Date: Tue, 25 Jul 2017 16:12:20 +0100 From: Mark Rutland <mark.rutland@....com> To: Li Kun <hw.likun@...wei.com> Cc: linux-arm-kernel@...ts.infradead.org, arnd@...db.de, catalin.marinas@....com, christoffer.dall@...aro.org, Dave.Martin@....com, jiong.wang@....com, kvmarm@...ts.cs.columbia.edu, linux-arch@...r.kernel.org, marc.zyngier@....com, suzuki.poulose@....com, will.deacon@....com, yao.qi@....com, linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com 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, Hi, > 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 microarchitecture. 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 authentication. Thanks, Mark.
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