From: Dave Martin <Dave.Martin@arm.com>
To: Yeoreum Yun <yeoreum.yun@arm.com>
Cc: catalin.marinas@arm.com, will@kernel.org, broonie@kernel.org,
oliver.upton@linux.dev, anshuman.khandual@arm.com,
robh@kernel.org, james.morse@arm.com, mark.rutland@arm.com,
joey.gouly@arm.com, ahmed.genidi@arm.com, kevin.brodsky@arm.com,
scott@os.amperecomputing.com, mbenes@suse.cz,
james.clark@linaro.org, frederic@kernel.org, rafael@kernel.org,
pavel@kernel.org, ryan.roberts@arm.com, suzuki.poulose@arm.com,
maz@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
kvmarm@lists.linux.dev
Subject: Re: [PATCH v4 0/5] initialize SCTRL2_ELx
Date: Mon, 1 Sep 2025 16:18:16 +0100 [thread overview]
Message-ID: <aLW5OIgv8/bvvY9E@e133380.arm.com> (raw)
In-Reply-To: <20250821172408.2101870-1-yeoreum.yun@arm.com>
Hi,
On Thu, Aug 21, 2025 at 06:24:03PM +0100, Yeoreum Yun wrote:
> This series introduces initial support for the SCTLR2_ELx registers in Linux.
> The feature is optional starting from ARMv8.8/ARMv9.3,
> and becomes mandatory from ARMv8.9/ARMv9.4.
>
> Currently, Linux has no strict need to modify SCTLR2_ELx--
> at least assuming that firmware initializes
> these registers to reasonable defaults.
>
> However, several upcoming architectural features will require configuring
> control bits in these registers.
> Notable examples include FEAT_PAuth_LR and FEAT_CPA2.
This looks OK to me now, except for one or two minor issues (see
replies to the patches).
I think we will need a way of testing all the code paths before this
should be merged, though.
Have you tested all the code paths, or are there some things that have
not been tested?
Since this code is not useful by itself, it may make sense to delay
merging it until we have patches for a feature that depends on SCTLR2.
Cheers
---Dave
next prev parent reply other threads:[~2025-09-01 23:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-21 17:24 [PATCH v4 0/5] initialize SCTRL2_ELx Yeoreum Yun
2025-08-21 17:24 ` [PATCH v4 1/5] arm64: make SCTLR2_EL1 accessible Yeoreum Yun
2025-08-21 17:24 ` [PATCH v4 2/5] arm64: initialise SCTLR2_ELx register at boot time Yeoreum Yun
2025-09-01 15:13 ` Dave Martin
2025-09-01 18:29 ` Yeoreum Yun
2025-09-02 10:39 ` Dave Martin
2025-09-02 11:05 ` Yeoreum Yun
2025-09-03 10:43 ` Dave Martin
2025-09-03 10:59 ` Yeoreum Yun
2025-08-21 17:24 ` [PATCH v4 3/5] arm64: save/restore SCTLR2_EL1 when cpu_suspend()/resume() Yeoreum Yun
2025-08-21 17:24 ` [PATCH v4 4/5] arm64: initialise SCTLR2_EL1 at cpu_soft_restart() Yeoreum Yun
2025-09-01 15:13 ` Dave Martin
2025-09-01 18:33 ` Yeoreum Yun
2025-08-21 17:24 ` [PATCH v4 5/5] arm64: make the per-task SCTLR2_EL1 Yeoreum Yun
2025-09-01 10:08 ` [PATCH v4 0/5] initialize SCTRL2_ELx Yeoreum Yun
2025-09-01 15:18 ` Dave Martin [this message]
2025-09-01 18:17 ` Yeoreum Yun
2025-09-03 10:52 ` Dave Martin
2025-09-03 12:08 ` Yeoreum Yun
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