Bug 4503 - s390/smp: perform cpu reset before delegating work to target cpu
Summary: s390/smp: perform cpu reset before delegating work to target cpu
Status: NEW
Alias: None
Product: ANCK 5.10 Dev
Classification: ANCK
Component: sched (show other bugs) sched
Version: 5.10.y-9
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: Alierwei
QA Contact: shuming
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-03-14 10:55 UTC by lxl_snow
Modified: 2023-03-14 10:55 UTC (History)
2 users (show)

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Description lxl_snow 2023-03-14 10:55:13 UTC 
Description of problem:
s390/smp: perform cpu reset before delegating work to target cpu
Clear CPU state (e.g. all TLB entries, prefetched instructions, etc.)
of the target CPU, however without clearing register contents before
starting any work on it.

This puts the target CPU in a more defined state compared to the
current Stop + Restart sigp orders.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Additional info:
Upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e688c6255b742428ea8fa7e4fb8181a6135205e9