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From: Thomas Gleixner <tglx@linutronix.de>
To: Borislav Petkov <bp@alien8.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	the arch/x86 maintainers <x86@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Lutomirski <luto@kernel.org>,
	Jiri Kosina <jkosina@suse.cz>,
	thomas.lendacky@amd.com, Andrea Arcangeli <aarcange@redhat.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Andi Kleen <ak@linux.intel.com>,
	dave.hansen@intel.com,
	Casey Schaufler <casey.schaufler@intel.com>,
	"Mallick, Asit K" <asit.k.mallick@intel.com>,
	"Van De Ven, Arjan" <arjan@linux.intel.com>,
	jcm@redhat.com, longman9394@gmail.com,
	Greg KH <gregkh@linuxfoundation.org>,
	david.c.stewart@intel.com, Kees Cook <keescook@chromium.org>,
	Tim Chen <tim.c.chen@linux.intel.com>
Subject: Re: [patch 01/24] x86/speculation: Update the TIF_SSBD comment
Date: Thu, 22 Nov 2018 22:17:44 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.21.1811222215360.1665@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20181122175229.GD10365@zn.tnic>

On Thu, 22 Nov 2018, Borislav Petkov wrote:
> On Thu, Nov 22, 2018 at 11:30:04AM -0600, Josh Poimboeuf wrote:
> > But it does describe its purpose, especially in relation to the
> > 'spectre_v2=' option.
> 
> Sure, but the thing I'm proposing
> 
> spectre_v2_task_isol=
> 
> describes it more precisely, IMHO. :)
> 
> I.e., "enable/disable spectre v2 task isolation".
> 
> > Previously 'spectre_v2=' might have been more appropriately named
> > 'spectre_v2_kernel=' because it only protected the kernel from Spectre
> > v2 attacks.  Now with these new patches, 'spectre_v2=on' will protect
> > the entire system.
> 
> Hmmm, crazy idea: can we extend the options of spectre_v2= nstead?
> 
> spectre_v2=user_isolation,...
> spectre_v2=kernel,...
> spectre_v2=task_isolation,...
> 
> and so on?
> 
> This way we can do a couple of option switches in one go.

That's results in a huge parser state space and changes the existing
interface. We stay with the separate option.

Thanks,

	tglx

  reply	other threads:[~2018-11-22 21:17 UTC|newest]

Thread overview: 95+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-21 20:14 [patch 00/24] x86/speculation: Remedy the STIBP/IBPB overhead Thomas Gleixner
2018-11-21 20:14 ` [patch 01/24] x86/speculation: Update the TIF_SSBD comment Thomas Gleixner
2018-11-21 20:28   ` Linus Torvalds
2018-11-21 20:30     ` Thomas Gleixner
2018-11-21 20:33     ` Linus Torvalds
2018-11-21 22:48       ` Thomas Gleixner
2018-11-21 22:53         ` Borislav Petkov
2018-11-21 22:55           ` Thomas Gleixner
2018-11-21 22:55           ` Arjan van de Ven
2018-11-21 22:56             ` Borislav Petkov
2018-11-21 23:07               ` Borislav Petkov
2018-11-21 23:04         ` Josh Poimboeuf
2018-11-21 23:08           ` Borislav Petkov
2018-11-22 17:30             ` Josh Poimboeuf
2018-11-22 17:52               ` Borislav Petkov
2018-11-22 21:17                 ` Thomas Gleixner [this message]
2018-11-21 20:14 ` [patch 02/24] x86/speculation: Clean up spectre_v2_parse_cmdline() Thomas Gleixner
2018-11-21 20:14 ` [patch 03/24] x86/speculation: Remove unnecessary ret variable in cpu_show_common() Thomas Gleixner
2018-11-21 20:14 ` [patch 04/24] x86/speculation: Reorganize cpu_show_common() Thomas Gleixner
2018-11-21 20:14 ` [patch 05/24] x86/speculation: Disable STIBP when enhanced IBRS is in use Thomas Gleixner
2018-11-21 20:33   ` Borislav Petkov
2018-11-21 20:36     ` Thomas Gleixner
2018-11-21 22:01       ` Thomas Gleixner
2018-11-21 20:14 ` [patch 06/24] x86/speculation: Rename SSBD update functions Thomas Gleixner
2018-11-21 20:14 ` [patch 07/24] x86/speculation: Reorganize speculation control MSRs update Thomas Gleixner
2018-11-21 20:14 ` [patch 08/24] sched/smt: Make sched_smt_present track topology Thomas Gleixner
2018-11-21 20:14 ` [patch 09/24] x86/Kconfig: Select SCHED_SMT if SMP enabled Thomas Gleixner
2018-11-21 20:14 ` [patch 10/24] sched/smt: Expose sched_smt_present static key Thomas Gleixner
2018-11-21 20:41   ` Thomas Gleixner
2018-11-21 20:14 ` [patch 11/24] x86/speculation: Rework SMT state change Thomas Gleixner
2018-11-21 20:14 ` [patch 12/24] x86/l1tf: Show actual SMT state Thomas Gleixner
2018-11-21 20:14 ` [patch 13/24] x86/speculation: Reorder the spec_v2 code Thomas Gleixner
2018-11-21 20:14 ` [patch 14/24] x86/speculation: Unify conditional spectre v2 print functions Thomas Gleixner
2018-11-22  7:59   ` Ingo Molnar
2018-11-21 20:14 ` [patch 15/24] x86/speculation: Add command line control for indirect branch speculation Thomas Gleixner
2018-11-21 23:43   ` Borislav Petkov
2018-11-22  8:14     ` Thomas Gleixner
2018-11-22  9:07       ` Thomas Gleixner
2018-11-22  9:18       ` Peter Zijlstra
2018-11-22 10:10         ` Borislav Petkov
2018-11-22 10:48           ` Thomas Gleixner
2018-11-21 20:14 ` [patch 16/24] x86/speculation: Prepare for per task indirect branch speculation control Thomas Gleixner
2018-11-22  7:57   ` Ingo Molnar
2018-11-21 20:14 ` [patch 17/24] x86/speculation: Move IBPB control out of switch_mm() Thomas Gleixner
2018-11-22  0:01   ` Andi Kleen
2018-11-22  7:42     ` Jiri Kosina
2018-11-22  9:18       ` Thomas Gleixner
2018-11-22  1:40   ` Tim Chen
2018-11-22  7:52   ` Ingo Molnar
2018-11-22 22:29     ` Thomas Gleixner
2018-11-21 20:14 ` [patch 18/24] x86/speculation: Avoid __switch_to_xtra() calls Thomas Gleixner
2018-11-22  1:23   ` Tim Chen
2018-11-22  7:44     ` Ingo Molnar
2018-11-21 20:14 ` [patch 19/24] ptrace: Remove unused ptrace_may_access_sched() and MODE_IBRS Thomas Gleixner
2018-11-21 20:14 ` [patch 20/24] x86/speculation: Split out TIF update Thomas Gleixner
2018-11-22  2:13   ` Tim Chen
2018-11-22 23:00     ` Thomas Gleixner
2018-11-23  7:37       ` Ingo Molnar
2018-11-26 18:35         ` Tim Chen
2018-11-26 21:55           ` Thomas Gleixner
2018-11-27  7:05             ` Jiri Kosina
2018-11-27  7:13               ` Thomas Gleixner
2018-11-27  7:30                 ` Jiri Kosina
2018-11-27 12:52                   ` Jiri Kosina
2018-11-27 13:18                     ` Jiri Kosina
2018-11-27 21:57                     ` Thomas Gleixner
2018-11-27 22:07                       ` Jiri Kosina
2018-11-27 22:20                         ` Jiri Kosina
2018-11-27 22:36                         ` Thomas Gleixner
2018-11-28  1:50                           ` Tim Chen
2018-11-28 10:43                             ` Thomas Gleixner
2018-11-28  6:05                           ` Jiri Kosina
2018-11-28 14:33                       ` [tip:x86/pti] x86/speculation: Prevent stale SPEC_CTRL msr content tip-bot for Thomas Gleixner
2018-11-22  7:43   ` [patch 20/24] x86/speculation: Split out TIF update Ingo Molnar
2018-11-22 23:04     ` Thomas Gleixner
2018-11-23  7:37       ` Ingo Molnar
2018-11-21 20:14 ` [patch 21/24] x86/speculation: Prepare arch_smt_update() for PRCTL mode Thomas Gleixner
2018-11-22  7:34   ` Ingo Molnar
2018-11-22 23:17     ` Thomas Gleixner
2018-11-22 23:28       ` Jiri Kosina
2018-11-21 20:14 ` [patch 22/24] x86/speculation: Create PRCTL interface to restrict indirect branch speculation Thomas Gleixner
2018-11-22  7:10   ` Ingo Molnar
2018-11-22  9:03   ` Peter Zijlstra
2018-11-22  9:08     ` Thomas Gleixner
2018-11-22 12:26   ` Borislav Petkov
2018-11-22 12:33     ` Peter Zijlstra
2018-11-21 20:14 ` [patch 23/24] x86/speculation: Enable PRCTL mode for spectre_v2_app2app Thomas Gleixner
2018-11-22  7:17   ` Ingo Molnar
2018-11-21 20:14 ` [patch 24/24] x86/speculation: Add seccomp Spectre v2 app to app protection mode Thomas Gleixner
2018-11-22  2:24   ` Tim Chen
2018-11-22  7:26   ` Ingo Molnar
2018-11-22 23:45     ` Thomas Gleixner
2018-11-21 23:48 ` [patch 00/24] x86/speculation: Remedy the STIBP/IBPB overhead Tim Chen
2018-11-22  9:55   ` Thomas Gleixner
2018-11-22  9:45 ` Peter Zijlstra

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