linux-kernel - Re: [PATCH 0/2] powerpc/kvm: Enable running guests on RT Linux

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Message-ID: <20150225163649.GD6823@linutronix.de>
Date:	Wed, 25 Feb 2015 17:36:49 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Scott Wood <scottwood@...escale.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	Alexander Graf <agraf@...e.de>,
	Bogdan Purcareata <bogdan.purcareata@...escale.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, mihai.caraman@...escale.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/2] powerpc/kvm: Enable running guests on RT Linux

* Scott Wood | 2015-02-23 17:27:31 [-0600]:

>This isn't a host PIC driver.  It's guest PIC emulation, some of which
>is indeed not suitable for a rawlock (in particular, openpic_update_irq
>which loops on the number of vcpus, with a loop body that calls
>IRQ_check() which loops over all pending IRQs).  The vcpu limits are a
>temporary bandaid to avoid the worst latencies, but I'm still skeptical
>about this being upstream material.

Okay.

>-Scott

Sebastian
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