Micha Moffie wrote: > Running a small app calling cpuid (inside a guest) - it looks like i see > the host cpuid. > Is that correct?
That is correct for ring-3 (user mode) code. The x86 architecture provides no way of intercepting the cpuid instruction and the features we mask off for ring-0 (kernel mode) code (like PAE, AMD64, frequency control, etc) will show up there. In ring-0 we rely on CSAM & PATM to find and patch the cpuid instructions since it is vital that the kernel get the right idea about the hardware. While for ring-3 code scanning the code would be way to costly, and we trade in some correctness for speed (like most of the other VM solution). The cpuid instruction is of course address by VT-x / AMD-V and will not be an issue if you have such hardware and tell VirtualBox to make use of it. Kind Regards, knut _______________________________________________ vbox-dev mailing list [email protected] http://vbox.innotek.de/mailman/listinfo/vbox-dev
