linux-kernel - Re: [RFC PATCH v1 18/28] prctl: arch-agnostic prtcl for indirect branch tracking

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Message-ID: <ZdaYk8XERnOtiR3P@debug.ba.rivosinc.com>
Date: Wed, 21 Feb 2024 16:42:59 -0800
From: Deepak Gupta <debug@...osinc.com>
To: Mark Brown <broonie@...nel.org>
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Subject: Re: [RFC PATCH v1 18/28] prctl: arch-agnostic prtcl for indirect
 branch tracking

On Tue, Feb 06, 2024 at 04:13:39PM +0000, Mark Brown wrote:
>On Wed, Jan 24, 2024 at 10:21:43PM -0800, debug@...osinc.com wrote:
>
>> To allow userspace to enable this feature for itself, following prtcls are
>> defined:
>>  - PR_GET_INDIR_BR_LP_STATUS: Gets current configured status for indirect branch
>>    tracking.
>>  - PR_SET_INDIR_BR_LP_STATUS: Sets a configuration for indirect branch tracking
>>    Following status options are allowed
>>            - PR_INDIR_BR_LP_ENABLE: Enables indirect branch tracking on user
>>              thread.
>>            - PR_INDIR_BR_LP_DISABLE; Disables indirect branch tracking on user
>>              thread.
>>  - PR_LOCK_INDIR_BR_LP_STATUS: Locks configured status for indirect branch
>>    tracking for user thread.
>
>FWIW the arm64 BTI feature is enabled per page of executable memory
>rather than in CPU state so it'd be hard for us to adopt this interface.
>I don't think that's a blocker, just noting it.

Got it, makes sense.