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authorCarsten Otte <cotte@de.ibm.com>2010-05-17 10:00:04 +0200
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-05-17 10:00:15 +0200
commitcd3b70f5d4d82f85d1e1d6e822f38ae098cf7c72 (patch)
treeaa394e63d300312bece2afb53a53dfd93a0f5f23 /arch/s390/kernel/entry64.S
parent6377981faf1a4425b0531e577736ef03df97c8f6 (diff)
[S390] virtualization aware cpu measurement
Use the SPP instruction to set a tag on entry to / exit of the virtual machine context. This allows the cpu measurement facility to distinguish the samples from the host and the different guests. Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry64.S')
-rw-r--r--arch/s390/kernel/entry64.S26
1 files changed, 16 insertions, 10 deletions
diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S
index 6536f5ca46f..829b759ba1e 100644
--- a/arch/s390/kernel/entry64.S
+++ b/arch/s390/kernel/entry64.S
@@ -2,7 +2,7 @@
* arch/s390/kernel/entry64.S
* S390 low-level entry points.
*
- * Copyright (C) IBM Corp. 1999,2006
+ * Copyright (C) IBM Corp. 1999,2010
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Hartmut Penner (hp@de.ibm.com),
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
@@ -59,6 +59,16 @@ _TIF_SYSCALL = (_TIF_SYSCALL_TRACE>>8 | _TIF_SYSCALL_AUDIT>>8 | \
#define BASED(name) name-system_call(%r13)
+ .macro HANDLE_SIE_INTERCEPT
+#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
+ lg %r3,__LC_SIE_HOOK
+ ltgr %r3,%r3
+ jz 0f
+ basr %r14,%r3
+ 0:
+#endif
+ .endm
+
#ifdef CONFIG_TRACE_IRQFLAGS
.macro TRACE_IRQS_ON
basr %r2,%r0
@@ -466,6 +476,7 @@ pgm_check_handler:
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime:
+ HANDLE_SIE_INTERCEPT
TRACE_IRQS_CHECK_OFF
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
mvc SP_ARGS(8,%r15),__LC_LAST_BREAK
@@ -507,6 +518,7 @@ pgm_per_std:
UPDATE_VTIME __LC_LAST_UPDATE_TIMER,__LC_EXIT_TIMER,__LC_SYSTEM_TIMER
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
pgm_no_vtime2:
+ HANDLE_SIE_INTERCEPT
TRACE_IRQS_CHECK_OFF
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
lg %r1,__TI_task(%r9)
@@ -570,6 +582,7 @@ io_int_handler:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
io_no_vtime:
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
la %r2,SP_PTREGS(%r15) # address of register-save area
brasl %r14,do_IRQ # call standard irq handler
@@ -595,15 +608,6 @@ io_done:
io_work:
tm SP_PSW+1(%r15),0x01 # returning to user ?
jo io_work_user # yes -> do resched & signal
-#if defined(CONFIG_KVM) || defined(CONFIG_KVM_MODULE)
- lg %r2,SP_PSW+8(%r15) # check if current instruction is SIE
- lh %r1,0(%r2)
- chi %r1,-19948 # signed 16 bit compare with 0xb214
- jne 0f # no -> leave PSW alone
- aghi %r2,4 # yes-> add 4 bytes to leave SIE
- stg %r2,SP_PSW+8(%r15)
-0:
-#endif
#ifdef CONFIG_PREEMPT
# check for preemptive scheduling
icm %r0,15,__TI_precount(%r9)
@@ -712,6 +716,7 @@ ext_int_handler:
mvc __LC_LAST_UPDATE_TIMER(8),__LC_ASYNC_ENTER_TIMER
ext_no_vtime:
lg %r9,__LC_THREAD_INFO # load pointer to thread_info struct
+ HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
la %r2,SP_PTREGS(%r15) # address of register-save area
llgh %r3,__LC_EXT_INT_CODE # get interruption code
@@ -786,6 +791,7 @@ mcck_no_vtime:
stosm __SF_EMPTY(%r15),0x04 # turn dat on
tm __TI_flags+7(%r9),_TIF_MCCK_PENDING
jno mcck_return
+ HANDLE_SIE_INTERCEPT
TRACE_IRQS_OFF
brasl %r14,s390_handle_mcck
TRACE_IRQS_ON