Re: [Xen-devel] question about xl migrate

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 17/05/16 10:01, Zhang, Chunyu wrote:
> hi all
>
> i have two question about xl migrate
>
> write_batch
> 120     for ( i = 0; i < nr_pfns; ++i )
> 121     {
> 122         types[i] = mfns[i] = ctx->save.ops.pfn_to_gfn(ctx,
> 123                                                       
> ctx->save.batch_pfns[i]);
> 124 
> 125         /* Likely a ballooned page. */
> 126         if ( mfns[i] == INVALID_MFN )
> 127         {
> 128             set_bit(ctx->save.batch_pfns[i], ctx->save.deferred_pages);
> 129             ++ctx->save.nr_deferred_pages;
> 130         }
> 131     }
>
> 1.  line 122
> in hvm mode, is not mfns, but gfns.
> right?

Correct.  The array should be named "gfns" rather than "mfns", which is
the appropriate term for both PV and HVM guests.

>
> 2. line 125
> in hvm mode,would not be a balloon page.
> gfn would not be INVALID_MFN.
> mfn would be INVALID_MFN.
> right?

I don't understand what you asking here.

~Andrew

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