On Tue, Aug 10, 2021 at 10:36:21AM -0700, Dave Hansen wrote: > > The difference is going to be substantially lower once we get it optimized > > properly. > > What does this mean? Is this future work in the kernel or somewhere in > the TDX hardware/firmware which will speed things up? Kernel has to be changed to accept memory in 2M and 1G chunks where possible. The interface exists and described in spec, but not yet used in guest kernel. It would cut hypercall overhead dramatically. It makes upfront memory accept more bearable and lowers latency of lazy memory accept. So I expect the gap being not 20x, but like 3-5x (which is still huge). -- Kirill A. Shutemov
