Messages in this thread | | | Date | Mon, 27 Nov 2017 23:39:40 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 1/5] x86/mm/kaiser: Alternative ESPFIX |
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On Mon, Nov 27, 2017 at 11:31:11PM +0100, Peter Zijlstra wrote: > Change the asm to do the CR3 switcheroo so we can remove the magic > mappings. > > Since RDI is unused after SWAPGS we can use it as a scratch reg for > SWITCH_TO_KERNEL. And once we've computed the new RSP (in RAX) we no > longer need RDI and can again use it as scratch reg for > SWITCH_TO_USER.
Forgot to note; this passes tools/testing/selftests/x86/sigreturn_64.
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
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