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SubjectRe: [kernel-hardening] Re: [RFC, PATCH] x86_64: KAISER - do not map kernel in user mode
Daniel,

On Fri, May 5, 2017 at 9:40 AM, Daniel Gruss
<daniel.gruss@iaik.tugraz.at> wrote:
> I'm sure the overhead on older systems is larger than on recent systems.

Just did a quick test on my main KVM host, a 8 core Intel(R) Xeon(R)
CPU E3-1240 V2.
KVM guests are 4.10 w/o CONFIG_KAISER and kvmconfig without CONFIG_PARAVIRT.
Building a defconfig kernel within that guests is about 10% slower
when CONFIG_KAISER
is enabled.

Is this expected?
If it helps I can redo the same test also on bare metal.

--
Thanks,
//richard

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