linux-kernel - Re: [PATCH v6 04/13] arm64/kvm: hide ptrauth from guests

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Message-ID: <1f179017-4237-0d36-7adc-0a1470b5fd46@linaro.org>
Date:   Mon, 10 Dec 2018 14:22:00 -0600
From:   Richard Henderson <richard.henderson@...aro.org>
To:     Kristina Martsenko <kristina.martsenko@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Adam Wallis <awallis@...eaurora.org>,
        Amit Kachhap <amit.kachhap@....com>,
        Andrew Jones <drjones@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave P Martin <dave.martin@....com>,
        Jacob Bramley <jacob.bramley@....com>,
        Kees Cook <keescook@...omium.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ramana Radhakrishnan <ramana.radhakrishnan@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will.deacon@....com>,
        kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 04/13] arm64/kvm: hide ptrauth from guests

On 12/10/18 2:12 PM, Kristina Martsenko wrote:
> The plan was to disable trapping, yes. However, after that thread there
> was a retrospective change applied to the architecture, such that the
> XPACLRI (and XPACD/XPACI) instructions are no longer trapped by
> HCR_EL2.API. (The public documentation on this has not been updated
> yet.) This means that no HINT-space instructions should trap anymore.

Ah, thanks for the update.  I'll update my QEMU patch set.

>> It seems like the header comment here, and
> Sorry, which header comment?

Sorry, the patch commit message.


r~