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s390/alternative: use a copy of the facility bit mask

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To be able to switch off specific CPU alternatives with kernel parameters
make a copy of the facility bit mask provided by STFLE and use the copy
for the decision to apply an alternative.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-01-16 07:03:44 +01:00
parent e2dd833389
commit cf14899846
6 changed files with 31 additions and 4 deletions
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18
arch/s390/include/asm/facility.h
View File

@ -15,6 +15,24 @@
#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
static inline void __set_facility(unsigned long nr, void *facilities)
{
unsigned char *ptr = (unsigned char *) facilities;
if (nr >= MAX_FACILITY_BIT)
return;
ptr[nr >> 3] |= 0x80 >> (nr & 7);
}
static inline void __clear_facility(unsigned long nr, void *facilities)
{
unsigned char *ptr = (unsigned char *) facilities;
if (nr >= MAX_FACILITY_BIT)
return;
ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
}
static inline int __test_facility(unsigned long nr, void *facilities)
{
unsigned char *ptr;

3
arch/s390/include/asm/lowcore.h
View File

@ -151,7 +151,8 @@ struct lowcore {
__u8 pad_0x0e20[0x0f00-0x0e20]; /* 0x0e20 */
/* Extended facility list */
__u64 stfle_fac_list[32]; /* 0x0f00 */
__u64 stfle_fac_list[16]; /* 0x0f00 */
__u64 alt_stfle_fac_list[16]; /* 0x0f80 */
__u8 pad_0x1000[0x11b0-0x1000]; /* 0x1000 */
/* Pointer to the machine check extended save area */

3
arch/s390/kernel/alternative.c
View File

@ -75,7 +75,8 @@ static void __init_or_module __apply_alternatives(struct alt_instr *start,
instr = (u8 *)&a->instr_offset + a->instr_offset;
replacement = (u8 *)&a->repl_offset + a->repl_offset;
if (!test_facility(a->facility))
if (!__test_facility(a->facility,
S390_lowcore.alt_stfle_fac_list))
continue;
if (unlikely(a->instrlen % 2 || a->replacementlen % 2)) {

3
arch/s390/kernel/early.c
View File

@ -193,6 +193,9 @@ static noinline __init void setup_facility_list(void)
{
stfle(S390_lowcore.stfle_fac_list,
ARRAY_SIZE(S390_lowcore.stfle_fac_list));
memcpy(S390_lowcore.alt_stfle_fac_list,
S390_lowcore.stfle_fac_list,
sizeof(S390_lowcore.alt_stfle_fac_list));
}
static __init void detect_diag9c(void)

4
arch/s390/kernel/setup.c
View File

@ -340,7 +340,9 @@ static void __init setup_lowcore(void)
lc->preempt_count = S390_lowcore.preempt_count;
lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
MAX_FACILITY_BIT/8);
sizeof(lc->stfle_fac_list));
memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
sizeof(lc->alt_stfle_fac_list));
nmi_alloc_boot_cpu(lc);
vdso_alloc_boot_cpu(lc);
lc->sync_enter_timer = S390_lowcore.sync_enter_timer;

4
arch/s390/kernel/smp.c
View File

@ -266,7 +266,9 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
__ctl_store(lc->cregs_save_area, 0, 15);
save_access_regs((unsigned int *) lc->access_regs_save_area);
memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
MAX_FACILITY_BIT/8);
sizeof(lc->stfle_fac_list));
memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
sizeof(lc->alt_stfle_fac_list));
arch_spin_lock_setup(cpu);
}