On Sat, Nov 3, 2018 at 1:17 AM Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote: > > From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> > > Enumerate Enclave Page Cache (EPC) sections via CPUID and add the data > structures necessary to track EPC pages so that they can be allocated, > freed and managed. As a system may have multiple EPC sections, invoke > CPUID on SGX sub-leafs until an invalid leaf is encountered. > > On NUMA systems, a node can have at most one bank. A bank can be at > most part of two nodes. SGX supports both nodes with a single memory > controller and also sub-cluster nodes with severals memory controllers > on a single die. > > For simplicity, support a maximum of eight EPC sections. Current > client hardware supports only a single section, while upcoming server > hardware will support at most eight sections. Bounding the number of > sections also allows the section ID to be embedded along with a page's > offset in a single unsigned long, enabling easy retrieval of both the > VA and PA for a given page. > + iounmap(section->va); > + section->va = ioremap_cache(addr, size); > + if (!section->va) > + return -ENOMEM; I forgot if it's a place in code on which we discussed ioremap() vs. memremap() call. And I forgot why the conclusion is to leave ioremap(). Sorry, if I'm mistaken. -- With Best Regards, Andy Shevchenko
