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Re: [Qemu-devel] International Virtualization Conference


From: Joshua Root
Subject: Re: [Qemu-devel] International Virtualization Conference
Date: Tue, 10 Oct 2006 19:26:08 +1000
User-agent: Thunderbird 1.5.0.7 (Macintosh/20060909)

Rob Landley wrote:
> On Sunday 08 October 2006 10:36 am, Jim C. Brown wrote:
>> qemu is primarily a dynamic translator not a virtualizer.
> 
> That's an implementation detail.  The end result is running programs in a 
> virtual environment, and qemu's system emulation has lots of virtual hardware 
> it attaches to virtual busses, which it performs virtual I/O to, even 
> simulating the delivery of virtual interrupts to signal completion of virtual 
> DMA.

Part of the generally accepted definition of virtualization is that the
majority of guest instructions execute directly on the real CPU with no
intervention by the VMM. QEMU + qvm86 does count as virtualization if
the system spends most of its time in user mode; QEMU on its own does
not (you run code that is very different to the original binary).

- Josh




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