[Xen-devel] xenU kernel doesn't start in unstable

[Rik van Riel <riel@xxxxxxxxxx>]

The xenU kernel in current -unstable tree seems to crash after
bootup, having used just 0.1 seconds of CPU time:

# xm create kernel=/tmp/vmlinuz
Using config file "/etc/xen/xmdefconfig".
Started domain TestDomain, console on port 9640
# xm list
Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Domain-0           0      170    0  r----    817.2
TestDomain        40       32    0  ----c      0.1    9640

This is with the xenU_defconfig from the xen bk tree, though
the same crash has also been observed with the Fedora rawhide
kernel.

One place where the system crashes is at dmi scan time, because
__ioremap() is a "return NULL" when CONFIG_XEN_PHYSDEV_ACCESS is
not defined, which makes dmi_iterate's memcpy follow a NULL
pointer.

The next xenU crash seems to be in parse_args - no idea what's
causing that, or why xen0 seems to be working fine ...

--- arch/xen/i386/kernel/dmi_scan.c.orig        2005-01-12 14:55:14.000000000 
-0500
+++ arch/xen/i386/kernel/dmi_scan.c     2005-01-12 16:06:27.000000000 -0500
@@ -105,6 +105,8 @@
        char __iomem *p, *q;

        for (p = q = ioremap(0xF0000, 0x10000); q < p + 0x10000; q += 16) {
+               if (p == NULL)
+                       return -1;
                memcpy_fromio(buf, q, 15);
                if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf))
                {


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