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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 0BAA3C3DA59 for ; Mon, 22 Jul 2024 13:41:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=H2lOtJd5Tq00aUAMRJSCfkN2IjEcFlnp/3fvLapxE18=; b=a5pn3XZ9gRxnOIr8kI8HBkCBpd /OM4pafjIXodEP5w5ZwP0z+wu8f1Nlph6ycobznbr4d/42BT/rmQpZbjx6Owrg8QidP8EnzRt0xZ3 XgnnBUUgxXwJTp7vhCHIHdQGwnZHjYBsJ+qyoRS2Fo6gYh2cs7GAe9+NW9yqvZ4oOAMkGeMq9RqoU eG9Lf3NdDa0eVrUO+xqP6sElRr/7Gne7BbF/dmBP8c18NNZ1G4n2SLCP77opPdiRY6ZeKCZuaNF/6 dfgZd+g5exSiIcSxsUmA+/33ErB4RUpl9i/912RKGKOBhVgyYUnJzOn9QxH3ZAkp8QNxSaHPFpBkO NQebKGMg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVtHj-00000009g0b-0q3y; Mon, 22 Jul 2024 13:41:03 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sVtHM-00000009fu2-0D9c for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2024 13:40:41 +0000 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 40DD31007; Mon, 22 Jul 2024 06:41:04 -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 E32943F766; Mon, 22 Jul 2024 06:40:33 -0700 (PDT) Message-ID: <57220128-e8b0-4b78-b0f9-8c8dc195f1fb@arm.com> Date: Mon, 22 Jul 2024 15:40:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 06/29] arm64: context switch POR_EL0 register 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> <20240503130147.1154804-7-joey.gouly@arm.com> Content-Language: en-GB From: Kevin Brodsky In-Reply-To: <20240503130147.1154804-7-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240722_064040_173134_A7F2A94E X-CRM114-Status: UNSURE ( 6.80 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/05/2024 15:01, Joey Gouly wrote: > @@ -371,6 +382,9 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) > if (system_supports_tpidr2()) > p->thread.tpidr2_el0 = read_sysreg_s(SYS_TPIDR2_EL0); > > + if (system_supports_poe()) > + p->thread.por_el0 = read_sysreg_s(SYS_POR_EL0); This is most likely needed for kernel threads as well, because they may be affected by POR_EL0 too (see my reply on patch 17). Kevin > + > if (stack_start) { > if (is_compat_thread(task_thread_info(p))) > childregs->compat_sp = stack_start;