On Tue, Nov 28, 2017 at 09:13:18AM -0800, Sean Christopherson wrote: > On Sat, 2017-11-25 at 21:29 +0200, Jarkko Sakkinen wrote: > > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > > > > When IA32_FEATURE_CONTROL.SGX_ENABLE and IA32_FEATURE_CONTROL.LOCK are > > set by the pre-boot firmware, SGX is usable by the OS. > > This implies that only pre-boot firmware can write feature control, which is not > true. What about: > > SGX instructions (ENCLS and ENCLU) are usable if and only if SGX_ENABLE is > set in the IA32_FEATURE_CONTROL MSR and said MSR is locked. You are correct, thanks. I'll fix this for v7. /Jarkko
