From: Scott Wood <scottwood@freescale.com>
To: Alexander Graf <agraf@suse.de>
Cc: linuxppc-dev@lists.ozlabs.org, Stuart Yoder <stuart.yoder@freescale.com>
Subject: Re: [PATCH] powerpc/booke: Eliminate rfi from exception entry path.
Date: Tue, 10 Jul 2012 19:47:41 -0500 [thread overview]
Message-ID: <4FFCCD2D.20407@freescale.com> (raw)
In-Reply-To: <E139BF8E-A72C-4977-8FB9-6EED5803AB9A@suse.de>
On 07/10/2012 07:44 PM, Alexander Graf wrote:
>
> On 11.07.2012, at 02:34, Scott Wood wrote:
>> +#ifdef CONFIG_BOOKE
>> + /*
>> + * We're not changing address space on Book E, and the extra rfi
>> + * can hurt when virtualized without hardware support -- whereas
>> + * mtmsr can be paravirtualized.
>
> We can always paravirtualize RFI as well if it makes sense.
I'm not sure that's possible. We thought about it a while back, but
IIRC the difficulty was not leaving a register clobbered.
-Scott
next prev parent reply other threads:[~2012-07-11 0:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-11 0:34 [PATCH] powerpc/booke: Eliminate rfi from exception entry path Scott Wood
2012-07-11 0:36 ` Benjamin Herrenschmidt
2012-07-11 0:41 ` Scott Wood
2012-07-11 0:53 ` Benjamin Herrenschmidt
2012-07-11 0:44 ` Alexander Graf
2012-07-11 0:47 ` Scott Wood [this message]
2012-07-11 0:54 ` Benjamin Herrenschmidt
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