Re: [Qemu-devel] [PATCH 1/2] target-i386: emulate CPUID level of real hardware

[Radim Krčmář]

2015-06-18 17:29+0200, Paolo Bonzini:
> On 18/06/2015 17:24, Radim Krčmář wrote:
> > W10 insider has a bug where it ignores CPUID level and interprets
> > CPUID.(EAX=07H, ECX=0H) incorrectly, because CPUID in fact returned
> > CPUID.(EAX=04H, ECX=0H);  this resulted in execution of unsupported
> > instructions.
> > 
> > While it's a Windows bug, there is no reason to emulate incorrect level;
> > and amend xlevel while at it.
> > 
> > I have used http://instlatx64.atw.hu/ as a source of CPUID and checked
> > that it matches Penryn Xeon X5472, Westmere Xeon W3520, SandyBridge
> > i5-2540M, and Haswell i5-4670T.
> > 
> > kvm64 and qemu64 were bumped to 0xD to avoid similar problems.
> 
> This unfortunately has to be done only for new machine types.  Old types
> will remain buggy forever.

Ah, ok, which machine type should I target, 2.4?
And is patch 2 is only supposed to work with new machine types?

Thanks.