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s390/mcck: cleanup use of cleanup_sie_mcck

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cleanup_sie_mcck label is called from a single location only
and thus does not need to be a subroutine. Move the labelled
code to the caller - by doing that the SIE critical section
checks appear next to each other and the SIE cleanup becomes
bit more readable.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2021-05-17 08:18:13 +02:00 committed by Vasily Gorbik
parent 3bd6958136
commit 20232b18e5
1 changed files with 10 additions and 12 deletions
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22
arch/s390/kernel/entry.S
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@ -214,7 +214,7 @@ ENTRY(sie64a)
# are some corner cases (e.g. runtime instrumentation) where ILC is unpredictable.
# Other instructions between sie64a and .Lsie_done should not cause program
# interrupts. So lets use 3 nops as a landing pad for all possible rewinds.
# See also .Lcleanup_sie_mcck/.Lcleanup_sie_int
# See also .Lcleanup_sie
.Lrewind_pad6:
nopr 7
.Lrewind_pad4:
@ -399,7 +399,7 @@ ENTRY(\name)
lghi %r13,.Lsie_done - .Lsie_gmap
clgr %r14,%r13
jhe 0f
brasl %r14,.Lcleanup_sie_int
brasl %r14,.Lcleanup_sie
#endif
0: CHECK_STACK __LC_SAVE_AREA_ASYNC
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
@ -547,7 +547,13 @@ ENTRY(mcck_int_handler)
lghi %r13,.Lsie_done - .Lsie_gmap
clgr %r14,%r13
jhe .Lmcck_stack
brasl %r14,.Lcleanup_sie_mcck
larl %r13,.Lsie_entry
slgr %r9,%r13
lghi %r13,.Lsie_skip - .Lsie_entry
clgr %r9,%r13
jhe 5f
oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
5: brasl %r14,.Lcleanup_sie
#endif
j .Lmcck_stack
.Lmcck_user:
@ -649,21 +655,13 @@ ENDPROC(stack_overflow)
#endif
#if IS_ENABLED(CONFIG_KVM)
.Lcleanup_sie_mcck:
larl %r13,.Lsie_entry
slgr %r9,%r13
lghi %r13,.Lsie_skip - .Lsie_entry
clgr %r9,%r13
jhe .Lcleanup_sie_int
oi __LC_CPU_FLAGS+7, _CIF_MCCK_GUEST
.Lcleanup_sie_int:
.Lcleanup_sie:
BPENTER __SF_SIE_FLAGS(%r15),(_TIF_ISOLATE_BP|_TIF_ISOLATE_BP_GUEST)
lg %r9,__SF_SIE_CONTROL(%r15) # get control block pointer
ni __SIE_PROG0C+3(%r9),0xfe # no longer in SIE
lctlg %c1,%c1,__LC_KERNEL_ASCE
larl %r9,sie_exit # skip forward to sie_exit
BR_EX %r14,%r13
#endif
.section .rodata, "a"
#define SYSCALL(esame,emu) .quad __s390x_ ## esame