From mboxrd@z Thu Jan  1 00:00:00 1970
From: Scott Wood <scottwood@freescale.com>
Subject: Re: [RFC][KVM][PATCH 1/1] kvm:ppc:booke-64: soft-disable interrupts
Date: Thu, 9 May 2013 17:13:03 -0500
Message-ID: <1368137583.654.15@snotra>
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Cc: Wood Scott-B07421 <B07421@freescale.com>,
 "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
 Caraman Mihai Claudiu-B02008 <B02008@freescale.com>,
 "agraf@suse.de" <agraf@suse.de>,
 "kvm-ppc@vger.kernel.org" <kvm-ppc@vger.kernel.org>,
 "tiejun.chen" <tiejun.chen@windriver.com>,
 Bhushan Bharat-R65777 <R65777@freescale.com>,
 "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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In-Reply-To: <1368137220.3715.14.camel@pasglop> (from
 benh@kernel.crashing.org on Thu May  9 17:07:00 2013)
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On 05/09/2013 05:07:00 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2013-05-09 at 16:27 -0500, Scott Wood wrote:
> > On 05/09/2013 07:37:42 AM, Benjamin Herrenschmidt wrote:
> > > On Thu, 2013-05-09 at 17:44 +0800, tiejun.chen wrote:
> > > >
> > > > Actually in the case GS=1 even if EE=0, EXT/DEC/DBELL still  
> occur
> > > as I
> > > > recall.
> > >
> > > Only if directed to the hypervisor.
> >
> > This is always the case with KVM, right?  At least on booke...
> 
> Hrm, on A2 we could choose iirc. Well not DEC but EXT at least, I  
> don't
> remember about DBELL.

As for as the hardware goes we can choose on e500mc as well -- we just  
don't support it in KVM, because we can't distinguish between guest and  
host interrupts without routing the latter to critical, which is way  
too much of a pain for Linux (we did it in our standalone hypervisor,  
though).

-Scott