From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: "Mikołaj Lenczewski" <miko.lenczewski@arm.com>,
ryan.roberts@arm.com, yang@os.amperecomputing.com,
catalin.marinas@arm.com, will@kernel.org,
jean-philippe@linaro.org, robin.murphy@arm.com, joro@8bytes.org,
maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com,
james.morse@arm.com, broonie@kernel.org, ardb@kernel.org,
baohua@kernel.org, david@redhat.com, jgg@ziepe.ca,
nicolinc@nvidia.com, jsnitsel@redhat.com, mshavit@google.com,
kevin.tian@intel.com, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, iommu@lists.linux.dev
Subject: Re: [PATCH v7 1/4] arm64: cpufeature: Introduce MATCH_ALL_EARLY_CPUS capability type
Date: Tue, 17 Jun 2025 11:20:32 +0100 [thread overview]
Message-ID: <4b74ff9d-7451-4c11-b9ad-66ffd83fd2d2@arm.com> (raw)
In-Reply-To: <20250617095104.6772-2-miko.lenczewski@arm.com>
On 17/06/2025 10:51, Mikołaj Lenczewski wrote:
> From: Catalin Marinas <catalin.marinas@arm.com>
>
> For system-wide capabilities, the kernel has the SCOPE_SYSTEM type. Such
> capabilities are checked once the SMP boot has completed using the
> sanitised ID registers. However, there is a need for a new capability
> type similar in scope to the system one but with checking performed
> locally on each CPU during boot (e.g. based on MIDR_EL1 which is not a
> sanitised register).
>
> Introduce ARM64_CPUCAP_MATCH_ALL_EARLY_CPUS which, together with
> ARM64_CPUCAP_SCOPE_LOCAL_CPU, ensures that such capability is enabled
> only if all early CPUs have it. For ease of use, define
> ARM64_CPUCAP_EARLY_LOCAL_CPU_FEATURE which combines SCOPE_LOCAL_CPU,
> PERMITTED_FOR_LATE_CPUS and MATCH_ALL_EARLY_CPUS.
>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Signed-off-by: Mikołaj Lenczewski <miko.lenczewski@arm.com>
> Cc: Suzuki K Poulose <Suzuki.Poulose@arm.com>
> ---
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
next prev parent reply other threads:[~2025-06-17 10:32 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-17 9:51 [PATCH v7 0/4] Initial BBML2 support for contpte_convert() Mikołaj Lenczewski
2025-06-17 9:51 ` [PATCH v7 1/4] arm64: cpufeature: Introduce MATCH_ALL_EARLY_CPUS capability type Mikołaj Lenczewski
2025-06-17 10:20 ` Suzuki K Poulose [this message]
2025-06-17 9:51 ` [PATCH v7 2/4] arm64: Add BBM Level 2 cpu feature Mikołaj Lenczewski
2025-06-17 10:35 ` Suzuki K Poulose
2025-06-18 14:07 ` Ryan Roberts
2025-06-19 8:57 ` Mikołaj Lenczewski
2025-06-19 9:20 ` Ryan Roberts
2025-06-19 11:51 ` Mikołaj Lenczewski
2025-06-19 11:05 ` Catalin Marinas
2025-06-19 11:51 ` Mikołaj Lenczewski
2025-06-19 13:46 ` Catalin Marinas
2025-06-19 14:46 ` Mikołaj Lenczewski
2025-06-17 9:51 ` [PATCH v7 3/4] iommu/arm: Add BBM Level 2 smmu feature Mikołaj Lenczewski
2025-06-19 11:36 ` Catalin Marinas
2025-06-17 9:51 ` [PATCH v7 4/4] arm64/mm: Elide tlbi in contpte_convert() under BBML2 Mikołaj Lenczewski
2025-06-19 19:29 ` Catalin Marinas
2025-06-19 19:47 ` Catalin Marinas
2025-06-20 16:10 ` Ryan Roberts
2025-06-25 13:07 ` Ryan Roberts
2025-06-25 13:37 ` Jason Gunthorpe
2025-06-25 14:16 ` Ryan Roberts
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