From: Nathan Lynch <nathanl@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: tyreld@linux.ibm.com, brking@linux.ibm.com, npiggin@gmail.com
Subject: [PATCH 0/2] handle premature return from H_JOIN in pseries mobility code
Date: Mon, 15 Mar 2021 03:00:43 -0500 [thread overview]
Message-ID: <20210315080045.460331-1-nathanl@linux.ibm.com> (raw)
pseries VMs in shared processor mode are susceptible to failed
migrations becasue stray H_PRODs from the paravirt spinlock
implementation can bump threads out of joining state before the
suspend has occurred. Fix this by adding a small amount of shared
state and ordering accesses to it with respect to H_PROD and H_JOIN.
Nathan Lynch (2):
powerpc/pseries/mobility: use struct for shared state
powerpc/pseries/mobility: handle premature return from H_JOIN
arch/powerpc/platforms/pseries/mobility.c | 48 +++++++++++++++++++++--
1 file changed, 44 insertions(+), 4 deletions(-)
--
2.29.2
next reply other threads:[~2021-03-15 8:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 8:00 Nathan Lynch [this message]
2021-03-15 8:00 ` [PATCH 1/2] powerpc/pseries/mobility: use struct for shared state Nathan Lynch
2021-03-15 8:00 ` [PATCH 2/2] powerpc/pseries/mobility: handle premature return from H_JOIN Nathan Lynch
2021-03-16 2:37 ` [PATCH 0/2] handle premature return from H_JOIN in pseries mobility code Nicholas Piggin
2021-03-23 12:02 ` Michael Ellerman
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