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Date: Wed, 7 Aug 2019 18:07:03 +0200
From: =?UTF-8?B?Um9nZXIgUGF1IE1vbm7DqQ==?= <roger.pau@citrix.com>
To: <devel@edk2.groups.io>, <anthony.perard@citrix.com>
CC: Julien Grall <julien.grall@arm.com>, <xen-devel@lists.xenproject.org>,
	Jordan Justen <jordan.l.justen@intel.com>, Ard Biesheuvel
	<ard.biesheuvel@linaro.org>, Laszlo Ersek <lersek@redhat.com>
Subject: Re: [edk2-devel] [PATCH v4 33/35] OvmfPkg: Introduce XenIoPvhDxe to initialize Grant Tables
Message-ID: <20190807160703.2hkbpyvodevuwuhz@Air-de-Roger>
References: <20190729153944.24239-1-anthony.perard@citrix.com>
 <20190729153944.24239-34-anthony.perard@citrix.com>
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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.