[Cc qemu-devel as we've gone off-topic] 2017-04-04 15:15+0200, Alexander Graf: > On 04/04/2017 03:13 PM, Radim Krčmář wrote: >> 2017-04-04 14:51+0200, Alexander Graf: >> > Please see my patch to force enable CPUID bits ;). >> Nice. MWAIT could also use setting of arbitrary values for its leaf, >> but a generic interface for that would probably look clunky on the >> command line ... > > > I think we should have an interface similar to smbios for that eventually. > Something where you can explicitly set arbitrary CPUID leaf information > using leaf specific syntax. There are more leafs where it would make sense - > cache topology for example. Right, separating cpuid from -cpu makes it bearable, like -cpuid leaf=%x[,subleaf=%x][,eax=%x][,ebx=%x][,ecx=%x][,edx=%x] And Having multiple interfaces for the same thing would result in some corner case decisions ... I think QEMU should check that feature flags specified flags specified by -cpu are not cleared by -cpuid. I'm not sure if setters like "|=" and "&=~" would be beneficial in some cases.
