* Tom Lendacky <thomas.lenda...@amd.com> wrote:
> This patch series provides support for AMD's new Secure Memory Encryption
> (SME)
> feature.
I'm wondering, what's the typical performance hit to DRAM access latency when
SME
is enabled?
On that same note, if the performance hit is noticeable I'd expect SME to not
be
enabled in native kernels typically - but still it looks like a useful hardware
feature. Since it's controlled at the page table level, have you considered
allowing SME-activated vmas via mmap(), even on kernels that are otherwise not
using encrypted DRAM?
One would think that putting encryption keys into such encrypted RAM regions
would
generally improve robustness against various physical space attacks that want
to
extract keys but don't have full control of the CPU.
Thanks,
Ingo
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