[Xen-changelog] [xen-unstable] Avoid passing uninitialised ACPI tables to dom0 when checksums fail.

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

# HG changeset patch
# User Keir Fraser <keir@xxxxxxxxxxxxx>
# Date 1192812432 -3600
# Node ID 975811798ffef918968d8594ac6d0017c7cc5ab1
# Parent  959b4b92b6bfc127eea48ad9b94564a522803fbe
Avoid passing uninitialised ACPI tables to dom0 when checksums fail.

If during boot, ACPI checksum failures disable ACPI support in Xen,
pass 'acpi=off' to the domain 0 kernel to avoid a fatal page fault
as domain 0 attempts to access the uninitialized ACPI tables.

Signed-off-by: David Lively <dlively@xxxxxxxxxxxxxxx>
Signed-off-by: Steve Ofsthun <sofsthun@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/setup.c |    5 +++++
 1 files changed, 5 insertions(+)

diff -r 959b4b92b6bf -r 975811798ffe xen/arch/x86/setup.c
--- a/xen/arch/x86/setup.c      Fri Oct 19 17:44:20 2007 +0100
+++ b/xen/arch/x86/setup.c      Fri Oct 19 17:47:12 2007 +0100
@@ -972,6 +972,11 @@ void __init __start_xen(unsigned long mb
         if ( acpi_skip_timer_override &&
              !strstr(dom0_cmdline, "acpi_skip_timer_override") )
             safe_strcat(dom0_cmdline, " acpi_skip_timer_override");
+        if ( (strlen(acpi_param) == 0) && acpi_disabled )
+        {
+            printk("ACPI is disabled, notifying Domain 0 (acpi=off)\n");
+            safe_strcpy(acpi_param, "off");
+        }
         if ( (strlen(acpi_param) != 0) && !strstr(dom0_cmdline, "acpi=") )
         {
             safe_strcat(dom0_cmdline, " acpi=");

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