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Re: [PATCH v2 0/2] MTE support for KVM guest

From: Richard Henderson
Subject: Re: [PATCH v2 0/2] MTE support for KVM guest
Date: Thu, 10 Sep 2020 08:36:44 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 9/10/20 3:24 AM, Steven Price wrote:
> It is a shame, however I suspect this is because to use those instructions you
> need to know the block size held in GMID_EL1. And at least in theory that 
> could
> vary between CPUs.

Which is no different from having to read DCZID_EL0 in order to implement
memset, in my opinion.  But, whatever.

> When we have some real hardware it would be worth profiling this. At the 
> moment
> I've no idea whether the kernel entry overhead would make such an interface
> useful from a performance perspective or not.



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