[Xen-devel] [BUGFIX][PATCH 0/4] gdbsx: fix 3 bugs

[Don Slutz <dslutz@xxxxxxxxxxx>]

Release manager requests:
  patch 1 should be in 4.4.0
  patch 3 and 4 would be good to be in 4.4.0
  patch 2 is optional.

While tracking down a bug in seabios/grub I found the bug in patch
1.

There are 2 ways that gfn will not be INVALID_GFN and yet mfn will
be INVALID_MFN.

  1) p2m_is_readonly(gfntype) and writing memory.
  2) the requested vaddr does not exist.

This may only be an issue for a HVM guest that is in real mode
(I.E. no page tables).

Patch 2 is debug logging that was used to find the 2nd way.

Patch 3 and 4 are more of a cleanup bug fix.

Don Slutz (4):
  dbg_rw_guest_mem: need to call put_gfn in error path.
  dbg_rw_guest_mem: Enable debug log output
  xg_read_mem: Report on error.
  XEN_DOMCTL_gdbsx_guestmemio: always do the copyback.

 tools/debugger/gdbsx/xg/xg_main.c |  6 ++++--
 xen/arch/x86/debug.c              | 44 ++++++++++++++++++++++++++++++---------
 xen/arch/x86/domctl.c             |  3 +--
 3 files changed, 39 insertions(+), 14 deletions(-)

-- 
1.8.4


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