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s390/alternative: use a copy of the facility bit mask
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>
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@ -15,6 +15,24 @@
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#define MAX_FACILITY_BIT (sizeof(((struct lowcore *)0)->stfle_fac_list) * 8)
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static inline void __set_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr = (unsigned char *) facilities;
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if (nr >= MAX_FACILITY_BIT)
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return;
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ptr[nr >> 3] |= 0x80 >> (nr & 7);
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}
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static inline void __clear_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr = (unsigned char *) facilities;
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if (nr >= MAX_FACILITY_BIT)
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return;
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ptr[nr >> 3] &= ~(0x80 >> (nr & 7));
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}
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static inline int __test_facility(unsigned long nr, void *facilities)
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{
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unsigned char *ptr;
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@ -151,7 +151,8 @@ struct lowcore {
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__u8 pad_0x0e20[0x0f00-0x0e20]; /* 0x0e20 */
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/* Extended facility list */
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__u64 stfle_fac_list[32]; /* 0x0f00 */
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__u64 stfle_fac_list[16]; /* 0x0f00 */
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__u64 alt_stfle_fac_list[16]; /* 0x0f80 */
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__u8 pad_0x1000[0x11b0-0x1000]; /* 0x1000 */
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/* Pointer to the machine check extended save area */
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@ -75,7 +75,8 @@ static void __init_or_module __apply_alternatives(struct alt_instr *start,
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instr = (u8 *)&a->instr_offset + a->instr_offset;
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replacement = (u8 *)&a->repl_offset + a->repl_offset;
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if (!test_facility(a->facility))
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if (!__test_facility(a->facility,
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S390_lowcore.alt_stfle_fac_list))
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continue;
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if (unlikely(a->instrlen % 2 || a->replacementlen % 2)) {
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@ -193,6 +193,9 @@ static noinline __init void setup_facility_list(void)
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{
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stfle(S390_lowcore.stfle_fac_list,
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ARRAY_SIZE(S390_lowcore.stfle_fac_list));
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memcpy(S390_lowcore.alt_stfle_fac_list,
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S390_lowcore.stfle_fac_list,
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sizeof(S390_lowcore.alt_stfle_fac_list));
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}
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static __init void detect_diag9c(void)
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@ -340,7 +340,9 @@ static void __init setup_lowcore(void)
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lc->preempt_count = S390_lowcore.preempt_count;
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lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
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memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
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MAX_FACILITY_BIT/8);
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sizeof(lc->stfle_fac_list));
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memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
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sizeof(lc->alt_stfle_fac_list));
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nmi_alloc_boot_cpu(lc);
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vdso_alloc_boot_cpu(lc);
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lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
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@ -266,7 +266,9 @@ static void pcpu_prepare_secondary(struct pcpu *pcpu, int cpu)
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__ctl_store(lc->cregs_save_area, 0, 15);
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save_access_regs((unsigned int *) lc->access_regs_save_area);
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memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
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MAX_FACILITY_BIT/8);
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sizeof(lc->stfle_fac_list));
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memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
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sizeof(lc->alt_stfle_fac_list));
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arch_spin_lock_setup(cpu);
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}
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