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

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

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
>      pages.
>    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.

Thanks
Yu

Yu

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