From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 167891607B0 for ; Tue, 9 Jul 2024 13:08:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720530531; cv=none; b=t2C5IYci3sgsY9aW+nZENDuhPNUNolmpnJD6bYJQYmNlWGII6vQz7m51Zudol8AjJsxXtdoC1o/jfTSaNLjQDmMiTa9GXmPZS+4/c5p03HEqqabHUQJ5ac/nbfpkUzXsPAOMBq5yUSwl/8tdpZS+wxjnCxpAoqOrfO6YBTejVe8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720530531; c=relaxed/simple; bh=It04Ff28MPxtGvF0HXZwYBt4Qj3dD0PWE+ocyzIoqi8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=AZIfvUbSWvItxBCGyHtkcaOijvsn7jE5G0HdPIx7PKmOghq+9uh0ihiaza8odcYYhTfa9iuZznNNE7BAE6tXL7xEZHJB0tyCI9if9h0z8wo3h4f3qc7wSU2a0MT6rQ1CVX6U8IDGb9Pm/nf6ppSjMSAGntgvRjVdWlEDiEC+J4Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D281A1650; Tue, 9 Jul 2024 06:09:14 -0700 (PDT) Received: from [10.44.160.75] (e126510-lin.lund.arm.com [10.44.160.75]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6E8F63F766; Tue, 9 Jul 2024 06:08:43 -0700 (PDT) Message-ID: <87b5070e-c85c-4585-b223-e48e5556cbac@arm.com> Date: Tue, 9 Jul 2024 15:08:40 +0200 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 22/29] arm64: add Permission Overlay Extension Kconfig To: Joey Gouly , linux-arm-kernel@lists.infradead.org Cc: akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, szabolcs.nagy@arm.com, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-23-joey.gouly@arm.com> Content-Language: en-GB From: Kevin Brodsky In-Reply-To: <20240503130147.1154804-23-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 03/05/2024 15:01, Joey Gouly wrote: > Now that support for POE and Protection Keys has been implemented, add a > config to allow users to actually enable it. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > --- > arch/arm64/Kconfig | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 7b11c98b3e84..676ebe4bf9eb 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2095,6 +2095,28 @@ config ARM64_EPAN > if the cpu does not implement the feature. > endmenu # "ARMv8.7 architectural features" > > +menu "ARMv8.9 architectural features" Nit: empty line here to be consistent with other menu entries. Kevin > +config ARM64_POE > + prompt "Permission Overlay Extension" > + def_bool y > + select ARCH_USES_HIGH_VMA_FLAGS > + select ARCH_HAS_PKEYS > + help > + The Permission Overlay Extension is used to implement Memory > + Protection Keys. Memory Protection Keys provides a mechanism for > + enforcing page-based protections, but without requiring modification > + of the page tables when an application changes protection domains. > + > + For details, see Documentation/core-api/protection-keys.rst > + > + If unsure, say y. > + > +config ARCH_PKEY_BITS > + int > + default 3 > + > +endmenu # "ARMv8.9 architectural features" > + > config ARM64_SVE > bool "ARM Scalable Vector Extension support" > default y