[PATCH 3/7] libxenlight resend: 8mb physmap slack for pv domains

[Andres Lagar-Cavilla <andres@lagarcavilla.com>]

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Contemplate 8MB of slack for PV domains, since they
do ballooning (or flipping network rx) and need
some extra room in their pfn space.

Note that this does not allocate any extra memory
to the domain, it simply extends the physmap with
some extra room for "bounce bufffering back" pfn's
that are yielded to dom0.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.com>


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# HG changeset patch
# User Andres Lagar-Cavilla <andres@lagarcavilla.com>
# Date 1259252810 18000
# Node ID ac2ad391d9290a5c554c9b809a6a23bb73aa25a2
# Parent  f5f07c0161eef51c265a1d0acbdf7da84cfc0fef
Contemplate 8MB of slack for PV domains, since they
do ballooning (or flipping network rx) and need
some extra room in their pfn space.

Note that this does not allocate any extra memory 
to the domain, it simply extends the physmap with
some extra room for "bounce bufffering back" pfn's 
that are yielded to dom0.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.com> 

diff -r f5f07c0161ee -r ac2ad391d929 libxl_dom.c
--- a/libxl_dom.c
+++ b/libxl_dom.c
@@ -53,7 +53,8 @@ int build_pre(struct libxl_ctx *ctx, uin
         xc_set_hvm_param(ctx->xch, domid, HVM_PARAM_VPT_ALIGN, (unsigned long) info->vpt_align);
     xc_domain_max_vcpus(ctx->xch, domid, info->max_vcpus);
     xc_domain_setmaxmem(ctx->xch, domid, info->max_memkb + info->video_memkb);
-    xc_domain_set_memmap_limit(ctx->xch, domid, info->max_memkb);
+    xc_domain_set_memmap_limit(ctx->xch, domid, 
+            (info->hvm) ? info->max_memkb : (info->max_memkb + (8*1024)));
 
     if (info->hvm) {
         unsigned long shadow;

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