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| author |   Alexander Gordeev <agordeev@linux.ibm.com> | 2022-05-23 12:38:14 +0200 |
|---|---|---|
| committer |   Heiko Carstens <hca@linux.ibm.com> | 2022-06-01 12:03:16 +0200 |
| commit | 29ccaa4b35ea874ddd50518e5c2c746b9238a792 (patch) | |
| tree | 317746bcb0adf1e3bf3ff60c105644e7d21544fb /arch/s390/include/asm/uaccess.h | |
| parent | s390/mm: use non-quiescing sske for KVM switch to keyed guest (diff) | |
| download | linux-dev-29ccaa4b35ea874ddd50518e5c2c746b9238a792.tar.xz linux-dev-29ccaa4b35ea874ddd50518e5c2c746b9238a792.zip | |
s390/mcck: isolate SIE instruction when setting CIF_MCCK_GUEST flag
Commit d768bd892fc8 ("s390: add options to change branch prediction
behaviour for the kernel") introduced .Lsie_exit label - supposedly
to fence off SIE instruction. However, the corresponding address
range length .Lsie_crit_mcck_length was not updated, which led to
BPON code potentionally marked with CIF_MCCK_GUEST flag.
Both .Lsie_exit and .Lsie_crit_mcck_length were removed with commit
0b0ed657fe00 ("s390: remove critical section cleanup from entry.S"),
but the issue persisted - currently BPOFF and BPENTER macros might
get wrongly considered by the machine check handler as a guest.
Fixes: d768bd892fc8 ("s390: add options to change branch prediction behaviour for the kernel")
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/uaccess.h')
0 files changed, 0 insertions, 0 deletions