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imf19.hostedemail.com; dkim=none; spf=pass (imf19.hostedemail.com: domain of anshuman.khandual@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=anshuman.khandual@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1721035557; a=rsa-sha256; cv=none; b=2yXcnvRGK3LnN1Lp336R1uPao4VuipTWmbnHv8wTst4SZ5FLb6wJOmjuTMMEvVUdZvv5wG uPGbuWfb7TgKgA5At2sYa8MWxzQth0BEoWBgNcw41hxC+Dh2JY0ZmxO58NM4y8ahDTUsgv fu++lqvZUGRtnLVMZuV5KUMQSQ5pU5k= 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 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 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 5B91C1A001A X-Stat-Signature: fhchri5g8je3mckfp4kdoo46giux8xsa X-HE-Tag: 1721035575-817581 X-HE-Meta: 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 mB8RYrJd FFbPjjcf/EKbMiBkcAOqAVqUumQD3lDtw3dz7FeuF0Brk2g5VYOBd+UCv625DiaRh+6BaHeVcip8nqYWaZ6RRflscA3wr7fx7DJ5hDJWMHPwRI5kmPe1QQ8tKYO1T0GWYv+FdZPpidZxs4NS90+zTX6+Iwbdk18UcgilX5+25OTNDnQvGwycB8Gce2TTWkKSNE9XhUrKhY9d/ru2/xZbbLpPc/K+qHGRD+CE5OzhP+Oqglq5oWbFjVwUcXe9uASXD2v6bEqecn/ecVTQ= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.