Re: [Xen-devel] [edk2-devel] [PATCH v4 33/35] OvmfPkg: Introduce XenIoPvhDxe to initialize Grant Tables

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Jul 29, 2019 at 04:39:42PM +0100, Anthony PERARD wrote:
> XenIoPvhDxe use XenIoMmioLib to reserve some space to be use by the
> Grant Tables.
> 
> The call is only done if it is necessary, we simply detect if the
> guest is PVH, as in this case there is currently no PCI bus, and no
> PCI Xen platform device which would start the XenIoPciDxe and allocate
> the space for the Grant Tables.

Since I'm not familiar with OVMF code, where is the grant table
physical memory coming from then, is it allocated from a hole in the
memory map?

Thanks, Roger.

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