[Xen-changelog] [xen-unstable] x86: make max_mfn returned from XENMEM_machphys_mapping dynamic

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1265273629 0
# Node ID d311d1efc25e3d270c0b7f14bd4d43bbfbcb35dd
# Parent  91358472d8c40b25ac0704c2c1c3d86515952a22
x86: make max_mfn returned from XENMEM_machphys_mapping dynamic

This helps debugging in the guest kernels, as then MFNs there can then
be range checked based on the reported value.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/arch/x86/mm.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff -r 91358472d8c4 -r d311d1efc25e xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c Thu Feb 04 08:53:16 2010 +0000
+++ b/xen/arch/x86/mm.c Thu Feb 04 08:53:49 2010 +0000
@@ -4456,12 +4456,14 @@ long arch_memory_op(int op, XEN_GUEST_HA
 
     case XENMEM_machphys_mapping:
     {
-        static const struct xen_machphys_mapping mapping = {
+        struct xen_machphys_mapping mapping = {
             .v_start = MACH2PHYS_VIRT_START,
             .v_end   = MACH2PHYS_VIRT_END,
             .max_mfn = MACH2PHYS_NR_ENTRIES - 1
         };
 
+        if ( !mem_hotplug )
+            mapping.max_mfn = max_page - 1;
         if ( copy_to_guest(arg, &mapping, 1) )
             return -EFAULT;
 

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