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From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org,
	chzigotzky@xenosoft.de
Cc: sshegde@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com,
	christophe.leroy@csgroup.eu, linux-kernel@vger.kernel.org,
	msuchanek@suse.de, ritesh.list@gmail.com, harshpb@linux.ibm.com,
	gautam@linux.ibm.com, amachhiw@linux.ibm.com,
	venkat88@linux.ibm.com, nnmlinux@linux.ibm.com
Subject: [PATCH 0/2] KVM: PPC: BookE: Fix boot hang on preemptible kernels
Date: Mon, 28 Sep 2026 16:34:09 +0530	[thread overview]
Message-ID: <20260928110411.844582-1-sshegde@linux.ibm.com> (raw)

Christian Zigotzky had reported that preemptible kernels don't boot on
his FSL Cyrus+ board. The board freezes on running either full/lazy
preemption and has been an issue for a while now.

https://lore.kernel.org/all/b897b0fd-90f2-4215-bcd4-3714e497d773@xenosoft.de/#t

After 7.0, there is only preempt=full/lazy which removed the
preempt=none/voluntary workaround used to mask the issue. There was
challenge is getting the console logs which made the fixes difficult since
one couldn't know where the issue is.

Thanks to Michal for helping in getting the logs. That pointed at few
places where the issue could be. This series is an attempt at fixing
those.

Christian, KVM team, 
Please *test* the patches.

Shrikanth Hegde (2):
  KVM: PPC: BookE: Disable preemption before loading guest FP and
    Altivec
  KVM: PPC: Replay pending interrupts before entering the guest

 arch/powerpc/kvm/booke.c   |  9 ++++++++-
 arch/powerpc/kvm/powerpc.c | 13 +++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

-- 
2.52.0


             reply	other threads:[~2026-09-28 11:04 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-28 11:04 Shrikanth Hegde [this message]
2026-09-28 11:04 ` [PATCH 1/2] KVM: PPC: BookE: Disable preemption before loading guest FP and Altivec Shrikanth Hegde
2026-09-28 11:04 ` [PATCH 2/2] KVM: PPC: Replay pending interrupts before entering the guest Shrikanth Hegde

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