linux-kernel - Re: [PATCH V8 18/44] x86/fault: Add a PKS test fault hook

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Date:   Mon, 31 Jan 2022 19:56:57 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "hpa@...or.com" <hpa@...or.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V8 18/44] x86/fault: Add a PKS test fault hook

On Thu, 2022-01-27 at 09:54 -0800, ira.weiny@...el.com wrote:
> +                * If a protection key exception occurs it could be
> because a PKS test
> +                * is running.  If so, pks_test_callback() will clear
> the protection
> +                * mechanism and return true to indicate the fault
> was handled.
> +                */
> +               if (pks_test_callback())
> +                       return;

Why do we need both this and pks_handle_key_fault()?