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[Xen-devel] [PATCH 0/3] introduce HVMMEM_ioreq_server mem type

XenGT leverages ioreq server to track and forward the accesses to
GPU I/O resources, e.g. the PPGTT(per-process graphic translation
tables). Currently, ioreq server uses rangeset to track the BDF/
PIO/MMIO ranges to be emulated. To select an ioreq server, the 
rangeset is searched to see if the I/O range is recorded. However,
number of ram pages to be tracked may exceed the upper limit of

Previously, one solution was proposed to refactor the rangeset, and
extend its upper limit. However, after 12 rounds discussion, we have
decided to drop this approach due to security concerns. Now this new
patch series introduces a new mem type, HVMMEM_ioreq_server, and added
hvm operations to let one ioreq server to claim its ownership of ram
pages with this type. Accesses to a page of this type will be handled
by the specified ioreq server directly. 

Yu Zhang (3):
  Add new functions to get/set memory types.
  Rename p2m_mmio_write_dm to p2m_ioreq_server
  Add HVMOP to map guest ram with p2m_ioreq_server to an ioreq server

 xen/arch/x86/hvm/emulate.c       | 118 ++++++++++++-
 xen/arch/x86/hvm/hvm.c           | 372 +++++++++++++++++++++++++--------------
 xen/arch/x86/mm/hap/nested_hap.c |   2 +-
 xen/arch/x86/mm/p2m-ept.c        |   9 +-
 xen/arch/x86/mm/p2m-pt.c         |  25 ++-
 xen/arch/x86/mm/p2m.c            |  79 +++++++++
 xen/arch/x86/mm/shadow/multi.c   |  26 ++-
 xen/include/asm-x86/p2m.h        |  24 ++-
 xen/include/public/hvm/hvm_op.h  |  26 ++-
 9 files changed, 533 insertions(+), 148 deletions(-)


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