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

Roger Pau Monné
 

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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