[Xen-devel] [PATCH 0/2] XSA-171 Followup work

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

Investigating XSA-171 highlighted how useless the viopl interface for PV
guests actually is.  The value can only be set; it can't be queried, and will
go wrong if a 64bit guest kernel programs it with the cpl found in its
exception frames.

Introduce a better alternative.

Andrew Cooper (2):
  xen/x86: Don't hold TRAPBOUNCE_flags in %cl during create_bounce_frame
  xen/x86: Introduce a new VMASSIST for architectural behaviour of iopl

 xen/arch/x86/domain.c              | 10 +++++++---
 xen/arch/x86/physdev.c             |  2 +-
 xen/arch/x86/traps.c               |  8 ++++++--
 xen/arch/x86/x86_64/asm-offsets.c  |  3 +++
 xen/arch/x86/x86_64/compat/entry.S | 12 ++++++++----
 xen/arch/x86/x86_64/compat/traps.c |  4 ++++
 xen/arch/x86/x86_64/entry.S        | 12 ++++++++----
 xen/arch/x86/x86_64/traps.c        |  3 +++
 xen/include/asm-x86/config.h       |  1 +
 xen/include/asm-x86/domain.h       |  3 ++-
 xen/include/public/xen.h           |  8 ++++++++
 11 files changed, 51 insertions(+), 15 deletions(-)

-- 
2.1.4


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