From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 23 Oct 2018 11:11:27 +0200 From: Pavel Machek Subject: Not-so-old machines without PAE was Re: 32-bit PTI with THP = userspace corruption Message-ID: <20181023091127.GA9843@amd> References: <20180831070722.wnulbbmillxkw7ke@suse.de> <20180911114927.gikd3uf3otxn2ekq@suse.de> <20180911121128.ikwptix6e4slvpt2@suse.de> <20180918140030.248afa21@alans-desktop> <20181021123745.GA26042@amd> <20181022075642.icowfdg3y5wcam63@suse.de> <20181022194817.148796e6@alans-desktop> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="PEIAKu/WMn1b1Hv9" Content-Disposition: inline In-Reply-To: <20181022194817.148796e6@alans-desktop> Sender: linux-kernel-owner@vger.kernel.org To: Alan Cox Cc: Joerg Roedel , Meelis Roos , Thomas Gleixner , Linux Kernel list , linux-mm@kvack.org, Andrea Arcangeli , Linus Torvalds List-ID: --PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon 2018-10-22 19:48:17, Alan Cox wrote: > On Mon, 22 Oct 2018 09:56:42 +0200 > Joerg Roedel wrote: >=20 > > On Sun, Oct 21, 2018 at 02:37:45PM +0200, Pavel Machek wrote: > > > On Tue 2018-09-18 14:00:30, Alan Cox wrote: =20 > > > > There are pretty much no machines that don't support PAE and are st= ill > > > > even vaguely able to boot a modern Linux kernel. The oddity is the > > > > Pentium-M but most distros shipped a hack to use PAE on the Pentium= M > > > > anyway as it seems to work fine. =20 > > >=20 > > > I do have some AMD Geode here, in form of subnotebook. Definitely > > > newer then Pentium Ms, but no PAE... =20 > >=20 > > Are the AMD Geode chips affected by Meltdown? >=20 > Geode for AMD was just a marketing name. >=20 > The AMD athlon labelled as 'Geode' will behave like any other Athlon but > I've not seen anyone successfully implement Meltdown on the Athlon so it's > probably ok.=20 >=20 > The earlier NatSemi ones are not AFAIK vulnerable to either. The later > ones might do Spectre (they have branch prediction which is disabled on > the earlier ones) but quite possibly not enough to be attacked usefully - > and you can turn it off anyway if you care. >=20 > And I doubt your subnotebook can usefully run modern Linux since the > memory limit on most Geode was about 64MB. Well, let me see. The machine is not too useful because of dead battery, but I don't believe RAM would be a problem. It has 512MB or more, IIRC. Missing PAE is, and missing instructions are. And horrible keyboard and bad driver support from Linux. And... Ouch and fact that I use its power supply to power something else. It looks similar to this: https://hexus.net/tech/news/laptop/13994-kohjinsha-launches-impressive-subn= otebook-twist/ (but has no touchscreen). Bios is "built 03/02/2007". CPU is "AuthenticAMD" family 5 model 10, "Geode(TM) Integrated Processor by AMD PCS". 500 MHz, flags "fpu de pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow". 512MB RAM. This is not a suitable compile server, but still could work as a subnotebook given right software... Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --PEIAKu/WMn1b1Hv9 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlvO5b8ACgkQMOfwapXb+vIqlwCgruwFLlA3MLQtzHmSt4hS12oG MlMAoL5wASCKq9SjjCtBjlpVoz1vx2S4 =o3Dr -----END PGP SIGNATURE----- --PEIAKu/WMn1b1Hv9--