxxxx>

Hi all,

This series is a collection of bug fixes for the IOMMU teardown code.
All of them are candidate for 4.15 as they can either leak memory or
lead to host crash/host corruption.

This is sent directly on xen-devel because all the issues were either
introduced in 4.15 or happen in the domain creation code.

Major changes since v4:
    - New patch added (it is a split of patch #1 in v4)

Major changes since v3:
    - Remove patch #3 "xen/iommu: x86: Harden the IOMMU page-table
    allocator" as it is not strictly necessary for 4.15.
    - Re-order the patches to avoid on a follow-up patch to fix
    completely the issue.

Major changes since v2:
    - patch #1 "xen/x86: p2m: Don't map the special pages in the IOMMU
    page-tables" has been removed. This requires Jan's patch [1] to
    fully mitigate memory leaks.

Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>

@Ian, I assumed that the release-acked-by would stand even with the
patch split. Let me know if if this is not the case.

Cheers,

[1] <90271e69-c07e-a32c-5531-a79b10ef03dd@xxxxxxxx>

Julien Grall (3):
  xen/iommu: x86: Don't try to free page tables is the IOMMU is not
    enabled
  xen/x86: iommu: Ignore IOMMU mapping requests when a domain is dying
  xen/iommu: x86: Clear the root page-table before freeing the
    page-tables

 xen/drivers/passthrough/amd/iommu_map.c     | 12 +++++++++++
 xen/drivers/passthrough/amd/pci_amd_iommu.c | 12 ++++++++++-
 xen/drivers/passthrough/vtd/iommu.c         | 24 ++++++++++++++++++++-
 xen/drivers/passthrough/x86/iommu.c         | 19 ++++++++++++++++
 xen/include/xen/iommu.h                     |  1 +
 5 files changed, 66 insertions(+), 2 deletions(-)

-- 
2.17.1