On Tue, Mar 20, 2018 at 03:32:27PM -0300, Eduardo Habkost wrote: > The difference between both approaches is that checking just > has_msr_hv_* would let a non-cooperating guest prevent itself > from being migrated to an older host by writing a non-zero value > to a MSR, even if hyperv support was not enabled in the VM > configuration at all. I don't think we want that.
Thinking some more of what we do want in this regard, I wonder if we're doing the right thing by not generating #GP on access to MSRs whose support is present in KVM but disabled via cpu properties in QEMU? Roman.
