| From | Andy Lutomirski <> | Date | Mon, 9 Nov 2020 09:38:56 -0800 | Subject | Re: [RFC][PATCH 08/24] x86/entry: Add C version of SWAPGS and SWAPGS_UNSAFE_STACK |
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On Mon, Nov 9, 2020 at 3:22 AM Alexandre Chartre <alexandre.chartre@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.
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