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s390/entry: Make int handlers ready for lowcore relocation

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In preparation of having lowcore at different address than zero,
add the base register to all lowcore accesses in the ext/io interrupt
handlers.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2024-07-22 15:41:21 +02:00 committed by Vasily Gorbik
parent 9e1e275fa2
commit bd2c55b307
1 changed files with 16 additions and 15 deletions
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31
arch/s390/kernel/entry.S
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@ -395,26 +395,27 @@ SYM_CODE_END(pgm_check_handler)
*/
.macro INT_HANDLER name,lc_old_psw,handler
SYM_CODE_START(\name)
stckf __LC_INT_CLOCK
stpt __LC_SYS_ENTER_TIMER
STBEAR __LC_LAST_BREAK
STMG_LC %r8,%r15,__LC_SAVE_AREA_ASYNC
GET_LC %r13
stckf __LC_INT_CLOCK(%r13)
stpt __LC_SYS_ENTER_TIMER(%r13)
STBEAR __LC_LAST_BREAK(%r13)
BPOFF
stmg %r8,%r15,__LC_SAVE_AREA_ASYNC
lmg %r8,%r9,\lc_old_psw
lmg %r8,%r9,\lc_old_psw(%r13)
tmhh %r8,0x0001 # interrupting from user ?
jnz 1f
#if IS_ENABLED(CONFIG_KVM)
lg %r10,__LC_CURRENT
lg %r10,__LC_CURRENT(%r13)
tm __TI_sie(%r10),0xff
jz 0f
BPENTER __SF_SIE_FLAGS(%r15),_TIF_ISOLATE_BP_GUEST
SIEEXIT __SF_SIE_CONTROL(%r15),%r0
SIEEXIT __SF_SIE_CONTROL(%r15),%r13
#endif
0: CHECK_STACK __LC_SAVE_AREA_ASYNC,%r0
0: CHECK_STACK __LC_SAVE_AREA_ASYNC,%r13
aghi %r15,-(STACK_FRAME_OVERHEAD + __PT_SIZE)
j 2f
1: lctlg %c1,%c1,__LC_KERNEL_ASCE
lg %r15,__LC_KERNEL_STACK
1: lctlg %c1,%c1,__LC_KERNEL_ASCE(%r13)
lg %r15,__LC_KERNEL_STACK(%r13)
2: xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
la %r11,STACK_FRAME_OVERHEAD(%r15)
stmg %r0,%r7,__PT_R0(%r11)
@ -428,18 +429,18 @@ SYM_CODE_START(\name)
xgr %r7,%r7
xgr %r10,%r10
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC
MBEAR %r11,%r0
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_ASYNC(%r13)
MBEAR %r11,%r13
stmg %r8,%r9,__PT_PSW(%r11)
lgr %r2,%r11 # pass pointer to pt_regs
brasl %r14,\handler
mvc __LC_RETURN_PSW(16),__PT_PSW(%r11)
mvc __LC_RETURN_PSW(16,%r13),__PT_PSW(%r11)
tmhh %r8,0x0001 # returning to user ?
jno 2f
STACKLEAK_ERASE
lctlg %c1,%c1,__LC_USER_ASCE
lctlg %c1,%c1,__LC_USER_ASCE(%r13)
BPON
stpt __LC_EXIT_TIMER
stpt __LC_EXIT_TIMER(%r13)
2: LBEAR __PT_LAST_BREAK(%r11)
lmg %r0,%r15,__PT_R0(%r11)
LPSWEY __LC_RETURN_PSW,__LC_RETURN_LPSWE