s390: do not bypass BPENTER for interrupt system calls

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[ Upstream commit d5feec04fe ]

The system call path can be interrupted before the switch back to the
standard branch prediction with BPENTER has been done. The critical
section cleanup code skips forward to .Lsysc_do_svc and bypasses the
BPENTER. In this case the kernel and all subsequent code will run with
the limited branch prediction.

Fixes: eacf67eb9b32 ("s390: run user space and KVM guests with modified branch prediction")
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Schwidefsky 2018-04-27 07:36:36 +02:00 • committed by Greg Kroah-Hartman

parent 6288e169a2

commit 74a93ae5c3

1 changed files with 1 additions and 0 deletions

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arch/s390/kernel/entry.S

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