s390: run user space and KVM guests with modified branch prediction

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[ Upstream commit 6b73044b2b ]

Define TIF_ISOLATE_BP and TIF_ISOLATE_BP_GUEST and add the necessary
plumbing in entry.S to be able to run user space and KVM guests with
limited branch prediction.

To switch a user space process to limited branch prediction the
s390_isolate_bp() function has to be call, and to run a vCPU of a KVM
guest associated with the current task with limited branch prediction
call s390_isolate_bp_guest().

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 07:36:32 +02:00 • committed by Greg Kroah-Hartman

parent 43cccd87c1

commit 0bd4c47c20

4 changed files with 71 additions and 5 deletions

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3

arch/s390/include/asm/processor.h

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4

arch/s390/include/asm/thread_info.h

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51

arch/s390/kernel/entry.S

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18

arch/s390/kernel/processor.c

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