Re: [patch]pageattr: cache flush before tlb flush

[Andi Kleen]

Shaohua Li <shaohua.li@xxxxxxxxx> writes:

> clflush uses a virtual address but cache line is physical indexed in
> x86. In my understanding, clflush will do some pagetable walk, so doing
> cache flush first should reduce some pagetable walk.

The SDM describes the exact sequence how this should be done.
Linux unfortunately skips one step currently, but it's not a good
idea to diverge even more.

-Andi
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