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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.08.16 at 04:44, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:

> 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...

I've been on vacation up until the end of last week, and as you may
have seen I did push the first two patches yesterday. The other
two aren't forgotten. Otoh I'm not entirely certain it makes sense
to apply the new hvmop one ahead of the hvmctl (or dmop, or
whatever is going to evolve out of this) series, as that would mean
a fair part of the newly added code to get moved elsewhere pretty
soon afterwards.

Jan


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