linux-kernel - Re: [RFC 0/8] arm64/hw_breakpoint: Enable FEAT

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Message-ID: <fec0df6a-c35c-41fe-8b03-de1b15893ff8@arm.com>
Date: Tue, 16 Apr 2024 09:24:17 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Jonathan Corbet <corbet@....net>, Marc Zyngier <maz@...nel.org>,
 Oliver Upton <oliver.upton@...ux.dev>, James Morse <james.morse@....com>,
 Suzuki K Poulose <suzuki.poulose@....com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 Mark Brown <broonie@...nel.org>, Mark Rutland <mark.rutland@....com>,
 kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/8] arm64/hw_breakpoint: Enable FEAT_Debugv8p9

On 4/5/24 13:30, Anshuman Khandual wrote:
> This series enables FEAT_Debugv8p9 thus extending breakpoint and watchpoint
> support upto 64. This has been lightly tested and still work is in progress
> but would like to get some early feedback on the approach.
> 
> Possible impact of context switches while tracing kernel addresses needs to
> be evaluated regarding MDSELR_EL1 access. This series is based on v6.9-rc2.
> 
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Oliver Upton <oliver.upton@...ux.dev>
> Cc: James Morse <james.morse@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Brown <broonie@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: kvmarm@...ts.linux.dev
> Cc: linux-kernel@...r.kernel.org
> 
> Anshuman Khandual (8):
>   arm64/sysreg: Add register fields for MDSELR_EL1
>   arm64/sysreg: Add register fields for HDFGRTR2_EL2
>   arm64/sysreg: Add register fields for HDFGWTR2_EL2
>   arm64/sysreg: Update ID_AA64MMFR0_EL1 register

Since the above patches add and update register definitions related to
HW breakpoints, and have already been reviewed by Mark, will send them
independently.