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Re: [PATCH 07/20] KVM/MIPS32: Dynamic binary translation of select privi

To: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH 07/20] KVM/MIPS32: Dynamic binary translation of select privileged instructions.
From: Sanjay Lal <sanjayl@kymasys.com>
Date: Fri, 2 Nov 2012 13:00:11 -0400
Cc: kvm@vger.kernel.org, linux-mips@linux-mips.org
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On Nov 1, 2012, at 11:24 AM, Avi Kivity wrote:

> On 10/31/2012 05:19 PM, Sanjay Lal wrote:
>> Currently, the following instructions are translated:
>> - CACHE (indexed)
>> - CACHE (va based): translated to a synci, overkill on D-CACHE operations, 
>> but still much faster than a trap.
>> - mfc0/mtc0: the virtual COP0 registers for the guest are implemented as 2-D 
>> array
>>  [COP#][SEL] and this is mapped into the guest kernel address space @ VA 0x0.
>>  mfc0/mtc0 operations are transformed to load/stores.
>> 
> 
> Seems to be more of binary patching, yes?  Binary translation usually
> involves hiding the translated code so the guest is not able to detect
> that it is patched.

Now that you mention it, I think binary patching would be more applicable.  If 
the "self-aware" guest ever compared the code it would realize that it has 
changed.

Regards
Sanjay



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