[PATCH] boot with default on dom0_mem allocation failure.

[INAKOSHI Hiroya <inakoshi.hiroya@jp.fujitsu.com>]

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Hi,

this patch makes Xen boot with the default dom0_mem value when the given
value exceeds available memory, instead Xen panics and reboots.

Administrators have a chance to correct dom0_mem (and other parameters
if necessary) after Xen is up with default, seeing the warning message.

Tested by booting Domain-0.

Signed-off-by: Hiroya INAKOSHI <inakoshi.hiroya@jp.fujitsu.com>



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diff -r f790546ecfda xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c	Mon Aug 28 20:22:56 2006 +0100
+++ b/xen/arch/x86/domain_build.c	Thu Aug 31 16:48:55 2006 +0900
@@ -267,6 +267,12 @@ int construct_dom0(struct domain *d,
     printk("*** LOADING DOMAIN 0 ***\n");
 
     d->max_pages = ~0U;
+
+    if ( dom0_nrpages > (avail_domheap_pages() + initial_images_nrpages()) )
+    {
+        printk("Warning: dom0_mem exceed available memory. Booting with default.\n");
+        dom0_nrpages = 0;
+    }
 
     /*
      * If domain 0 allocation isn't specified, reserve 1/16th of available

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