From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 921061BC58; Fri, 29 Nov 2024 00:21:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732839712; cv=none; b=fe3RGqOW7GkqEtNuUu2ygj4jDWb/KLETV3IwEOStTXxBDqQ82POjcvIZoICvsZL6cvAioZ6TRoZLbpSdQldmlW+NSIU/1sWvJ/VYch3TWfTObpQYXa0z44wDzNpJr2323emkvchIICfRjm8gRP96snRD/vCUfBh8tEv4puvLyU4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732839712; c=relaxed/simple; bh=nvFcu3/cFL/dBKUFcpgtwC3OqBP9XL4Kc3WBq1zpla8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=fyEXVpwBqm0bY6PA7yGu2MPO12K2lPPNHG6hEf7tHnf20h12kXEW2XGx19tlOr+tXkoB6e9wxQ+M5KJn9q6clt81jz2vHglbZZogsZA0zT3BCOQD1fVrWWinHYO/GRVSgr64HQeKk5u4soRuBdhRQzjAlqafmQRAacW1mOuQb64= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aDb2WJ1h; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aDb2WJ1h" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0D96C4CECE; Fri, 29 Nov 2024 00:21:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732839712; bh=nvFcu3/cFL/dBKUFcpgtwC3OqBP9XL4Kc3WBq1zpla8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=aDb2WJ1hivrEH+tqUwaOnh7UXgdFiUVQK8jg6VRe31fa6dAChFHIxmIjqwjaO+XjM RtS2GFcxFABI9adm9/jTmlalIqgM/ZpWfrTT8lYEs8/omV703B5bvJdZ7NMPBsOPaL 1lRundx0mVbz7S2XThsnHtF2uWZtZnpDd2OWOZVg3aoiMTt4APwRwEPNvtg0BExmEI HXCZfT79r6wByhKp1hUWeoEzRf3LRxbGQ1wmTw4wnTN7BV93/TI9v/sCa/sSmRAjJE sVlNCcAwUxxhLccPGJouOgSvY54PBjJ2tdf1VL4Q1pbiEW7WxxeSP2hB4JwGy6VQ/q UFapDSIX5XQdg== Date: Thu, 28 Nov 2024 19:21:50 -0500 From: Sasha Levin To: Borislav Petkov Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org, puwen@hygon.cn, seanjc@google.com, kim.phillips@amd.com, jmattson@google.com, babu.moger@amd.com, peterz@infradead.org, rick.p.edgecombe@intel.com, brgerst@gmail.com, ashok.raj@intel.com, mjguzik@gmail.com, jpoimboe@kernel.org, nik.borisov@suse.com, aik@amd.com, vegard.nossum@oracle.com, daniel.sneddon@linux.intel.com, acdunlap@google.com, Erwan Velu , pavel@denx.de Subject: Re: [PATCH AUTOSEL 5.15 11/12] x86/barrier: Do not serialize MSR accesses on AMD Message-ID: References: <20240115232718.209642-1-sashal@kernel.org> <20240115232718.209642-11-sashal@kernel.org> <20241128115924.GAZ0hbHKsbtCixVqAe@fat_crate.local> <20241128164310.GCZ0idnhjpAV6wFWm6@fat_crate.local> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20241128164310.GCZ0idnhjpAV6wFWm6@fat_crate.local> On Thu, Nov 28, 2024 at 05:43:10PM +0100, Borislav Petkov wrote: >On Thu, Nov 28, 2024 at 10:52:44AM -0500, Sasha Levin wrote: >> You've missed the 5.10 mail :) > >You mean in the flood? ;-P Suggestions welcome... I don't really insist on a massive flood and was mostly following what was the convention when I started doing this work. I thought about cutting it down to one mail per commit, but OTOH I had folks complain often enough that they missed a mail or that it wasn't obvious enough. >> Pavel objected to it so I've dropped it: https://lore.kernel.org/all/Zbli7QIGVFT8EtO4@sashalap/ > >So we're not backporting those anymore? But everything else? :-P It was dropped from everywhere. The reason it ended up in 6.6 was because your AMD friends requested it: https://lore.kernel.org/all/2024022146-chunk-fencing-1e8f@gregkh/ >And 5.15 has it already... It might be all those thanksgiving drinks, but I can't find it in 5.15... I see it was part of 6.7.6 and 6.6.18, but nothing older. >Frankly, with the amount of stuff going into stable, I see no problem with >backporting such patches. Especially if the people using stable kernels will >end up backporting it themselves and thus multiply work. I.e., Erwan's case. The stable kernel rules allow for "notable" performance fixes, and we already added it to 6.6. No objection to adding it to older kernels... Happy to do it after the current round of releases goes out. -- Thanks, Sasha