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[kernel,v4,0/2] KVM: PPC: Check if IOMMU page is contained in the pinned physical page

Message ID 20180705080133.18690-1-aik@ozlabs.ru (mailing list archive)
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Series KVM: PPC: Check if IOMMU page is contained in the pinned physical page | expand

Message

Alexey Kardashevskiy July 5, 2018, 8:01 a.m. UTC 
This is to improve page boundaries checking and should probably
be cc:stable. I came accross this while debugging nvlink2 passthrough
but the lack of checking might be exploited by the existing userspace.

Changes:
v4:
* 2/2: implemented less strict but still safe max pageshift as David suggested

v3:
* enforced huge pages not to cross preregistered chunk boundaries

v2:
* 2/2: explicitly check for compound pages before calling compound_order()


This is based on sha1
021c917 Linus Torvalds "Linux 4.18-rc3".

Please comment. Thanks.



Alexey Kardashevskiy (2):
  vfio/spapr: Use IOMMU pageshift rather than pagesize
  KVM: PPC: Check if IOMMU page is contained in the pinned physical page

 arch/powerpc/include/asm/mmu_context.h |  4 ++--
 arch/powerpc/kvm/book3s_64_vio.c       |  2 +-
 arch/powerpc/kvm/book3s_64_vio_hv.c    |  6 ++++--
 arch/powerpc/mm/mmu_context_iommu.c    | 23 ++++++++++++++++++++---
 drivers/vfio/vfio_iommu_spapr_tce.c    | 10 +++++-----
 5 files changed, 32 insertions(+), 13 deletions(-)