From: Heiko Carstens <hca@linux.ibm.com>
To: Douglas Freimuth <freimuth@linux.ibm.com>
Cc: borntraeger@linux.ibm.com, imbrenda@linux.ibm.com,
frankja@linux.ibm.com, david@kernel.org, gor@linux.ibm.com,
agordeev@linux.ibm.com, svens@linux.ibm.com, kvm@vger.kernel.org,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
mjrosato@linux.ibm.com
Subject: Re: [PATCH v5 3/4] KVM: s390: Change the fi->lock to a raw_spinlock for RT case
Date: Wed, 6 May 2026 06:57:34 +0200 [thread overview]
Message-ID: <20260506045734.11230A02-hca@linux.ibm.com> (raw)
In-Reply-To: <20260505173728.160562-4-freimuth@linux.ibm.com>
On Tue, May 05, 2026 at 07:37:27PM +0200, Douglas Freimuth wrote:
> s390 needs to maintain support for an RT kernel. This requires the
> floating interrupt lock, fi->lock to be changed to a raw spin lock
> since the fi->lock maybe called with interrupts disabled in __inject_io.
>
> Signed-off-by: Douglas Freimuth <freimuth@linux.ibm.com>
> ---
> arch/s390/include/asm/kvm_host.h | 2 +-
> arch/s390/kvm/intercept.c | 4 +-
> arch/s390/kvm/interrupt.c | 68 ++++++++++++++++----------------
> arch/s390/kvm/kvm-s390.c | 2 +-
> 4 files changed, 38 insertions(+), 38 deletions(-)
s390 does not support RT, but I guess you are referring to a lockdep splat
which you would see without doing this change, similar like we have seen at
other places.
Can you include the relevant parts of the splat for reference, please?
next prev parent reply other threads:[~2026-05-06 4:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-05 17:37 [PATCH v5 0/4] KVM: s390: Introducing kvm_arch_set_irq_inatomic Fast Inject Douglas Freimuth
2026-05-05 17:37 ` [PATCH v5 1/4] KVM: s390: Add map/unmap ioctl and clean mappings post-guest Douglas Freimuth
2026-05-05 17:37 ` [PATCH v5 2/4] KVM: s390: Enable adapter_indicators_set to use mapped pages Douglas Freimuth
2026-05-05 17:37 ` [PATCH v5 3/4] KVM: s390: Change the fi->lock to a raw_spinlock for RT case Douglas Freimuth
2026-05-06 4:57 ` Heiko Carstens [this message]
2026-05-05 17:37 ` [PATCH v5 4/4] KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject Douglas Freimuth
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