From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 864CD1A8BEF; Wed, 31 Jul 2024 11:40:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722426021; cv=none; b=AjJK32vnEIRJV5VlYR6/mfPH7KOhT/IAel2Jnx90auvSMty7qEUf7kMa1XCTxdqZG6RjmlqiWSw/RMkpVQLSkD2Q/DWpQr/CS/bY7IAP6ebETJ7eQ4AEbzk4S3yT6Bpk09xudRpP5EZZoN22AFErVk6HSMMX8iMHiFZZyiNi6Xo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722426021; c=relaxed/simple; bh=VB8zuIkGeiks0g6qaKKdnBCfHjxgfC4ibEqG9JE2fpA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=bJ21bmbCytBgKFlHQr0LogfTg+QBG39kdyb+Hrbi7/NFR7M3masaPNB+NlcMcGoM9QIOtAS0prNFSJptHehdhHQK/yWE3lr3sXeeGNoFX/mjqqtHN8VveIOS31bJ+wG8XBT3dNXBUtJ8z0jfRtlmLF8xGDMANan3I8mL3pMgMs8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=rdfXlEsA; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="rdfXlEsA" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=2iiBapHi5E4yCyY0JG3xWUh4YuuU45iPPgouplI2hYc=; b=rdfXlEsAuUDE+tc0RwDhVPiUPT yQRkMAOiOUZONJLi8qJLFJFzzS+XyZLEabzmTKR/DJiOskzEO93Hw05cX8UZuC/DfFE7uFCL2w0CV 66NNG1mfMq0TkwZcGYDYhVgAVkMn00eXOpr1pAd5kNxl8yJeQencJOVV0gs9qIvocFIKJvF+ZMPCG qt6TDhO4IFp7mnqTdIemPm47zi36pEv8KQeY0uzRXF9I1fVAPx5GoEZ7vH4G34YfXABkTJQiYqliI rIOZXWecIqN/EAkib4htRzYlrEBFTYI8J5x5vAEtxxrcD5aTVPaycmeOyoOooWk9MURYmwhxxqCuN ShYi6ymg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZ7gX-0000000G3oZ-1riD; Wed, 31 Jul 2024 11:40:01 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id A9120300820; Wed, 31 Jul 2024 13:40:00 +0200 (CEST) Date: Wed, 31 Jul 2024 13:40:00 +0200 From: Peter Zijlstra To: "Kirill A. Shutemov" Cc: Thomas Gleixner , Shivank Garg , ardb@kernel.org, bp@alien8.de, brijesh.singh@amd.com, corbet@lwn.net, dave.hansen@linux.intel.com, hpa@zytor.com, jan.kiszka@siemens.com, jgross@suse.com, kbingham@kernel.org, linux-doc@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, luto@kernel.org, michael.roth@amd.com, mingo@redhat.com, rick.p.edgecombe@intel.com, sandipan.das@amd.com, thomas.lendacky@amd.com, x86@kernel.org Subject: Re: [PATCH 0/3] x86: Make 5-level paging support unconditional for x86-64 Message-ID: <20240731114000.GC33588@noisy.programming.kicks-ass.net> References: <80734605-1926-4ac7-9c63-006fe3ea6b6a@amd.com> <87wml16hye.ffs@tglx> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Wed, Jul 31, 2024 at 02:36:47PM +0300, Kirill A. Shutemov wrote: > The risk with your proposal is that 5-level paging will not get any > testing and rot over time. > > I would like to keep it on, if possible. Well, if it is boot time, you just tell your CI to force enable 5level and you're done, right? Then the rest of us use 4 and we all good.