diff options
| -rw-r--r-- | arch/s390/include/asm/lowcore.h | 9 | ||||
| -rw-r--r-- | arch/s390/include/asm/setup.h | 3 | ||||
| -rw-r--r-- | arch/s390/kernel/asm-offsets.c | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/entry.S | 28 | ||||
| -rw-r--r-- | arch/s390/kernel/head64.S | 7 | ||||
| -rw-r--r-- | arch/s390/kernel/perf_cpum_sf.c | 10 | ||||
| -rw-r--r-- | arch/s390/kernel/smp.c | 2 | ||||
| -rw-r--r-- | arch/s390/mm/fault.c | 4 |
8 files changed, 40 insertions, 24 deletions
diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 663f23e37460..12af453c3c19 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -132,7 +132,14 @@ struct _lowcore { /* Address space pointer. */ __u64 kernel_asce; /* 0x0358 */ __u64 user_asce; /* 0x0360 */ - __u64 current_pid; /* 0x0368 */ + + /* + * The lpp and current_pid fields form a + * 64-bit value that is set as program + * parameter with the LPP instruction. + */ + __u32 lpp; /* 0x0368 */ + __u32 current_pid; /* 0x036c */ /* SMP info area */ __u32 cpu_nr; /* 0x0370 */ diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h index ab015a7f20d0..23537661da0e 100644 --- a/arch/s390/include/asm/setup.h +++ b/arch/s390/include/asm/setup.h @@ -34,6 +34,9 @@ #define MACHINE_FLAG_VX _BITUL(18) #define MACHINE_FLAG_CAD _BITUL(19) +#define LPP_MAGIC _BITUL(31) +#define LPP_PFAULT_PID_MASK _AC(0xffffffff, UL) + #ifndef __ASSEMBLY__ #include <asm/lowcore.h> diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index ac857c452be2..9cd248f637c7 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -163,6 +163,7 @@ int main(void) OFFSET(__LC_RESTART_DATA, _lowcore, restart_data); OFFSET(__LC_RESTART_SOURCE, _lowcore, restart_source); OFFSET(__LC_USER_ASCE, _lowcore, user_asce); + OFFSET(__LC_LPP, _lowcore, lpp); OFFSET(__LC_CURRENT_PID, _lowcore, current_pid); OFFSET(__LC_PERCPU_OFFSET, _lowcore, percpu_offset); OFFSET(__LC_VDSO_PER_CPU, _lowcore, vdso_per_cpu_data); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 2444ea7f7ba4..d653a87d66b5 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -187,8 +187,11 @@ ENTRY(__switch_to) stg %r15,__LC_KERNEL_STACK # store end of kernel stack lg %r15,__THREAD_ksp(%r1) # load kernel stack of next lctl %c4,%c4,__TASK_pid(%r3) # load pid to control reg. 4 - mvc __LC_CURRENT_PID+4(4,%r0),__TASK_pid(%r3) # store pid of next + mvc __LC_CURRENT_PID(4,%r0),__TASK_pid(%r3) # store pid of next lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task + TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP + bzr %r14 + .insn s,0xb2800000,__LC_LPP # set program parameter br %r14 .L__critical_start: @@ -203,7 +206,7 @@ ENTRY(sie64a) stmg %r6,%r14,__SF_GPRS(%r15) # save kernel registers stg %r2,__SF_EMPTY(%r15) # save control block pointer stg %r3,__SF_EMPTY+8(%r15) # save guest register save area - xc __SF_EMPTY+16(16,%r15),__SF_EMPTY+16(%r15) # host id & reason + xc __SF_EMPTY+16(8,%r15),__SF_EMPTY+16(%r15) # reason code = 0 TSTMSK __LC_CPU_FLAGS,_CIF_FPU # load guest fp/vx registers ? jno .Lsie_load_guest_gprs brasl %r14,load_fpu_regs # load guest fp/vx regs @@ -220,14 +223,7 @@ ENTRY(sie64a) jnz .Lsie_skip TSTMSK __LC_CPU_FLAGS,_CIF_FPU jo .Lsie_skip # exit if fp/vx regs changed - TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP - jz .Lsie_enter - .insn s,0xb2800000,__LC_CURRENT_PID # set guest id to pid -.Lsie_enter: sie 0(%r14) - TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP - jz .Lsie_skip - .insn s,0xb2800000,__SF_EMPTY+16(%r15)# set host id .Lsie_skip: ni __SIE_PROG0C+3(%r14),0xfe # no longer in SIE lctlg %c1,%c1,__LC_USER_ASCE # load primary asce @@ -244,11 +240,11 @@ sie_exit: lg %r14,__SF_EMPTY+8(%r15) # load guest register save area stmg %r0,%r13,0(%r14) # save guest gprs 0-13 lmg %r6,%r14,__SF_GPRS(%r15) # restore kernel registers - lg %r2,__SF_EMPTY+24(%r15) # return exit reason code + lg %r2,__SF_EMPTY+16(%r15) # return exit reason code br %r14 .Lsie_fault: lghi %r14,-EFAULT - stg %r14,__SF_EMPTY+24(%r15) # set exit reason code + stg %r14,__SF_EMPTY+16(%r15) # set exit reason code j sie_exit EX_TABLE(.Lrewind_pad,.Lsie_fault) @@ -938,7 +934,10 @@ ENTRY(mcck_int_handler) # PSW restart interrupt handler # ENTRY(restart_int_handler) - stg %r15,__LC_SAVE_AREA_RESTART + TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP + jz 0f + .insn s,0xb2800000,__LC_LPP +0: stg %r15,__LC_SAVE_AREA_RESTART lg %r15,__LC_RESTART_STACK aghi %r15,-__PT_SIZE # create pt_regs on stack xc 0(__PT_SIZE,%r15),0(%r15) @@ -1042,10 +1041,7 @@ cleanup_critical: .Lcleanup_sie: lg %r9,__SF_EMPTY(%r15) # get control block pointer - TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP - jz 0f - .insn s,0xb2800000,__SF_EMPTY+16(%r15)# set host id -0: ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE + ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE lctlg %c1,%c1,__LC_USER_ASCE # load primary asce larl %r9,sie_exit # skip forward to sie_exit br %r14 diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index d7c00507568a..58b719fa8067 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -16,7 +16,12 @@ __HEAD ENTRY(startup_continue) - larl %r1,sched_clock_base_cc + tm __LC_STFL_FAC_LIST+6,0x80 # LPP available ? + jz 0f + xc __LC_LPP+1(7,0),__LC_LPP+1 # clear lpp and current_pid + mvi __LC_LPP,0x80 # and set LPP_MAGIC + .insn s,0xb2800000,__LC_LPP # load program parameter +0: larl %r1,sched_clock_base_cc mvc 0(8,%r1),__LC_LAST_UPDATE_CLOCK larl %r13,.LPG1 # get base lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index b973972f6ba5..3d8da1e742c2 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1019,11 +1019,13 @@ static int perf_push_sample(struct perf_event *event, struct sf_raw_sample *sfr) break; } - /* The host-program-parameter (hpp) contains the pid of - * the CPU thread as set by sie64a() in entry.S. - * If non-zero assume a guest sample. + /* + * A non-zero guest program parameter indicates a guest + * sample. + * Note that some early samples might be misaccounted to + * the host. */ - if (sfr->basic.hpp) + if (sfr->basic.gpp) sde_regs->in_guest = 1; overflow = 0; diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index dbd40d448294..9062df575afe 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -262,6 +262,8 @@ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk) + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); lc->thread_info = (unsigned long) task_thread_info(tsk); lc->current_task = (unsigned long) tsk; + lc->lpp = LPP_MAGIC; + lc->current_pid = tsk->pid; lc->user_timer = ti->user_timer; lc->system_timer = ti->system_timer; lc->steal_timer = 0; diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 77b3938d6bfa..ec1a30d0d11a 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -590,7 +590,7 @@ int pfault_init(void) .reffcode = 0, .refdwlen = 5, .refversn = 2, - .refgaddr = __LC_CURRENT_PID, + .refgaddr = __LC_LPP, .refselmk = 1ULL << 48, .refcmpmk = 1ULL << 48, .reserved = __PF_RES_FIELD }; @@ -649,7 +649,7 @@ static void pfault_interrupt(struct ext_code ext_code, return; inc_irq_stat(IRQEXT_PFL); /* Get the token (= pid of the affected task). */ - pid = param64; + pid = param64 & LPP_PFAULT_PID_MASK; rcu_read_lock(); tsk = find_task_by_pid_ns(pid, &init_pid_ns); if (tsk) |