Messages in this thread | | | Date | Tue, 2 Nov 2021 15:27:23 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH V4 04/50] x86/xen: Add xenpv_restore_regs_and_return_to_usermode() |
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On Tue, Nov 02, 2021 at 12:22:50PM +0100, H. Peter Anvin wrote: > It would be interesting to have an "override function with jmp" > alternatives macro. It doesn't require any changes to the alternatives > mechanism proper (but possibly to objtool): it would just insert an > alternatives entry without adding any code including nops to the main > path. It would of course only be applicable to a jmp, so a syntax like > OVERRIDE_JMP feature, target rather than open-coding the instruction > would probably be a good idea.
I think you wanna say ALTERNATIVE_JMP here seeing how we have ALTERNATIVE_CALL already :)
As to marking it properly, we can finally add that struct alt_instr.flags thing we have been trying to add for years now.
/me adds it to his evergrowing todo.
If anyone beats /me to it, /me will gladly have a look at it.
-- Regards/Gruss, Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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