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[Xen-devel] [PATCH] x86: make max_mfn returned from XENMEM_machphys_mapp
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|---|---|
| Subject: | [Xen-devel] [PATCH] x86: make max_mfn returned from XENMEM_machphys_mapping dynamic |
| From: | "Jan Beulich" <JBeulich@xxxxxxxxxx> |
| Date: | Wed, 03 Feb 2010 13:14:17 +0000 |
| Delivery-date: | Wed, 03 Feb 2010 05:14:03 -0800 |
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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>
--- 2010-01-27.orig/xen/arch/x86/mm.c 2010-01-06 11:22:26.000000000 +0100
+++ 2010-01-27/xen/arch/x86/mm.c 2010-02-03 13:29:46.000000000 +0100
@@ -4457,12 +4457,14 @@ 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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