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Re: [for-4.15][PATCH v4 0/2] xen/iommu: Collection of bug fixes for IOMMU teardown

Hi all,

Please ignore this version. I forgot to CC the maintainers on it. I will resend a new series.


On 23/02/2021 12:34, Julien Grall wrote:
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 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.


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

Julien Grall (2):
   xen/x86: iommu: Ignore IOMMU mapping requests when a domain is dying
   xen/iommu: x86: Clear the root page-table before freeing the

  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(-)

Julien Grall



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