On Thu, 2018-12-06 at 06:59 -0800, Dave Hansen wrote: > On 12/6/18 3:22 AM, Kirill A. Shutemov wrote: > > > When you say "disable encryption to a page" does the encryption get > > > actually disabled or does the CPU just decrypt it transparently i.e. > > > what happens physically? > > > > Yes, it gets disabled. Physically. It overrides TME encryption. > > I know MKTME itself has a runtime overhead and we expect it to have a > performance impact in the low single digits. Does TME have that > overhead? Presumably MKTME plus no-encryption is not expected to have > the overhead. > > We should probably mention that in the changelogs too. > I believe in terms of hardware crypto overhead MKTME and TME should have the same (except MKTME no- encrypt case?). But MKTME might have additional overhead from software implementation in kernel? Thanks, -Kai
