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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sat, 09 Jul 2016 13:42:27 +1000
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Subject: Re: [Qemu-devel] [PATCH v2] ppc: Fix support for odd MSR
 combinations
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To: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, David Gibson <david@gibson.dropbear.id.au>, peter.maydell@linaro.org
Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, =?ISO-8859-1?Q?C=E9dric?= Le Goater <clg@kaod.org>

On Sat, 2016-07-09 at 13:41 +1000, Benjamin Herrenschmidt wrote:
> MacOS uses an architecturally illegal MSR combination that
> seems nonetheless supported by 32-bit processors, which is
> to have MSR[PR]=1 and one or more of MSR[DR/IR/EE]=0.
> 
> This adds support for it. To work properly we need to also
> properly include support for PR=1,{I,D}R=0 to the MMU index
> used by the qemu TLB.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Note Mark that with this patch on top of the dbdma series (which I did
manage to find in your repository :-), my OSX 9.2.2 installer now boots
without any hangs.

Cheers,
Ben.