Messages in this thread | | | Date | Tue, 31 May 2011 15:11:17 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 0/5] x86-64: Remove syscall instructions at fixed addresses |
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* Andrew Lutomirski <luto@mit.edu> wrote:
> > You could start with picking the more compatible alternative > > instruction initially. I don't at all mind losing half a cycle of > > performance in that case ... this code should be secure first. > > The more compatible one is mfence, which in some cases could (I > think) be a lot more than half a cycle.
I'd still suggest to do the mfence change now and remove the alternatives patching for now - if it's more than half a cycle then it sure will be implemented properly, right?
Thanks,
Ingo
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