
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. I 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 allow all available features for them (and to avoid the same Windows bug). Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team
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