Messages in this thread | | | Subject | Re: [PATCH 1/5] x86/mm/kaiser: Alternative ESPFIX | From | Dave Hansen <> | Date | Mon, 27 Nov 2017 14:41:24 -0800 |
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On 11/27/2017 02:31 PM, 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.
This definitely looks like the right thing. Either I missed something obvious before, or Andy's entry rework made this much more obviously correct to do the simple thing here.
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