[RFC/RFT PATCH 0/3] arm64: KVM: work around incoherency with uncached guest mappings

On 19/02/2015 18:55, Andrew Jones wrote:

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(I don't have an exact number for how many times it went to EL1 because
 access_mair() doesn't have a trace point.)
(I got the 62873 number by testing a 3rd kernel build that only had patch
 3/3 applied to the base, and counting kvm_toggle_cache events.)
(The number 50 is the number of kvm_toggle_cache events *without* 3/3
 applied.)

I consider this bad news because, even considering it only goes to EL2,
it goes a ton more than it used to. I realize patch 3/3 isn't the final
plan for enabling traps though.

If a full guest boots, can you try timing a kernel compile?

Paolo