Re: [Xen-devel] One question about the hypercall to translate gfn to mfn.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.12.14 at 11:10, <yu.c.zhang@xxxxxxxxxxxxxxx> wrote:
>    As you can see, we are pushing our XenGT patches to the upstream. One 
> feature we need in xen is to translate guests' gfn to mfn in XenGT dom0 
> device model.
> 
>    Here we may have 2 similar solutions:
>    1> Paul told me(and thank you, Paul :)) that there used to be a 
> hypercall, XENMEM_translate_gpfn_list, which was removed by Keir in 
> commit 2d2f7977a052e655db6748be5dabf5a58f5c5e32, because there was no 
> usage at that time. So solution 1 is to revert this commit. However, 
> since this hypercall was removed ages ago, the reverting met many 
> conflicts, i.e. the gmfn_to_mfn is no longer used in x86, etc.
> 
>    2> In our project, we defined a new hypercall 
> XENMEM_get_mfn_from_pfn, which has a similar implementation like the 
> previous XENMEM_translate_gpfn_list. One of the major differences is 
> that this newly defined one is only for x86(called in arch_memory_op), 
> so we do not have to worry about the arm side.
> 
>    Does anyone has any suggestions about this?

Out of the two 1 seems preferable. But without background (see also
Paul's reply) it's hard to tell whether that's what you want/need.

Jan


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