From: Ian Campbell <ian.campbell@citrix.com>
Date: Thu, 1 Mar 2012 12:26:14 +0000 (+0000)
Subject: libxl: drop 8M slack for PV guests.
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=aef7f7836d44949020536fa252d1faa1fe7481e1;p=xen.git

libxl: drop 8M slack for PV guests.

This serves no purpose. It relates to the old 8M to "account for backend
allocations" which we used to add. This leaves a bit of unpopulated space in
the Pseudo-physical address space which can be used by backends when mapping
foreign memory. However 8M is not representative of that any more and modern
kernels do not operate in this way anyway.

I suspect an argument could be made for removing this from the libxl API
altogether but instead lets just set the overhead to 0.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
---

diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 62a46c00ea..fc995fc98c 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -108,7 +108,7 @@ void libxl_domain_build_info_init(libxl_domain_build_info *b_info,
         b_info->u.hvm.xen_platform_pci = 1;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
-        b_info->u.pv.slack_memkb = 8 * 1024;
+        b_info->u.pv.slack_memkb = 0;
         break;
     default:
         abort();