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 9C60917C219; Thu, 28 Nov 2024 15:52:46 +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=1732809166; cv=none; b=ukb5XHP6YuxZQwjML+M/+f1+ncYXcjLIMeSXDG9QV7XKwGAMh7+nAhvSfB1/OMye8F27hXoLuF00Eeeakx7GcDJuOKDJd9cqhNw4mN9XSEPbgJrnNQQIDnWEwN7SjfEHtVZFHyU6nzJyxgi06RMAidCzpUMFUwI1B6ihbH186y8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732809166; c=relaxed/simple; bh=rdG79C/elJq0vGPG1kQF7+OR6KALzUkhER+aDpZe3sA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=q76DliMqTMTcHbgx53lnZrjjneVxqbEeaoTG6zh7NoZUkd9C8hYaZ7XhKoXGWcRUh1cTpw1mImmvzwxV+yBsRRr5lObE7kdS3Q7z1zxiI4InNwLqpOl932NpOb43cMTL59Wlg7ByX+G5fPvL1z9GZTnrioIZeZBkKpiimMsQCB0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aIQSrSzY; 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="aIQSrSzY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C63EFC4CECE; Thu, 28 Nov 2024 15:52:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732809166; bh=rdG79C/elJq0vGPG1kQF7+OR6KALzUkhER+aDpZe3sA=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=aIQSrSzYQK4zDeCwjpIUHuexk6x4zvEQdZo/aGpNATfEyfud358U8v17NDUUIsZAB tudq82l8hJHu+1U2diqhrNJXiOJ4KiYmHF0d1p6/OKYBpG7uYT/hcjWLzkq/XT7oOI qZ1AucNcyvZUT8ZJSxEdXaS79FN58Moe/1Vk9iO/ZbkThCmKGdFky9QxvenIn+Xu0j xMdpcFotwHvJenLi3rYVXPDTAgNy3WKn1s6BSdbQDgkFbgtJNSBu27CkU/8V4Rtd/p QdI+HISDUoLQmZ1PXljV0Vl4zTzqLXHXOUTF4yGduxo215je04jyH8PgfRZxKzyTpb DmBVtcANoTTkg== Date: Thu, 28 Nov 2024 10:52:44 -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> 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: <20241128115924.GAZ0hbHKsbtCixVqAe@fat_crate.local> On Thu, Nov 28, 2024 at 12:59:24PM +0100, Borislav Petkov wrote: >Hey folks, > >On Mon, Jan 15, 2024 at 06:26:56PM -0500, Sasha Levin wrote: >> From: "Borislav Petkov (AMD)" >> >> [ Upstream commit 04c3024560d3a14acd18d0a51a1d0a89d29b7eb5 ] >> >> AMD does not have the requirement for a synchronization barrier when >> acccessing a certain group of MSRs. Do not incur that unnecessary >> penalty there. > >Erwan just mentioned that this one is not in 6.1 and in 5.15. And I have mails >about it getting picked up by AUTOSEL. > >Did the AI reconsider in the meantime? You've missed the 5.10 mail :) Pavel objected to it so I've dropped it: https://lore.kernel.org/all/Zbli7QIGVFT8EtO4@sashalap/ -- Thanks, Sasha