Re: [Xen-devel] [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 01.08.14 at 11:50, <tiejun.chen@xxxxxxxxx> wrote:
> On 2014/8/1 15:21, Jan Beulich wrote:
>>>>> On 01.08.14 at 09:10, <tiejun.chen@xxxxxxxxx> wrote:
>>> On 2014/8/1 14:51, Jan Beulich wrote:
>>>>>>> On 31.07.14 at 11:45, <tiejun.chen@xxxxxxxxx> wrote:
>>>>> Additionally, I'm trying to figure out that solution. As I mentioned
>>>>> previously, I think we can reserve all RMRR once when a guest call
>>>>> XENMEM_machine_memory_map to create its own memory. What about this
>>>>> idea? Or other better suggestions?
>>>>
>>>> I don't think any HVM guest would ever call this, even more so that
>>>> the call is restricted to Dom0. The reservation needs to be done
>>>
>>> Thanks for your correction. Actually I'm also afraid I may not find a
>>> correct place where I want to go indeed since I'm not familiar this
>>> process.
>>>
>>>> when guest memory gets populated (and its E820 constructed).
>>>
>>> Could you hint me where this action is covered?
>>
>> Memory population happens in tools/libxc/xc_hvm_build.c:setup_guest(),
>> the E820 for the guest gets constructed in hvmloader (just grep for
>> [eE]820).
>>
> 
> Thanks for your information.
> 
> With further looking into this, instead of XENMEM_machine_memory_map, I 
> think we can go XENMEM_set_memory_map path, right?

I'm not sure - this may be an additional piece to be done for
consistency (if the domain builder doesn't already call this), but
since hvmloader doesn't appear to call XENMEM_memory_map it
won't do on its own I'm afraid.

Jan


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