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 6259C186E26 for ; Mon, 15 Jul 2024 09:26:15 +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=1721035576; cv=none; b=rCQHTMWVBkYrtxoixlIHiVhw7Xed4tBMe4lWYvoC9AINqtZAke5lQv0sOnPzk53HwuGOugGBFnP4udhrcQ5EKvQf8uE/Z/Mt4VipTcdj1VEa/YL7tZiHHTr7yaAbq/1qI6A7yDPxy9SLEPFTArEnVgR5WbRhBDWU8pnU77LBE2w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721035576; c=relaxed/simple; bh=KucS5ULM43WZGpU96NOaXujaM57c3Fj/TphE+Wk6KC4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=dIA/w1GSaszbyq/dTjCPKyv/s2spFXNOp6cytwhNe3jhenwkoR7wghKEcsJfSFLQ5RtDq4fFmLPsIJRsjiOUtXqRNPpEjLE2qm4R6Ft7ZZjxitsc/yl4gSvOf/DY6+euk0/n3x9ewHWHjYtCnuUqSJ6s+29lOwU/S3eMB51Zfpk= 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 ED58ADA7; Mon, 15 Jul 2024 02:26:39 -0700 (PDT) Received: from [10.162.40.16] (a077893.blr.arm.com [10.162.40.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7B89E3F73F; Mon, 15 Jul 2024 02:26:06 -0700 (PDT) Message-ID: <1da79356-4cf7-476f-bd16-61123e39598a@arm.com> Date: Mon, 15 Jul 2024 14:56:03 +0530 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 12/29] arm64: add POIndex defines 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> <20240503130147.1154804-13-joey.gouly@arm.com> Content-Language: en-US From: Anshuman Khandual In-Reply-To: <20240503130147.1154804-13-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/3/24 18:31, Joey Gouly wrote: > The 3-bit POIndex is stored in the PTE at bits 60..62. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > --- > arch/arm64/include/asm/pgtable-hwdef.h | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h > index ef207a0d4f0d..370a02922fe1 100644 > --- a/arch/arm64/include/asm/pgtable-hwdef.h > +++ b/arch/arm64/include/asm/pgtable-hwdef.h > @@ -198,6 +198,16 @@ > #define PTE_PI_IDX_2 53 /* PXN */ > #define PTE_PI_IDX_3 54 /* UXN */ > > +/* > + * POIndex[2:0] encoding (Permission Overlay Extension) > + */ > +#define PTE_PO_IDX_0 (_AT(pteval_t, 1) << 60) > +#define PTE_PO_IDX_1 (_AT(pteval_t, 1) << 61) > +#define PTE_PO_IDX_2 (_AT(pteval_t, 1) << 62) > + > +#define PTE_PO_IDX_MASK GENMASK_ULL(62, 60) > + > + > /* > * Memory Attribute override for Stage-2 (MemAttr[3:0]) > */ Could this patch be folded with a later patch that uses the above indices and the mask for the first time.