[Xen-devel] [PATCH v2 0/3] x86/ioreq server: introduce HVMMEM_ioreq_server mem type

[Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>]

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. 

Changes in v12: 
1> Use p2m_change_entry_type_global() to resync the p2m types, instead of
p2m_memory_type_changed() in last version, cause p2m_memory_type_changed()
only resyncs the memory type in the paging structures other than the p2m
types;
2> Only support the HVMOP_map_mem_type_to_ioreq_server and HVMOP_ioreq_server
for HVMs with HAP enabled;
3> Code corrections according to George Dunlap's comments;
4> Comments added according to George Dunlap's comments.

Yu Zhang (3):
  x86/ioreq server: Add new functions to get/set memory types.
  x86/ioreq server: Rename p2m_mmio_write_dm to p2m_ioreq_server
  x86/ioreq server: Add HVMOP to map guest ram with p2m_ioreq_server to
    an ioreq server

 xen/arch/x86/hvm/emulate.c       | 125 ++++++++++++-
 xen/arch/x86/hvm/hvm.c           | 375 ++++++++++++++++++++++++++-------------
 xen/arch/x86/mm/hap/nested_hap.c |   2 +-
 xen/arch/x86/mm/p2m-ept.c        |  14 +-
 xen/arch/x86/mm/p2m-pt.c         |  25 ++-
 xen/arch/x86/mm/p2m.c            |  82 +++++++++
 xen/arch/x86/mm/shadow/multi.c   |   3 +-
 xen/include/asm-x86/p2m.h        |  38 +++-
 xen/include/public/hvm/hvm_op.h  |  39 +++-
 9 files changed, 554 insertions(+), 149 deletions(-)

-- 
1.9.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel