Re: [PATCH v5 0/4] x86/ioreq server: Introduce HVMMEM_ioreq_server mem type.

[Yu Zhang <yu.c.zhang@linux.intel.com>]

On 7/12/2016 5:02 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: Rename p2m_mmio_write_dm to p2m_ioreq_server.
>    x86/ioreq server: Add new functions to get/set memory types.
>    x86/ioreq server: Add HVMOP to map guest ram with p2m_ioreq_server to
>      an ioreq server.
>    x86/ioreq server: Reset outstanding p2m_ioreq_server entries when an
>      ioreq server unmaps.
>
>   xen/arch/x86/hvm/emulate.c       |  33 +++-
>   xen/arch/x86/hvm/hvm.c           | 395 ++++++++++++++++++++++++++-------------
>   xen/arch/x86/hvm/ioreq.c         |  41 ++++
>   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            |  77 ++++++++
>   xen/arch/x86/mm/shadow/multi.c   |   3 +-
>   xen/include/asm-x86/hvm/ioreq.h  |   2 +
>   xen/include/asm-x86/p2m.h        |  36 +++-
>   xen/include/public/hvm/hvm_op.h  |  34 +++-
>   12 files changed, 528 insertions(+), 148 deletions(-)
>

Hi Jan & George, any comments on this version? :)
Sorry if this mail disturbs, but it has been more than 3 weeks since the 
post...

Thanks
Yu




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