On Thu, Dec 07, 2017 at 07:30:48AM +0100, Ingo Molnar wrote: > > We also need a small stack in the trampoline to re-enable long mode via > > long return. But stack and code can share the page just fine. > > BTW., I'm not sure this is necessarily a good idea: it means > writable+executable > memory, which we generally try to avoid. How complicated would it be to have > them > separate?
It's trivial: you only need to bump TRAMPOLINE_32BIT_SIZE. But it doesn't make much sense. We're running from indentity mapping: all memory is r/w without NX bit set (and IA32_EFER.NXE is 0). -- Kirill A. Shutemov
