Re: [Xen-devel] pvh dom0: memory leak from iomem map

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 04.06.14 at 03:29, <mukesh.rathor@xxxxxxxxxx> wrote:
> Hi Tim,
> 
> When building a dom0 pvh, we populate the p2m with 0..N pfns upfront. Then
> in pvh_map_all_iomem, we walk the e820 and map all iomem 1:1. As such
> any iomem range below N would cause those ram frames to be silently dropped. 
> 
> Since the holes could be pretty big, I am concenred this could result
> in significant loss of frames. 
> 
> In my very early patches I had:
> 
> set_typed_p2m_entry():
> ...
>     else if ( p2m_is_ram(ot) )
>     {
>          if ( is_pvh_domain(d) )                    <---
>              free_domheap_page(mfn_to_page(omfn));  <---
> 
>          ASSERT(mfn_valid(omfn));
>          set_gpfn_from_mfn(mfn_x(omfn), INVALID_M2P_ENTRY);
> ..
> 
> I'd like you to reconsider it. Since there is a dislike using is_pvh, 
> I suppose one alternative could be, 'if ( gfn_p2mt == p2m_mmio_direct)'.
> 
> If you have any other suggestions, I'm open to them. LMK your thoughts..

Isn't Roger's af06d66e ("x86: fix setup of PVH Dom0 memory map")
already taking care of this?

Jan


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