From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EFA9EC3DA50 for ; Mon, 15 Jul 2024 07:48:42 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WMvTP4wRMz3dSM for ; Mon, 15 Jul 2024 17:48:41 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arm.com (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=anshuman.khandual@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4WMvSx3yxqz30V1 for ; Mon, 15 Jul 2024 17:48:14 +1000 (AEST) 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 806EADA7; Mon, 15 Jul 2024 00:48:07 -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 E88C73F762; Mon, 15 Jul 2024 00:47:33 -0700 (PDT) Message-ID: <763279ea-7885-444c-9ca0-7a2cf7c7016d@arm.com> Date: Mon, 15 Jul 2024 13:17:30 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Anshuman Khandual Subject: Re: [PATCH v4 04/29] arm64: disable trapping of POR_EL0 to EL2 To: Joey Gouly , linux-arm-kernel@lists.infradead.org References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-5-joey.gouly@arm.com> Content-Language: en-US In-Reply-To: <20240503130147.1154804-5-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: szabolcs.nagy@arm.com, catalin.marinas@arm.com, dave.hansen@linux.intel.com, linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, mingo@redhat.com, naveen.n.rao@linux.ibm.com, will@kernel.org, npiggin@gmail.com, broonie@kernel.org, bp@alien8.de, kvmarm@lists.linux.dev, tglx@linutronix.de, oliver.upton@linux.dev, aneesh.kumar@linux.ibm.com, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 5/3/24 18:31, Joey Gouly wrote: > Allow EL0 or EL1 to access POR_EL0 without being trapped to EL2. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > Acked-by: Catalin Marinas > --- > arch/arm64/include/asm/el2_setup.h | 10 +++++++++- > 1 file changed, 9 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h > index b7afaa026842..df5614be4b70 100644 > --- a/arch/arm64/include/asm/el2_setup.h > +++ b/arch/arm64/include/asm/el2_setup.h > @@ -184,12 +184,20 @@ > .Lset_pie_fgt_\@: > mrs_s x1, SYS_ID_AA64MMFR3_EL1 > ubfx x1, x1, #ID_AA64MMFR3_EL1_S1PIE_SHIFT, #4 > - cbz x1, .Lset_fgt_\@ > + cbz x1, .Lset_poe_fgt_\@ > > /* Disable trapping of PIR_EL1 / PIRE0_EL1 */ > orr x0, x0, #HFGxTR_EL2_nPIR_EL1 > orr x0, x0, #HFGxTR_EL2_nPIRE0_EL1 > > +.Lset_poe_fgt_\@: > + mrs_s x1, SYS_ID_AA64MMFR3_EL1 > + ubfx x1, x1, #ID_AA64MMFR3_EL1_S1POE_SHIFT, #4 > + cbz x1, .Lset_fgt_\@ > + > + /* Disable trapping of POR_EL0 */ > + orr x0, x0, #HFGxTR_EL2_nPOR_EL0 > + > .Lset_fgt_\@: > msr_s SYS_HFGRTR_EL2, x0 > msr_s SYS_HFGWTR_EL2, x0 Reviewed-by: Anshuman Khandual