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From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-ID: <f4bd9889-6cf9-923f-7123-84fe9ca9a2de@ilande.co.uk>
Date: Sat, 9 Jul 2016 10:56:20 +0100
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Subject: Re: [Qemu-devel] [PATCH v2] ppc: Fix support for odd MSR
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To: Benjamin Herrenschmidt <benh@kernel.crashing.org>, David Gibson <david@gibson.dropbear.id.au>, peter.maydell@linaro.org
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org, =?UTF-8?Q?C=c3=a9dric_Le_Goater?= <clg@kaod.org>

On 09/07/16 04:42, Benjamin Herrenschmidt wrote:

> 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.

Wow, just wow. This fixes the hard lockup after disk initialization I
was seeing with OS 9.2.2, and I've just done a complete install and boot
cycle of both OS 9.2.1 and OS 9.2.2 with no issues.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>


ATB,

Mark.