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Re: [Xen-devel] [PATCH] Don't track all memory when enabling log dirty to track vram

>>> On 26.05.14 at 10:16, <yang.z.zhang@xxxxxxxxx> wrote:
> Jan Beulich wrote on 2014-05-23:
>>>>> On 21.05.14 at 10:37, <yang.z.zhang@xxxxxxxxx> wrote:
>>> Jan Beulich wrote on 2014-05-21:
>>>> You didn't in any way negate the condition of superpage support to
>>>> be added post-4.4 in order for your other change to go in: Neither
>>>> http://lists.xenproject.org/archives/html/xen-devel/2014-02/msg01230.
>>>> html
>>>>  nor
>>>> http://lists.xenproject.org/archives/html/xen-devel/2014-02/msg01236.
>>>> html  have been responded to by you. By not doing so, to me at
>>>> least you implicitly accepted the condition. And by now refusing to
>>>> meet it, you basically tell us that we shouldn't be doing
>>>> compromises like this with you in the future.
>>> I have said before I am totally unware of it. And I know it only two
>>> days ago after someone told me. So please do not confuse this with
>>> the thing what we are discussing now. If you think I gave a promise
>>> implicitly at that time, I am sorry to let you think so.
>>> As I said in previous thread, if we can prove that add hugepage for
>>> the separate VT-d page table is the only choice to solve problem,
>>> then now I am promising that I will do it ASAP. But till now, I
>>> didn't see any point that we must to have it. To me, it is still a nice to 
> have feature.
>> Btw., I think I just spotted a second thing not working without split page 
> tables:
>> mem-access (which doesn't and imo shouldn't depend on !need_iommu(),
>> other than mem-sharing and mem-paging) likewise has the potential of
>> creating entries resulting in IOMMU faults.
> I don't know what mem-access is? Do you mean Xenaccess? If not, can you 
> elaborate it or provide a link to help me to understand how it works?

The (example) tool indeed is named xen-access. See XENMEM_access_op
(used to be HVMOP_{get,set}_mem_access).


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