Re: [Qemu-devel] -kernel-kqemu

[Anthony Liguori <aliguori@us.ibm.com>]

Hetz Ben Hamo wrote:
> Hi,
>
> I´m sorry, but I´ve been following the CVS commits and I haven´t
> understood this new option (fabrice has not written anything to this
> list about it and what it does for the end user).
>
> Could someone please shed some light for me and others who didn´t
> understand whats going on please?
>   
I can take a stab although hopefully Fabrice will post something in the 
near future..

kqemu and qvm86 allow ring 3 code to run on bare metal.  For ring 0 
code, both defer to qemu which does binary translation.

-kernel-kqemu allows portions of ring 0 code to run on bare metal.  
Presumably, this means kqemu now has a block scanner and can determine 
whether or not a block contains sensitive instructions.  It could be 
interpreting those blocks or it may just always return to qemu--it's 
unclear since kqemu is not open source.

The changes in qemu just allow for kqemu to try and execute ring 0 code 
it seems.  All the interesting changes are probably in kqemu itself...

Regards,

Anthony Liguori
> Thanks,
> Hetz
>
> On 2/9/06, Jim C. Brown <jma5@umd.edu> wrote:
>   
>> On Wed, Feb 08, 2006 at 06:04:35PM -0500, Jim C. Brown wrote:
>>     
>>> This sounds like an interesting option. Qemu has moved one step closer to
>>> VMware...
>>>
>>>       
>> I should probably add, that this new option (-kernel-kqemu) allows for speeds
>> very close to VMware because it allows kqemu to virtualize most ring 0 code
>> (in addition to ring 3 code).
>>
>> Can't wait to see qvm86 make use of the new API.
>>
>>     
>>> --
>>> Infinite complexity begets infinite beauty.
>>> Infinite precision begets infinite perfection.
>>>
>>>
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>>>       
>> --
>> Infinite complexity begets infinite beauty.
>> Infinite precision begets infinite perfection.
>>
>>
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>>     
>
>
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