[Qemu-devel] USE_CODE_COPY

[Qemu-devel] USE_CODE_COPY

[Petros Efstathopoulos]

Hi all.

I was looking at the qemu dynamic rewriting code for system emulation 
(and NOT running user level processes). Is direct copying 
(USE_CODE_COPY) ever used? It looks to me that it's not, since the 
softmmu is always used...

I am mostly interested in the X86_64 target.

thanks,
-Petros.

Re: [Qemu-devel] USE_CODE_COPY

[Fabrice Bellard]

Hi,

USE_CODE_COPY is only used for user level emulation. My current plan is 
to remove this code ASAP because it adds too much complexity to QEMU and 
has little use.

IMHO it is more useful to concentrate on making the x86 target more 
accurate (e.g. FPU support in SOFT_FLOAT mode, full segment checks, SMI 
mode) while being totally independent of the x86 host.

The case where performance is needed can be handled more efficiently by 
using kqemu or qvm86.

Regards,

Fabrice.


Petros Efstathopoulos wrote:
> Hi all.
> 
> I was looking at the qemu dynamic rewriting code for system emulation 
> (and NOT running user level processes). Is direct copying 
> (USE_CODE_COPY) ever used? It looks to me that it's not, since the 
> softmmu is always used...
> 
> I am mostly interested in the X86_64 target.
> 
> thanks,
> -Petros.
> 
> 
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