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Venkataraman" Message-ID: <8268fde8-5f3b-0781-971b-b29b5e0916cf@linux.microsoft.com> Date: Thu, 6 May 2021 10:30:21 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210506141211.GE4642@sirena.org.uk> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210506_083024_290310_34EE630C X-CRM114-Status: GOOD ( 31.35 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 5/6/21 9:12 AM, Mark Brown wrote: > On Mon, May 03, 2021 at 12:36:14PM -0500, madvenka@linux.microsoft.com wrote: > >> There are some SYM_CODE functions that are currently in ".text" or >> ".init.text" sections. Some of these are functions that the unwinder >> does not care about as they are not "interesting" to livepatch. These >> will remain in their current sections. The rest I have moved into a >> new section called ".code.text". > > I was thinking it'd be good to do this by modifying SYM_CODE_START() to > emit the section, that way nobody can forget to put any SYM_CODE into a > special section. That does mean we'd have to first introduce a new > variant for specifying a section that lets us override things that need > to be in some specific section and convert everything that's in a > special section over to that first which is a bit annoying but feels > like it's worth it for the robustness. It'd also put some of the don't > cares into .code.text but so long as they are actually don't cares that > should be fine! > OK. I could make the section an argument to SYM_CODE*() so that a developer will never miss that. Some documentation may be in order so the guidelines are clear. I will do the doc patch separately, if that is alright with you all. About the don't car functions - most of them are OK to be moved into .code.text. But the hypervisor vector related code has a problem. I have not debugged that yet. If I add that code in .code.text, KVM initialization fails in one case. In another case, when I actually test with a VM, the VM does not come up. I am not sure. But it looks like there may be some reloc issue going on. I don't have a handle on this yet. So, for now, I will leave the hypervisor stuff in .text. But I will mark it as TBD in the cover letter so we don't lose track of it. >> Don't care functions >> ==================== > > We also have a bunch of things like __cpu_soft_restart which don't seem > to be called out here but need to be in .idmap.text. > It is already in .idmap.text. /* SPDX-License-Identifier: GPL-2.0-only */ /* * CPU reset routines * * Copyright (C) 2001 Deep Blue Solutions Ltd. * Copyright (C) 2012 ARM Ltd. * Copyright (C) 2015 Huawei Futurewei Technologies. */ #include #include #include #include .text .pushsection .idmap.text, "awx" /* * __cpu_soft_restart(el2_switch, entry, arg0, arg1, arg2) - Helper for * cpu_soft_restart. * * @el2_switch: Flag to indicate a switch to EL2 is needed. * @entry: Location to jump to for soft reset. * arg0: First argument passed to @entry. (relocation list) * arg1: Second argument passed to @entry.(physical kernel entry) * arg2: Third argument passed to @entry. (physical dtb address) * * Put the CPU into the same state as it would be if it had been reset, and * branch to what would be the reset vector. It must be executed with the * flat identity mapping. */ SYM_CODE_START(__cpu_soft_restart) mov_q x12, INIT_SCTLR_EL1_MMU_OFF pre_disable_mmu_workaround /* * either disable EL1&0 translation regime or disable EL2&0 translation * regime if HCR_EL2.E2H == 1 */ msr sctlr_el1, x12 isb cbz x0, 1f // el2_switch? mov x0, #HVC_SOFT_RESTART hvc #0 // no return 1: mov x8, x1 // entry mov x0, x2 // arg0 mov x1, x3 // arg1 mov x2, x4 // arg2 br x8 SYM_CODE_END(__cpu_soft_restart) .popsection I will double check all the *.S files and make sure that every function is accounted for in version 4. Stay tuned. Thanks. Madhavan _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel