[Qemu-devel] x86 system and x86-64 system emulation

[Natalia Portillo]

Hi!

I've just tested a CPU identification program I've made, under QEMU 
(x86 and x86_64 guests).

In QEMU (x86 guest), CPU says it is a "GenuineIntel" Pentium II (family 
6, model 3, stepping 3), but following isn't in concordance:
Pentium II doesn't support nor SSE nor SSE2 and as far as I know also 
doesn't support FXSAVE/FXSTOR operands, and supports Virtual-86 Mode 
Enhacement.
I think that the CPU model information should be updated, or, doing as 
VirtualPC, made it to be a "GenuineQEMU" CPU instead of a 
"GenuineIntel".

In the QEMU (x86-64 guest), CPU says it is a monoprocessor 
"AuthenticAMD" Athlon (family 6, model 2, stepping 3) in standard level 
and in extended level it says it is a multiprocessor non-existent 
"AuthenticAMD" processor (family B, model F, stepping D), and that it 
is an enginering sample.

According to AMD64 Architecture Programmer's Manual, Volume 3, order 
#24594, and to AMD Processor Recognition Application Note, order 
#20734, it should inform of family F in standard and extended level, 
and have an 8-bit brand id in the standard level or an 12-bit brand id 
in the extended level (but not both) informing the exact model of 
processor.

Also there is lacking emulation of 3DNow!, AMD extensions to MMX, a 
more features that is expected every x86-64 processor have.