From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
[S390] nss: disable kexec.
nss and kexec don't work together since kexec wants to write to the
read-only text section of the shared kernel image.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---
arch/s390/Kconfig | 2 ++
arch/s390/kernel/machine_kexec.c | 5 +++++
2 files changed, 7 insertions(+)
diff -urpN linux-2.6/arch/s390/Kconfig linux-2.6-patched/arch/s390/Kconfig
--- linux-2.6/arch/s390/Kconfig 2007-03-05 22:51:29.000000000 +0100
+++ linux-2.6-patched/arch/s390/Kconfig 2007-03-05 22:51:50.000000000 +0100
@@ -376,6 +376,8 @@ config SHARED_KERNEL
Select this option, if you want to share the text segment of the
Linux kernel between different VM guests. This reduces memory
usage with lots of guests but greatly increases kernel size.
+ Also if a kernel was IPL'ed from a shared segment the kexec system
+ call will not work.
You should only select this option if you know what you are
doing and want to exploit this feature.
diff -urpN linux-2.6/arch/s390/kernel/machine_kexec.c linux-2.6-patched/arch/s390/kernel/machine_kexec.c
--- linux-2.6/arch/s390/kernel/machine_kexec.c 2007-03-05 22:51:29.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/machine_kexec.c 2007-03-05 22:51:50.000000000 +0100
@@ -19,6 +19,7 @@
#include <asm/system.h>
#include <asm/smp.h>
#include <asm/reset.h>
+#include <asm/ipl.h>
typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
@@ -29,6 +30,10 @@ int machine_kexec_prepare(struct kimage
{
void *reboot_code_buffer;
+ /* Can't replace kernel image since it is read-only. */
+ if (ipl_flags & IPL_NSS_VALID)
+ return -ENOSYS;
+
/* We don't support anything but the default image type for now. */
if (image->type != KEXEC_TYPE_DEFAULT)
return -EINVAL;
-
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