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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1721655605; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H2lOtJd5Tq00aUAMRJSCfkN2IjEcFlnp/3fvLapxE18=; b=iNiGIyTwGuDGSUrJncuP4DPrdFJk/hDu4IwBdzriLq4xHR/DeA2sw8KpHuXI0twyFrtMDN WuqzLB1Yx8Y27Amp2ZU6gwtBzZBK/Ld1xce+NGKFKPKOBdQvABJl33OwiYSLELEUvncnHS AJ7oPbZcXkcdCwwBGLDuPls3dqhnKmo= 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-Rspamd-Queue-Id: 94E80C001F X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: xr7ytmdyqqy9n35pqu7m1chxbi7xtt97 X-HE-Tag: 1721655639-659288 X-HE-Meta: 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 rit+aVyE Tjw7xQnf/sXJ1+AifH2CT8EiK1Ogh50gBnPE3npP47Qh+3hLYympz3arg1Ny6VD8d/KufTpTjgQPRVnUMDhOizH///ql6yO6ugE2IyOHpSNLOINgOfjsHCtChlrEj7qRwGoOn5AB2rpP500TwwXMITkRgKb45EPj8wuAijNMuI3mENudZVPMi09mK5B2E06KQ7dqA 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 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;