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Re: [Qemu-ppc] [HelenOS-devel] Regression in ppc-softmmu when running He

From: Alexander Graf
Subject: Re: [Qemu-ppc] [HelenOS-devel] Regression in ppc-softmmu when running HelenOS
Date: Mon, 16 Apr 2012 14:09:48 +0200

On 16.04.2012, at 14:07, Alexander Graf wrote:

> On 17.03.2012, at 19:09, Mark Cave-Ayland wrote:
>> On 17/03/12 17:28, Martin Sucha wrote:
>> Hi Martin,
>>> Hello Mark,
>>> On Friday 16 March 2012 00:03:21 Mark Cave-Ayland wrote:
>>>> Please find attached the latest version of my patch which seems to have
>>>> the same behaviour as git master, except that it now also boots HelenOS.
>>>> This is based upon the PowerISA reference link you pointed me towards.
>>>> I've also clarified the comments to make it clearer where the masks have
>>>> been calculated from, plus modified it so (I hope) it will also work on
>>>> PPC64.
>>>> Any feedback/review/testing greatly appreciated.
>>> Using (a slightly modified version of) your qemu-ppc-v3.patch:
>>> -+    new_msr = env->msr&  ~0xed36ULL&  ~((target_ulong)1<<  MSR_HVB);
>>> ++    new_msr = env->msr&  ~0xed36ULL&  ~((target_ulong) MSR_HVB);
>> Ah I see - the MSR_HVB constant is already shifted. Good catch!
> Sorry for the late reply - I was on vacation for the last almost 4 weeks :).
> Either way, the breakage you're seeing is _not_ due to the MSR value exposed 
> to the guest OS. It's because we're not flushing the TLB correctly when going 
> into real mode. Please try the below patch which should also make things work.

Ugh. Looks like someone already fixed that one :). Sorry for the fuss.


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