2018-03-13 2:28 GMT+08:00 Christopherson, Sean J <sean.j.christopherson@xxxxxxxxx>: > On Sunday, 2018-03-11, Wanpeng Li <kernellwp@xxxxxxxxx> wrote: >> 2018-03-06 4:04 GMT+08:00 Sean Christopherson <sean.j.christopherson@xxxxxxxxx>: >> > This series eliminates usage of legacy code that is obsolete when >> > unrestricted guest is enabled. >> > >> > Because unrestricted guest (Westmere) was introduced one generation >> > later than EPT (Nehalem), KVM's initial support for EPT by necessity >> > retained/introduced soon-to-be-legacy code for handling a guest with >> > EPT enabled and CR0.PG/PE==0. Some of this now-legacy code/behavior >> > wasn't correctly deprecated when KVM added support for unrestricted >> > guest, e.g. KVM still creates and loads identity mapped IA32 page >> > tables when the guest disables paging, even though CR0.PG is cleared >> > in hardware. >> >> Thanks for the patchset, in addition, I think A20 emulation is still >> missing for vm8086. > > Missing in the sense that you want to be able to emulate A20M behavior > in KVM, i.e. run a guest with A20M asserted? I mean the guest maybe access the address > 1MB in vm8086 and the kvm doesn't support address-wraparound that occurs at 1MByte. Regards, Wanpeng Li
