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SubjectRe: [PATCH 00/23] KAISER: unmap most of the kernel from userspace page tables
Hi Dave,


On Tue, Oct 31, 2017 at 03:31:46PM -0700, Dave Hansen wrote:
> KAISER makes it harder to defeat KASLR, but makes syscalls and
> interrupts slower. These patches are based on work from a team at
> Graz University of Technology posted here[1]. The major addition is
> support for Intel PCIDs which builds on top of Andy Lutomorski's PCID
> work merged for 4.14. PCIDs make KAISER's overhead very reasonable
> for a wide variety of use cases.

I just wanted to say that I've got a version of this up and running for
arm64. I'm still ironing out a few small details, but I hope to post it
after the merge window. We always use ASIDs, and the perf impact looks
like it aligns roughly with your findings for a PCID-enabled x86 system.



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