[S390] cpu hotplug and accounting values

Reset the cpu timer to the maximum value and correctly initialize the
cpu accounting values in the lowcore when the cpu is started.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 28 insertions, 0 deletions

diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 67a60016babb..fa9905ce7d0b 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -27,6 +27,8 @@ int main(void)
         DEFINE(__TI_flags, offsetof(struct thread_info, flags));
         DEFINE(__TI_cpu, offsetof(struct thread_info, cpu));
         DEFINE(__TI_precount, offsetof(struct thread_info, preempt_count));
+        DEFINE(__TI_user_timer, offsetof(struct thread_info, user_timer));
+        DEFINE(__TI_system_timer, offsetof(struct thread_info, system_timer));
         BLANK();
         DEFINE(__PT_ARGS, offsetof(struct pt_regs, args));
         DEFINE(__PT_PSW, offsetof(struct pt_regs, psw));
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index 1268aa2991bf..f3e275934213 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -837,16 +837,29 @@ mcck_return:
         __CPUINIT
         .globl restart_int_handler
 restart_int_handler:
+        basr    %r1,0
+restart_base:
+        spt     restart_vtime-restart_base(%r1)
+        stck    __LC_LAST_UPDATE_CLOCK
+        mvc     __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
+        mvc     __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
         l       %r15,__LC_SAVE_AREA+60  # load ksp
         lctl    %c0,%c15,__LC_CREGS_SAVE_AREA # get new ctl regs
         lam     %a0,%a15,__LC_AREGS_SAVE_AREA
         lm      %r6,%r15,__SF_GPRS(%r15) # load registers from clone
+        l       %r1,__LC_THREAD_INFO
+        mvc     __LC_USER_TIMER(8),__TI_user_timer(%r1)
+        mvc     __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
+        xc      __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
         stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
         basr    %r14,0
         l       %r14,restart_addr-.(%r14)
         br      %r14                    # branch to start_secondary
 restart_addr:
         .long   start_secondary
+        .align  8
+restart_vtime:
+        .long   0x7fffffff,0xffffffff
         .previous
 #else
 /*
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index c6fbde13971a..84a105838e03 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -831,14 +831,27 @@ mcck_return:
         __CPUINIT
         .globl restart_int_handler
 restart_int_handler:
+        basr    %r1,0
+restart_base:
+        spt     restart_vtime-restart_base(%r1)
+        stck    __LC_LAST_UPDATE_CLOCK
+        mvc     __LC_LAST_UPDATE_TIMER(8),restart_vtime-restart_base(%r1)
+        mvc     __LC_EXIT_TIMER(8),restart_vtime-restart_base(%r1)
         lg      %r15,__LC_SAVE_AREA+120 # load ksp
         lghi    %r10,__LC_CREGS_SAVE_AREA
         lctlg   %c0,%c15,0(%r10) # get new ctl regs
         lghi    %r10,__LC_AREGS_SAVE_AREA
         lam     %a0,%a15,0(%r10)
         lmg     %r6,%r15,__SF_GPRS(%r15) # load registers from clone
+        lg      %r1,__LC_THREAD_INFO
+        mvc     __LC_USER_TIMER(8),__TI_user_timer(%r1)
+        mvc     __LC_SYSTEM_TIMER(8),__TI_system_timer(%r1)
+        xc      __LC_STEAL_TIMER(8),__LC_STEAL_TIMER
         stosm   __SF_EMPTY(%r15),0x04   # now we can turn dat on
         jg      start_secondary
+        .align  8
+restart_vtime:
+        .long   0x7fffffff,0xffffffff
         .previous
 #else
 /*