Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH v2 3/4] arch/x86: Optionally flush L1D on context switch | Date | Wed, 08 Apr 2020 01:49:40 +0200 |
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"Singh, Balbir" <sblbir@amazon.com> writes: > On Tue, 2020-04-07 at 11:26 -0700, Kees Cook wrote: >> On Mon, Apr 06, 2020 at 01:19:45PM +1000, Balbir Singh wrote: >> > Add arch specific prctl()'s to opt-in to the L1D cache on context switch >> > out, the existing mechanisms of tracking prev_mm via cpu_tlbstate is >> > reused. cond_ibpb() is refactored and renamed into cond_mitigation(). >> >> I still think this should be a generic prctl(). If there is a strong >> reason not to do this, can it be described in the commit log here? > > I can move to prctl() if that is what you prefer, the prctl() can then do arch > specific things. I thought in my question around would other arch's like to do > this, I did not hear anything specific, but I am happy to convert the > interface over.
Yes, please. It's just a matter of time that other architectures find this useful. L1D attacks are not restricted to x86 AFAICT.
Thanks,
tglx
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