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[S390] virtualization aware cpu measurement

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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>
This commit is contained in:
Carsten Otte
2010-05-17 10:00:04 +02:00
committed by Martin Schwidefsky
parent 6377981faf
commit cd3b70f5d4
8 changed files with 105 additions and 26 deletions
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26
arch/s390/kernel/entry64.S
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@@ -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