From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 77DBA364D7; Fri, 15 Dec 2023 15:15:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="ZJmitctl" Received: from [192.168.4.26] (unknown [47.186.13.91]) by linux.microsoft.com (Postfix) with ESMTPSA id 31E8020B3CC2; Fri, 15 Dec 2023 07:15:53 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 31E8020B3CC2 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1702653353; bh=TbbdfdN9F0xN9xrOOIN9kgjBMXwWRzLs8wobMZJ5G9w=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ZJmitctlicMc0n358JdynVujyRx8KAn3uE9xYYk/edA5anFQwi7Mk1mnplEaW6Dxo GyZNdp1Pqtq0FL20GrsS1CHIorRxueJdfaS7cPSyvY3nCdzlmkvZ4AKi74xlxMjrOP DndtXFw70MDLSdjfvoYF6c8lpW2s5GVkz7yPjv58= Message-ID: <8f3d6362-1513-45a9-9f56-f7ec4bff11a2@linux.microsoft.com> Date: Fri, 15 Dec 2023 09:15:52 -0600 Precedence: bulk X-Mailing-List: live-patching@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: ARM64 Livepatch based on SFrame To: Mark Rutland Cc: jpoimboe@redhat.com, peterz@infradead.org, chenzhongjin@huawei.com, broonie@kernel.org, nobuta.keiya@fujitsu.com, sjitindarsingh@gmail.com, catalin.marinas@arm.com, will@kernel.org, jamorris@linux.microsoft.com, linux-arm-kernel@lists.infradead.org, live-patching@vger.kernel.org, linux-kernel@vger.kernel.org References: <0337266cf19f4c98388e3f6d09f590d9de258dc7> <20230202074036.507249-1-madvenka@linux.microsoft.com> <72364198-b031-4ecc-b337-d07db1b9d0c8@linux.microsoft.com> Content-Language: en-US From: "Madhavan T. Venkataraman" In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/15/23 07:04, Mark Rutland wrote: > On Thu, Dec 14, 2023 at 02:49:29PM -0600, Madhavan T. Venkataraman wrote: >> Hi Mark, > > Hi Madhavan, > >> I attended your presentation in the LPC. You mentioned that you could use >> some help with some pre-requisites for the Livepatch feature. >> I would like to lend a hand. > > Cool! > > I've been meaning to send a mail round with a summary of the current state of > things, and what needs to be done going forward, but I haven't had the time > since LPC to put that together (as e.g. that requires learning some more about > SFrame). I'll be disappearing for the holiday shortly, and I intend to pick > that up in the new year. > >> What would you like me to implement? > > I'm not currently sure exactly what we need/want to implement, and as above I > think that needs to wait until the new year. > OK. > However, one thing that you can do that would be very useful is to write up and > report the GCC DWARF issues that you mentioned in: > > https://lore.kernel.org/linux-arm-kernel/20230202074036.507249-1-madvenka@linux.microsoft.com/ > > ... as (depending on exactly what those are) those could also affect SFrame > generation (and thus we'll need to get those fixed in GCC), and regardless it > would be useful information to know. > > I understood that you planned to do that from: > > https://lore.kernel.org/linux-arm-kernel/054ce0d6-70f0-b834-d4e5-1049c8df7492@linux.microsoft.com/ > > ... but I couldn't spot any relevant mails or issues in the GCC bugzilla, so > either I'm failing to search hard enough, or did that get forgotten about? > Yeah. I had notes on that. But I seem to have lost them. I need to reproduce the problems and analyze them again which is not trivial. So, I have been procrastinating. I am also disappearing for the rest of this year. I will try to look at it in the new year. >> I would also like to implement Unwind Hints for the feature. If you want a >> specific format for the hints, let me know. > > I will get back to you on that in the new year; I think the specifics we want > are going to depend on other details above we need to analyse first. > OK. For now, I will implement something and send it out just for reference. We can revisit this topic next year sometime. Thanks. Madhavan