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Date: Tue, 25 Jul 2017 16:12:20 +0100
From: Mark Rutland <>
To: Li Kun <>
Subject: Re: [PATCH 00/11] ARMv8.3 pointer authentication
 userspace support

On Tue, Jul 25, 2017 at 10:12:24PM +0800, Li Kun wrote:
> Hi Mark,


> Could you please give us some information about the impact to
> performance to help us evaluating the influence to the system?

I'm afraid I don't have any performance details to share, as this series
has been developed and tested using models, and the performance impact
of pointer authentication will be very much dependent on the

I have assumed that this shouldn't regress performance on systems
without pointer authentication functionality, but I haven't yet
attempted to verify that.

>From this series, I'd expect the largest cost to be the semi-lazy KVM
context-switch, for guests which are continuously using pointer


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