Messages in this thread | | | Date | Thu, 4 Jan 2018 21:39:24 +0100 (CET) | From | Jiri Kosina <> | Subject | Re: [RFC PATCH] asm/generic: introduce if_nospec and nospec_barrier |
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On Thu, 4 Jan 2018, Alan Cox wrote:
> You never go from one user process to another except via the kernel. We > have no hardware scheduling going on. That means that if the kernel > and/or CPU imposes the correct speculation barriers you can't attack > anyone but yourself.
So how does this work on HT with the shared BTB? There is no context switch (and hence no IBPB) happening between the threads sharing it.
-- Jiri Kosina SUSE Labs
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