linux-kernel - Re: [PATCH v2 2/2] Documentation/vmcoreinfo: Add documentation for 'KERNELPACMASK'

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Message-ID: <20200504173440.GE1833@willie-the-truck>
Date:   Mon, 4 May 2020 18:34:41 +0100
From:   Will Deacon <will@...nel.org>
To:     Amit Daniel Kachhap <amit.kachhap@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        Vincenzo Frascino <Vincenzo.Frascino@....com>,
        James Morse <james.morse@....com>,
        Mark Rutland <mark.rutland@....com>,
        Dave Young <dyoung@...hat.com>, Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH v2 2/2] Documentation/vmcoreinfo: Add documentation for
 'KERNELPACMASK'

On Mon, Apr 27, 2020 at 11:55:02AM +0530, Amit Daniel Kachhap wrote:
> Add documentation for KERNELPACMASK variable being added to the vmcoreinfo.
> 
> It indicates the PAC bits mask information of signed kernel pointers if
> Armv8.3-A Pointer Authentication feature is present.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Dave Young <dyoung@...hat.com>
> Cc: Baoquan He <bhe@...hat.com>
> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@....com>
> ---
>  Documentation/admin-guide/kdump/vmcoreinfo.rst | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
> index 007a6b8..5cc3ee6 100644
> --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
> +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
> @@ -393,6 +393,12 @@ KERNELOFFSET
>  The kernel randomization offset. Used to compute the page offset. If
>  KASLR is disabled, this value is zero.
>  
> +KERNELPACMASK
> +-------------
> +
> +Indicates the PAC bits mask information if Pointer Authentication is
> +enabled and address authentication feature is present.

This is a bit cryptic. How about:

  The mask to extract the Pointer Authentication Code from a kernel virtual
  address.

Will