From: Pavel Machek <pavel@ucw.cz>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Mark D Rustad <mrustad@gmail.com>,
Adam Borowski <kilobyte@angband.pl>,
Linus Torvalds <torvalds@linux-foundation.org>,
Joerg Roedel <jroedel@suse.de>, Andy Lutomirski <luto@kernel.org>,
Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, "H . Peter Anvin" <hpa@zytor.com>,
X86 ML <x86@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
Dave Hansen <dave.hansen@intel.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Juergen Gross <jgross@suse.com>,
Peter Zijlstra <peterz@infradead.org>,
Borislav Petkov <bp@alien8.de>, Jiri Kosina <jkosina@suse.cz>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Brian Gerst <brgerst@gmail.com>,
David Laight <David.Laight@aculab.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Eduardo Valentin <eduval@amazon.com>,
Greg KH <gregkh@linuxfoundation.org>,
Will Deacon <will.deacon@arm.com>,
"Liguori, Anthony" <aliguori@amazon.com>,
Daniel Gruss <daniel.gruss@iaik.tugraz.at>,
Hugh Dickins <hughd@google.com>, Kees Cook <keescook@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Waiman Long <llong@redhat.com>
Subject: Re: [PATCH 00/31 v2] PTI support for x86_32
Date: Sun, 11 Feb 2018 23:34:18 +0100 [thread overview]
Message-ID: <20180211223416.GA3762@localhost> (raw)
In-Reply-To: <0C6EFF56-F135-480C-867C-B117F114A99F@amacapital.net>
On Sun 2018-02-11 11:42:47, Andy Lutomirski wrote:
>
>
> On Feb 11, 2018, at 9:40 AM, Mark D Rustad <mrustad@gmail.com> wrote:
>
> >> On Feb 11, 2018, at 2:59 AM, Adam Borowski <kilobyte@angband.pl> wrote:
> >>
> >>> Does Debian make it easy to upgrade to a 64-bit kernel if you have a
> >>> 32-bit install?
> >>
> >> Quite easy, yeah. 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.
> >
It might make sense to retry those patches... if we want people to
move to 64bit kernels, it makes sense to provide complete emulation
for 32bit distros...
> At the risk of suggesting heresy, should we consider removing x86_32
> support at some point?
Heresy!
We still support 486s. I don't know if anyone really uses them, but
T40p is an acceptable machine to ssh from. X60 is still the machine I
prefer for traveling. Fast enough if you don't compile, and nicer
keyboard/screen than X220...
Pavel
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next prev parent reply other threads:[~2018-02-11 22:34 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-09 9:25 [PATCH 00/31 v2] PTI support for x86_32 Joerg Roedel
2018-02-09 9:25 ` [PATCH 01/31] x86/asm-offsets: Move TSS_sp0 and TSS_sp1 to asm-offsets.c Joerg Roedel
2018-02-09 9:25 ` [PATCH 02/31] x86/entry/32: Rename TSS_sysenter_sp0 to TSS_entry_stack Joerg Roedel
2018-02-09 9:25 ` [PATCH 03/31] x86/entry/32: Load task stack from x86_tss.sp1 in SYSENTER handler Joerg Roedel
2018-02-09 9:25 ` [PATCH 04/31] x86/entry/32: Put ESPFIX code into a macro Joerg Roedel
2018-02-09 9:25 ` [PATCH 05/31] x86/entry/32: Unshare NMI return path Joerg Roedel
2018-02-09 9:25 ` [PATCH 06/31] x86/entry/32: Split off return-to-kernel path Joerg Roedel
2018-02-09 9:25 ` [PATCH 07/31] x86/entry/32: Restore segments before int registers Joerg Roedel
2018-02-09 9:25 ` [PATCH 08/31] x86/entry/32: Enter the kernel via trampoline stack Joerg Roedel
2018-02-09 9:25 ` [PATCH 09/31] x86/entry/32: Leave " Joerg Roedel
2018-02-09 17:05 ` Linus Torvalds
2018-02-09 17:17 ` Denys Vlasenko
2018-02-10 15:26 ` David Laight
2018-02-10 20:18 ` Linus Torvalds
2018-02-09 17:43 ` Andy Lutomirski
2018-02-09 19:06 ` Joerg Roedel
2018-02-09 19:02 ` Joerg Roedel
2018-02-09 19:17 ` Linus Torvalds
2018-02-09 19:25 ` Joerg Roedel
2018-02-09 19:48 ` Linus Torvalds
2018-02-10 15:41 ` David Laight
2018-02-09 19:30 ` Denys Vlasenko
2018-02-09 9:25 ` [PATCH 10/31] x86/entry/32: Introduce SAVE_ALL_NMI and RESTORE_ALL_NMI Joerg Roedel
2018-02-09 9:25 ` [PATCH 11/31] x86/entry/32: Add PTI cr3 switches to NMI handler code Joerg Roedel
2018-02-09 9:25 ` [PATCH 12/31] x86/entry/32: Add PTI cr3 switch to non-NMI entry/exit points Joerg Roedel
2018-02-27 19:18 ` Waiman Long
2018-03-01 12:03 ` Joerg Roedel
2018-03-01 13:34 ` Joerg Roedel
2018-03-01 14:33 ` Waiman Long
2018-03-01 16:50 ` Joerg Roedel
2018-03-01 18:24 ` Brian Gerst
2018-03-01 18:36 ` Dave Hansen
2018-03-01 18:38 ` Linus Torvalds
2018-03-02 9:10 ` Joerg Roedel
2018-03-16 20:55 ` Andy Lutomirski
2018-03-02 9:07 ` Joerg Roedel
2018-02-09 9:25 ` [PATCH 13/31] x86/entry/32: Handle Entry from Kernel-Mode on Entry-Stack Joerg Roedel
2018-02-09 9:25 ` [PATCH 14/31] x86/pgtable/pae: Unshare kernel PMDs when PTI is enabled Joerg Roedel
2018-02-09 9:25 ` [PATCH 15/31] x86/pgtable/32: Allocate 8k page-tables " Joerg Roedel
2018-02-09 9:25 ` [PATCH 16/31] x86/pgtable: Move pgdp kernel/user conversion functions to pgtable.h Joerg Roedel
2018-02-09 9:25 ` [PATCH 17/31] x86/pgtable: Move pti_set_user_pgd() " Joerg Roedel
2018-02-09 9:25 ` [PATCH 18/31] x86/pgtable: Move two more functions from pgtable_64.h " Joerg Roedel
2018-02-09 9:25 ` [PATCH 19/31] x86/mm/pae: Populate valid user PGD entries Joerg Roedel
2018-02-14 9:45 ` Juergen Gross
2018-02-14 10:00 ` Joerg Roedel
2018-02-09 9:25 ` [PATCH 20/31] x86/mm/pae: Populate the user page-table with user pgd's Joerg Roedel
2018-02-09 17:48 ` Andy Lutomirski
2018-02-09 19:09 ` Joerg Roedel
2018-02-09 9:25 ` [PATCH 21/31] x86/mm/legacy: " Joerg Roedel
2018-02-09 9:25 ` [PATCH 22/31] x86/mm/pti: Add an overflow check to pti_clone_pmds() Joerg Roedel
2018-02-09 9:25 ` [PATCH 23/31] x86/mm/pti: Define X86_CR3_PTI_PCID_USER_BIT on x86_32 Joerg Roedel
2018-02-09 17:42 ` Andy Lutomirski
2018-02-09 9:25 ` [PATCH 24/31] x86/mm/pti: Clone CPU_ENTRY_AREA on PMD level " Joerg Roedel
2018-02-09 9:25 ` [PATCH 25/31] x86/mm/dump_pagetables: Define INIT_PGD Joerg Roedel
2018-02-09 9:25 ` [PATCH 26/31] x86/pgtable/pae: Use separate kernel PMDs for user page-table Joerg Roedel
2018-02-09 9:25 ` [PATCH 27/31] x86/ldt: Reserve address-space range on 32 bit for the LDT Joerg Roedel
2018-02-09 9:25 ` [PATCH 28/31] x86/ldt: Define LDT_END_ADDR Joerg Roedel
2018-02-09 9:25 ` [PATCH 29/31] x86/ldt: Split out sanity check in map_ldt_struct() Joerg Roedel
2018-02-09 9:25 ` [PATCH 30/31] x86/ldt: Enable LDT user-mapping for PAE Joerg Roedel
2018-02-09 9:25 ` [PATCH 31/31] x86/pti: Allow CONFIG_PAGE_TABLE_ISOLATION for x86_32 Joerg Roedel
2018-02-09 12:11 ` [PATCH 00/31 v2] PTI support " Juergen Gross
2018-02-09 13:35 ` Joerg Roedel
2018-02-09 13:54 ` Andrew Cooper
2018-02-09 17:47 ` Andy Lutomirski
2018-02-09 19:11 ` Joerg Roedel
2018-02-10 9:15 ` Adam Borowski
2018-02-10 20:22 ` Linus Torvalds
2018-02-11 10:59 ` Adam Borowski
2018-02-11 17:40 ` Mark D Rustad
2018-02-11 19:42 ` Andy Lutomirski
2018-02-11 20:14 ` Linus Torvalds
2018-02-11 22:12 ` James Bottomley
2018-02-11 22:30 ` Andy Lutomirski
2018-02-11 23:47 ` James Bottomley
2018-02-11 22:34 ` Pavel Machek [this message]
2018-02-11 23:25 ` Alan Cox
2018-02-12 10:16 ` Anders Larsen
2018-02-14 10:43 ` Pavel Machek
2018-02-15 3:44 ` joe.korty
2018-02-16 14:34 ` Pavel Machek
2018-02-13 8:54 ` Greg KH
2018-02-13 17:25 ` Linus Torvalds
2018-02-14 8:54 ` Greg KH
2018-02-21 10:26 ` Lorenzo Colitti
2018-02-21 16:59 ` Arnd Bergmann
2018-02-22 11:10 ` Greg KH
2018-02-22 11:18 ` Arnd Bergmann
2018-03-06 15:39 ` Jason A. Donenfeld
2018-02-11 19:13 ` Ingo Molnar
2018-02-12 14:51 ` Joerg Roedel
2018-02-09 21:09 ` Pavel Machek
2018-02-09 21:11 ` Linus Torvalds
2018-02-09 21:28 ` Andrew Cooper
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