2018-03-22 20:38 GMT+08:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > On 22/03/2018 12:04, Andrew Cooper wrote: >> We've got a Force Emulation Prefix (ud2a; .ascii "xen") for doing >> magic. Originally, this was used for PV guests to explicitly request an >> emulated CPUID, but I extended it to HVM guests for "emulate the next >> instruction", after we had some guest user => guest kernel privilege >> escalations because of incorrect emulation. > > Wanpeng, why don't you add it behind a new kvm module parameter? :) Great point! I will have a try. Thanks Paolo and Andrew. :) Regards, Wanpeng Li
