On Mon, Nov 9, 2020 at 3:22 AM Alexandre Chartre <alexandre.char...@oracle.com> wrote: > > SWAPGS and SWAPGS_UNSAFE_STACK are assembly macros. Add C versions > of these macros (swapgs() and swapgs_unsafe_stack()).
This needs a very good justification. It also needs some kind of static verification that these helpers are only used by noinstr code, and they need to be __always_inline. And I cannot fathom how C code could possibly use SWAPGS_UNSAFE_STACK in a meaningful way.
