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Mon, 04 Aug 2025 13:37:24 +0100 Date: Mon, 04 Aug 2025 13:37:23 +0100 Message-ID: <86qzxr6z5o.wl-maz@kernel.org> From: Marc Zyngier To: Yeoreum Yun 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, ry111@xry111.site, Dave.Martin@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, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, kvmarm@lists.linux.dev Subject: Re: [PATCH 00/11] support SCTLR2_ELx In-Reply-To: <20250804121724.3681531-1-yeoreum.yun@arm.com> References: <20250804121724.3681531-1-yeoreum.yun@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: yeoreum.yun@arm.com, 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, ry111@xry111.site, Dave.Martin@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, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, kvmarm@lists.linux.dev X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Mon, 04 Aug 2025 13:17:13 +0100, Yeoreum Yun wrote: >=20 > This series introduces initial support for the SCTLR2_ELx registers in Li= nux. > The feature is optional starting from ARMv8.8/ARMv9.3, > and becomes mandatory from ARMv8.9/ARMv9.4. >=20 > Currently, Linux has no strict need to modify SCTLR2_ELx=E2=80=94 > at least assuming that firmware initializes > these registers to reasonable defaults. >=20 > However, several upcoming architectural features will require configuring > control bits in these registers. > Notable examples include FEAT_PAuth_LR and FEAT_CPA2. >=20 > This series is based on v6.16 and probably KVM-safe but > Not tested yet: > - nVHE boot. "Probably" and "Not tested yet" are not exactly what we are looking for when looking at a series that adds support for a new architectural feature. Also, a lot of the KVM patches are redundant now that we do have FEAT_SCTLR2 support in KVM (see what has been merged for 6.17). You probably want to rebase on -rc1 once it is released, which should cut the series by half. Thanks, M. --=20 Without deviation from the norm, progress is not possible.