From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH RFC 04/18] OvmfPkg/XenbusDxe: Add support to
 make Xen Hypercalls.
Date: Wed, 16 Jul 2014 13:37:05 -0400
Message-ID: <20140716173705.GF30483@laptop.dumpdata.com>
References: <1405523747-5024-1-git-send-email-anthony.perard@citrix.com>
	<1405523747-5024-5-git-send-email-anthony.perard@citrix.com>
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To: Anthony PERARD <anthony.perard@citrix.com>
Cc: EDK2 devel <edk2-devel@lists.sourceforge.net>, Xen Devel <xen-devel@lists.xen.org>
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> diff --git a/OvmfPkg/XenbusDxe/XenHypercall.c b/OvmfPkg/XenbusDxe/XenHypercall.c
> new file mode 100644
> index 0000000..5e98dd5
> --- /dev/null
> +++ b/OvmfPkg/XenbusDxe/XenHypercall.c
> @@ -0,0 +1,101 @@
> +#include <PiDxe.h>
> +#include <Library/HobLib.h>
> +#include <Guid/XenInfo.h>
> +
> +#include "XenbusDxe.h"
> +#include "XenHypercall.h"
> +
> +#include <IndustryStandard/Xen/hvm/params.h>
> +#include <IndustryStandard/Xen/memory.h>
> +
> +EFI_STATUS
> +XenHyperpageInit (
> +  XENBUS_DEVICE *Dev
> +  )
> +{
> +  EFI_HOB_GUID_TYPE   *GuidHob;
> +  EFI_XEN_INFO        *XenInfo;
> +
> +  GuidHob = GetFirstGuidHob (&gEfiXenInfoGuid);
> +  if (GuidHob == NULL) {
> +    DEBUG ((EFI_D_INFO, "XenbusInit: No xeninfo ?\n"));
> +    return EFI_NOT_FOUND;
> +  }
> +  XenInfo = (EFI_XEN_INFO*)GET_GUID_HOB_DATA (GuidHob);
> +  Dev->Hyperpage = XenInfo->HyperPages;
> +  return EFI_SUCCESS;
> +}

Could you describe in the git commit a bit on how/where in hvmloader
this EfiXenInfoGuid is set and how the OVMF gets a handle on it?

Thank you.