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livepatch: add support on s390

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This is a trivial port from kGraft. Module relocations are not supported yet.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Jiri Slaby 2015-03-26 10:10:17 +01:00 committed by Jiri Kosina
parent 2e3ac940f2
commit 21042d43b3
2 changed files with 46 additions and 0 deletions
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3
arch/s390/Kconfig
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@ -133,6 +133,7 @@ config S390
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_KVM if 64BIT
select HAVE_LIVEPATCH
select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_MEMBLOCK_PHYS_MAP
@ -160,6 +161,8 @@ source "init/Kconfig"
source "kernel/Kconfig.freezer"
source "kernel/livepatch/Kconfig"
menu "Processor type and features"
config HAVE_MARCH_Z900_FEATURES

43
arch/s390/include/asm/livepatch.h Normal file
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@ -0,0 +1,43 @@
/*
* livepatch.h - s390-specific Kernel Live Patching Core
*
* Copyright (c) 2013-2015 SUSE
* Authors: Jiri Kosina
* Vojtech Pavlik
* Jiri Slaby
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#ifndef ASM_LIVEPATCH_H
#define ASM_LIVEPATCH_H
#include <linux/module.h>
#ifdef CONFIG_LIVEPATCH
static inline int klp_check_compiler_support(void)
{
return 0;
}
static inline int klp_write_module_reloc(struct module *mod, unsigned long
type, unsigned long loc, unsigned long value)
{
/* not supported yet */
return -ENOSYS;
}
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->psw.addr = ip;
}
#else
#error Live patching support is disabled; check CONFIG_LIVEPATCH
#endif
#endif