From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f71.google.com (mail-pl0-f71.google.com [209.85.160.71]) by kanga.kvack.org (Postfix) with ESMTP id A165E6B0003 for ; Sun, 11 Feb 2018 17:12:45 -0500 (EST) Received: by mail-pl0-f71.google.com with SMTP id f64so2971601plb.7 for ; Sun, 11 Feb 2018 14:12:45 -0800 (PST) Received: from bedivere.hansenpartnership.com (bedivere.hansenpartnership.com. [66.63.167.143]) by mx.google.com with ESMTPS id r3-v6si4950964plo.432.2018.02.11.14.12.44 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sun, 11 Feb 2018 14:12:44 -0800 (PST) Message-ID: <1518387160.3979.10.camel@HansenPartnership.com> Subject: Re: [PATCH 00/31 v2] PTI support for x86_32 From: James Bottomley Date: Sun, 11 Feb 2018 14:12:40 -0800 In-Reply-To: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> References: <1518168340-9392-1-git-send-email-joro@8bytes.org> <20180209191112.55zyjf4njum75brd@suse.de> <20180210091543.ynypx4y3koz44g7y@angband.pl> <20180211105909.53bv5q363u7jgrsc@angband.pl> <6FB16384-7597-474E-91A1-1AF09201CEAC@gmail.com> <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Andy Lutomirski , Mark D Rustad Cc: Adam Borowski , Linus Torvalds , Joerg Roedel , Andy Lutomirski , Joerg Roedel , Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , X86 ML , LKML , Linux-MM , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , "Liguori, Anthony" , Daniel Gruss , Hugh Dickins , Kees Cook , Andrea Arcangeli , Waiman Long , Pavel Machek On Sun, 2018-02-11 at 11:42 -0800, Andy Lutomirski wrote: > > On Feb 11, 2018, at 9:40 AM, Mark D Rustad wrote: > > > > > > > > > On Feb 11, 2018, at 2:59 AM, Adam Borowski > > > wrote: > > > > > > > > > > > Does Debian make it easy to upgrade to a 64-bit kernel if you > > > > have a > > > > 32-bit install? > > > > > > Quite easy, yeah.A A Crossgrading userspace is not for the faint of > > > the heart, > > > but changing just the kernel is fine. > > > > ISTR that iscsi doesn't work when running a 64-bit kernel with a > > 32-bit userspace. I remember someone offered kernel patches to fix > > it, but I think they were rejected. I haven't messed with that > > stuff in many years, so perhaps the userspace side now has > > accommodation for it. It might be something to check on. > > > > At the risk of suggesting heresy, should we consider removing x86_32 > support at some point? Hey, my cloud server is 32 bit: bedivere:~# cat /proc/cpuinfoA processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 9 microcode : 0x2e cpu MHz : 2813.464 [...] I suspect a lot of people are in the same position: grandfathered in on an old hosting plan, but not really willing to switch to a new 64 bit box because the monthly cost about doubles and nothing it does is currently anywhere up to (let alone over) the capacity of the single 686 processor. The thing which is making me consider it is actually getting a TPM to protect the private keys, but doubling the monthly cost is still a huge disincentive. James -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org