On 26.05.2011, at 11:08, Josh Triplett wrote: > qemu currently returns 0 for rdmsr on invalid MSRs, and ignores wrmsr on > invalid MSRs. Real x86 processors GPF on invalid MSRs, which allows > software to detect unavailable MSRs. Emulate this behavior correctly in > qemu. > > Bug discovered via the BIOS Implementation Test Suite > <http://biosbits.org/>; fix tested the same way, for both 32-bit and > 64-bit x86.
This would break a _lot_ of guests that work just fine today, as qemu doesn't handle all the necessary MSRs. Alex