From: Steven Rostedt <rostedt@goodmis.org>
To: Julien Grall <julien.grall@arm.com>
Cc: linux-rt-users <linux-rt-users@vger.kernel.org>,
julia@ni.com, Marc Zyngier <marc.zyngier@arm.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: KVM Arm Device passthrough and linux-rt
Date: Tue, 4 Jun 2019 09:16:07 -0400 [thread overview]
Message-ID: <20190604091607.2e87eb36@oasis.local.home> (raw)
In-Reply-To: <26832850-37ee-ae07-08ca-cc3e90978867@arm.com>
On Tue, 4 Jun 2019 13:58:51 +0100
Julien Grall <julien.grall@arm.com> wrote:
> This is happening because vgic_v2_fold_lr_state() is expected
> to be called with interrupt disabled. However, some of the path
> (e.g eventfd) will take a spinlock.
>
> The spinlock is from the waitqueue, so using a raw_spin_lock cannot
> even be considered.
>
> Do you have any input on how this could be solved?
What's the reason that vgic_v2_fold_lr_state() expects interrupts to be
disabled?
-- Steve
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next prev parent reply other threads:[~2019-06-04 13:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-04 12:58 KVM Arm Device passthrough and linux-rt Julien Grall
2019-06-04 13:16 ` Steven Rostedt [this message]
2019-06-04 13:53 ` Marc Zyngier
2019-06-04 14:28 ` Marc Zyngier
2019-06-04 15:04 ` Steven Rostedt
2019-06-04 13:50 ` Sebastian Andrzej Siewior
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