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[Xen-devel] [PATCH v6 0/4] x86/ioreq server: 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 rangeset.

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 (4):
  x86/ioreq server: Add HVMOP to map guest ram with p2m_ioreq_server to
    an ioreq server.
  x86/ioreq server: Release the p2m lock after mmio is handled.
  x86/ioreq server: Handle read-modify-write cases for p2m_ioreq_server
  x86/ioreq server: Reset outstanding p2m_ioreq_server entries when an
    ioreq server unmaps.

 xen/arch/x86/hvm/emulate.c       |  71 ++++++++++++++++++++--
 xen/arch/x86/hvm/hvm.c           | 104 ++++++++++++++++++++++++++++++---
 xen/arch/x86/hvm/ioreq.c         |  39 +++++++++++++
 xen/arch/x86/mm/hap/hap.c        |   9 +++
 xen/arch/x86/mm/hap/nested_hap.c |   2 +-
 xen/arch/x86/mm/p2m-ept.c        |  14 ++++-
 xen/arch/x86/mm/p2m-pt.c         |  30 +++++++---
 xen/arch/x86/mm/p2m.c            | 123 +++++++++++++++++++++++++++++++++++++++
 xen/arch/x86/mm/shadow/multi.c   |   3 +-
 xen/include/asm-x86/hvm/ioreq.h  |   2 +
 xen/include/asm-x86/p2m.h        |  35 +++++++++--
 xen/include/public/hvm/hvm_op.h  |  35 ++++++++++-
 12 files changed, 437 insertions(+), 30 deletions(-)


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