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Re: [PATCH v3 25/28] arm64/sve: Detect SVE and activate runtime support

From: Suzuki K Poulose <Suzuki dot Poulose at arm dot com>
To: Dave Martin <Dave dot Martin at arm dot com>, linux-arm-kernel at lists dot infradead dot org
Cc: Catalin Marinas <catalin dot marinas at arm dot com>, Will Deacon <will dot deacon at arm dot com>, Ard Biesheuvel <ard dot biesheuvel at linaro dot org>, Alex Bennée <alex dot bennee at linaro dot org>, Szabolcs Nagy <szabolcs dot nagy at arm dot com>, Richard Sandiford <richard dot sandiford at arm dot com>, Okamoto Takayuki <tokamoto at jp dot fujitsu dot com>, kvmarm at lists dot cs dot columbia dot edu, libc-alpha at sourceware dot org, linux-arch at vger dot kernel dot org
Date: Wed, 11 Oct 2017 18:11:48 +0100
Subject: Re: [PATCH v3 25/28] arm64/sve: Detect SVE and activate runtime support
Authentication-results: sourceware.org; auth=none
References: <1507660725-7986-1-git-send-email-Dave.Martin@arm.com> <1507660725-7986-26-git-send-email-Dave.Martin@arm.com>

On 10/10/17 19:38, Dave Martin wrote:

This patch enables detection of hardware SVE support via the
cpufeatures framework, and reports its presence to the kernel and
userspace via the new ARM64_SVE cpucap and HWCAP_SVE hwcap
respectively.

Userspace can also detect SVE using ID_AA64PFR0_EL1, using the
cpufeatures MRS emulation.

When running on hardware that supports SVE, this enables runtime
kernel support for SVE, and allows user tasks to execute SVE
instructions and make of the of the SVE-specific user/kernel
interface extensions implemented by this series.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>


Looks good to me.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

References:
- [PATCH v3 00/28] ARM Scalable Vector Extension (SVE)
  - From: Dave Martin
- [PATCH v3 25/28] arm64/sve: Detect SVE and activate runtime support
  - From: Dave Martin

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