linux-kernel - Re: [RFC] PPC: MPIC: necessary readback after EOI?

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Message-ID: <20150108004908.GA11770@gate.crashing.org>
Date:	Wed, 7 Jan 2015 18:49:08 -0600
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Purcareata Bogdan <b43198@...escale.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] PPC: MPIC: necessary readback after EOI?

On Wed, Jan 07, 2015 at 03:40:10PM +0100, Benjamin Herrenschmidt wrote:
> One way to work around the performance loss for you would be to add some
> DT property to indicate to the guest that the read isn't necessary.

Or KVM could use a virtual interrupt controller better suited to its
needs.


Segher
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