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s390/nmi: Simplify ptregs setup

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The low level machine check handler code fills the ptregs structure
partially with the register contents present at machine check handler
entry and partially with contents from the machine check save area.

In case of a machine check the contents of all general purpose
registers are saved by the CPU to the machine check save area.
Therefore simplify the code and fill the ptregs structure by only
using the machine check save area as source.

Signed-off-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:
Heiko Carstens 2024-07-22 15:41:11 +02:00 committed by Vasily Gorbik
parent beb8cee06f
commit 213400c4af
1 changed files with 2 additions and 3 deletions
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5
arch/s390/kernel/entry.S
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@ -491,8 +491,8 @@ SYM_CODE_START(mcck_int_handler)
stctg %c1,%c1,__PT_CR1(%r11)
lctlg %c1,%c1,__LC_KERNEL_ASCE
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)
lghi %r14,__LC_GPREGS_SAVE_AREA+64
stmg %r0,%r7,__PT_R0(%r11)
lghi %r14,__LC_GPREGS_SAVE_AREA
mvc __PT_R0(128,%r11),0(%r14)
# clear user controlled registers to prevent speculative use
xgr %r0,%r0
xgr %r1,%r1
@ -502,7 +502,6 @@ SYM_CODE_START(mcck_int_handler)
xgr %r6,%r6
xgr %r7,%r7
xgr %r10,%r10
mvc __PT_R8(64,%r11),0(%r14)
stmg %r8,%r9,__PT_PSW(%r11)
xc __PT_FLAGS(8,%r11),__PT_FLAGS(%r11)
xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15)