Re: [PATCH v4 0/3] x86/ioreq server: Introduce HVMMEM_ioreq_server mem type.

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

Hi Maintainers,

On 5/19/2016 5:05 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 (3):
>    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.
>
>   xen/arch/x86/hvm/emulate.c       |  32 +++-
>   xen/arch/x86/hvm/hvm.c           | 346 +++++++++++++++++++++++++--------------
>   xen/arch/x86/hvm/ioreq.c         |  41 +++++
>   xen/arch/x86/mm/hap/nested_hap.c |   2 +-
>   xen/arch/x86/mm/p2m-ept.c        |   7 +-
>   xen/arch/x86/mm/p2m-pt.c         |  23 ++-
>   xen/arch/x86/mm/p2m.c            |  70 ++++++++
>   xen/arch/x86/mm/shadow/multi.c   |   3 +-
>   xen/include/asm-x86/hvm/ioreq.h  |   2 +
>   xen/include/asm-x86/p2m.h        |  32 +++-
>   xen/include/public/hvm/hvm_op.h  |  38 ++++-
>   11 files changed, 452 insertions(+), 144 deletions(-)
>
Any comment on this version? Sorry for the disturbance.

B.R.
Yu

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