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s390: move nobp parameter functions to nospec-branch.c 

Keep the code for the nobp parameter handling with the code for
expolines. Both are related to the spectre v2 mitigation.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-03-23 17:09:39 +01:00
parent b9dd652499
commit b2e2f43a01
3 changed files with 29 additions and 25 deletions
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4
arch/s390/kernel/Makefile
View File

@ -61,11 +61,11 @@ obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o als.o
obj-y += sysinfo.o jump_label.o lgr.o os_info.o machine_kexec.o pgm_check.o
obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
obj-y += nospec-branch.o
extra-y += head.o head64.o vmlinux.lds
obj-$(CONFIG_EXPOLINE) += nospec-branch.o
CFLAGS_REMOVE_expoline.o += $(CC_FLAGS_EXPOLINE)
CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_SMP) += smp.o

23
arch/s390/kernel/alternative.c
View File

@ -15,29 +15,6 @@ static int __init disable_alternative_instructions(char *str)
early_param("noaltinstr", disable_alternative_instructions);
static int __init nobp_setup_early(char *str)
{
bool enabled;
int rc;
rc = kstrtobool(str, &enabled);
if (rc)
return rc;
if (enabled && test_facility(82))
__set_facility(82, S390_lowcore.alt_stfle_fac_list);
else
__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
return 0;
}
early_param("nobp", nobp_setup_early);
static int __init nospec_setup_early(char *str)
{
__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
return 0;
}
early_param("nospec", nospec_setup_early);
struct brcl_insn {
u16 opc;
s32 disp;

27
arch/s390/kernel/nospec-branch.c
View File

@ -2,6 +2,31 @@
#include <linux/module.h>
#include <asm/nospec-branch.h>
static int __init nobp_setup_early(char *str)
{
bool enabled;
int rc;
rc = kstrtobool(str, &enabled);
if (rc)
return rc;
if (enabled && test_facility(82))
__set_facility(82, S390_lowcore.alt_stfle_fac_list);
else
__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
return 0;
}
early_param("nobp", nobp_setup_early);
static int __init nospec_setup_early(char *str)
{
__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
return 0;
}
early_param("nospec", nospec_setup_early);
#ifdef CONFIG_EXPOLINE
int nospec_call_disable = IS_ENABLED(CONFIG_EXPOLINE_OFF);
int nospec_return_disable = !IS_ENABLED(CONFIG_EXPOLINE_FULL);
@ -98,3 +123,5 @@ void __init nospec_init_branches(void)
nospec_call_revert(__nospec_call_start, __nospec_call_end);
nospec_return_revert(__nospec_return_start, __nospec_return_end);
}
#endif /* CONFIG_EXPOLINE */