Messages in this thread | | | Date | Tue, 31 May 2011 14:54:15 +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:
> [...] More importantly, vread_tsc contains an alternative and the > vDSO can't currently contain alternative instructions. That can > probably be fixed, but it'll take a bit of work.
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.
Thanks,
Ingo
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