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Re: [Xen-devel] [PATCH v6 0/4] x86/ioreq server: Introduce HVMMEM_ioreq_server mem type.

On 9/2/2016 6:47 PM, Yu Zhang wrote:
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(-)

Hi maintainers,

Sorry, I just realized that you have already commented all these patches yesterday. But it's strange that my thunderbird failed to receive most mails from xen-devel yesterday(Sep 5), though it works fine today. I just saw your reply in the web archive, and can not reply to you. And even accesses to the web archive have connection
failures now and then.

Seems my colleagues here also met this issue, and I'll try to contact the IT to see if
we can fix this.



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