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Re: [PATCH v2] hw/arm/virt: KVM: Enable PAuth when supported by the host
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From: |
Marc Zyngier |
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Subject: |
Re: [PATCH v2] hw/arm/virt: KVM: Enable PAuth when supported by the host |
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Date: |
Thu, 06 Jan 2022 19:25:42 +0000 |
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User-agent: |
Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (Gojō) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) |
On Thu, 06 Jan 2022 18:26:29 +0000,
Richard Henderson <richard.henderson@linaro.org> wrote:
>
> Mm. It does beg the question of why KVM exposes multiple bits. If
> they must be tied, then it only serves to make the interface more
> complicated than necessary. We would be better served to have a
> single bit to control all of PAuth.
In hindsight, there is a lot I would change in the KVM userspace ABI,
and a lot I should have pushed back on. Unfortunately, there is little
we can do now to fix it (userspace expecting this behaviour has been
in the wild for almost 3 years already).
M.
--
Without deviation from the norm, progress is not possible.