hpa pointed out that the ABI that I chose (an MSR from the KVM range and a KVM cpuid bit) is unnecessarily KVM-specific. It would be nice to allocate an MSR that everyone involved can agree on and, rather than relying on a cpuid bit, just have the guest probe for the MSR.
This leads to a few questions: 1. How do we allocate an MSR? (For background, this would be an MSR that either returns 64 bits of best-effort cryptographically secure random data or fails with #GP.) 2. For KVM, what's the right way to allow QEMU to turn the feature on and off? Is this even necessary? KVM currently doesn't seem to allow QEMU to turn any of its MSRs off; it just allows QEMU to ask it to stop advertising support. 3. QEMU people, can you please fix your RDMSR emulation to send #GP on failure? I can work around it for this MSR in the Linux code, but for Pete's sake... :( Thanks, Andy _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
