linux-kernel - Re: [PATCH v6 18/33] prctl: arch-agnostic prctl for indirect branch tracking

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Message-ID: <ZwZjBO_7d2-Qq8bF@finisterre.sirena.org.uk>
Date: Wed, 9 Oct 2024 12:03:32 +0100
From: Mark Brown <broonie@...nel.org>
To: Deepak Gupta <debug@...osinc.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
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Subject: Re: [PATCH v6 18/33] prctl: arch-agnostic prctl for indirect branch
 tracking

On Tue, Oct 08, 2024 at 03:37:00PM -0700, Deepak Gupta wrote:
> Three architectures (x86, aarch64, riscv) have support for indirect branch
> tracking feature in a very similar fashion. On a very high level, indirect
> branch tracking is a CPU feature where CPU tracks branches which uses
> memory operand to perform control transfer in program. As part of this
> tracking on indirect branches, CPU goes in a state where it expects a
> landing pad instr on target and if not found then CPU raises some fault
> (architecture dependent)

Reviewed-by: Mark Brown <broonie@...nel.org>

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