From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
daniel.gruss@iaik.tugraz.at, hughd@google.com,
keescook@google.com, linux-mm@kvack.org,
michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
richard.fellner@student.tugraz.at
Subject: Re: [patch V2 5/5] x86/kaiser: Add boottime disable switch
Date: Mon, 27 Nov 2017 13:49:52 +0100 [thread overview]
Message-ID: <20171127124952.m6rw72kkufzyneco@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.20.1711271250001.1799@nanos>
On Mon, Nov 27, 2017 at 12:50:45PM +0100, Thomas Gleixner wrote:
> On Mon, 27 Nov 2017, Peter Zijlstra wrote:
> > On Mon, Nov 27, 2017 at 10:48:46AM +0100, Peter Zijlstra wrote:
> > > So in patch 15 Andy notes that we should probably also disable the
> > > SYSCALL trampoline when we disable KAISER.
> > >
> > > https://lkml.kernel.org/r/20171124172411.19476-16-mingo@kernel.org
> >
> > Could be a simple as this.. but I've not tested.
>
> That's only one part of it. I think we need to fiddle with the exit side as
> well.
So I assumed that the patches were bisectable. From that I figured the
exit path (patch 14 in that set) would work either way.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
Borislav Petkov <bp@alien8.de>, Brian Gerst <brgerst@gmail.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
daniel.gruss@iaik.tugraz.at, hughd@google.com,
keescook@google.com, linux-mm@kvack.org,
michael.schwarz@iaik.tugraz.at, moritz.lipp@iaik.tugraz.at,
richard.fellner@student.tugraz.at
Subject: Re: [patch V2 5/5] x86/kaiser: Add boottime disable switch
Date: Mon, 27 Nov 2017 13:49:52 +0100 [thread overview]
Message-ID: <20171127124952.m6rw72kkufzyneco@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.20.1711271250001.1799@nanos>
On Mon, Nov 27, 2017 at 12:50:45PM +0100, Thomas Gleixner wrote:
> On Mon, 27 Nov 2017, Peter Zijlstra wrote:
> > On Mon, Nov 27, 2017 at 10:48:46AM +0100, Peter Zijlstra wrote:
> > > So in patch 15 Andy notes that we should probably also disable the
> > > SYSCALL trampoline when we disable KAISER.
> > >
> > > https://lkml.kernel.org/r/20171124172411.19476-16-mingo@kernel.org
> >
> > Could be a simple as this.. but I've not tested.
>
> That's only one part of it. I think we need to fiddle with the exit side as
> well.
So I assumed that the patches were bisectable. From that I figured the
exit path (patch 14 in that set) would work either way.
--
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next prev parent reply other threads:[~2017-11-27 12:50 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-26 23:14 [patch V2 0/5] x86/kaiser: Boot time disabling and debug support Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-26 23:14 ` [patch V2 1/5] x86/kaiser: Respect disabled CPU features Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-27 9:57 ` Peter Zijlstra
2017-11-27 9:57 ` Peter Zijlstra
2017-11-27 11:47 ` Thomas Gleixner
2017-11-27 11:47 ` Thomas Gleixner
2017-11-27 12:31 ` Brian Gerst
2017-11-27 12:31 ` Brian Gerst
2017-11-27 13:18 ` Thomas Gleixner
2017-11-27 13:18 ` Thomas Gleixner
2017-11-27 18:11 ` Dave Hansen
2017-11-27 18:11 ` Dave Hansen
2017-11-27 18:37 ` Kees Cook
2017-11-27 18:37 ` Kees Cook
2017-11-26 23:14 ` [patch V2 2/5] x86/kaiser: Simplify disabling of global pages Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-27 11:49 ` Thomas Gleixner
2017-11-27 11:49 ` Thomas Gleixner
2017-11-27 18:15 ` Dave Hansen
2017-11-27 18:15 ` Dave Hansen
2017-11-27 20:28 ` Thomas Gleixner
2017-11-27 20:28 ` Thomas Gleixner
2017-11-26 23:14 ` [patch V2 3/5] x86/dump_pagetables: Check KAISER shadow page table for WX pages Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-27 18:17 ` Dave Hansen
2017-11-27 18:17 ` Dave Hansen
2017-11-26 23:14 ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-27 9:41 ` Peter Zijlstra
2017-11-27 9:41 ` Peter Zijlstra
2017-11-27 10:06 ` [PATCH] vfs: Add PERM_* symbolic helpers for common file mode/permissions Ingo Molnar
2017-11-27 10:06 ` Ingo Molnar
2017-11-27 19:21 ` Linus Torvalds
2017-11-27 19:21 ` Linus Torvalds
2017-11-28 10:54 ` Ingo Molnar
2017-11-28 10:54 ` Ingo Molnar
2017-11-28 11:12 ` Ingo Molnar
2017-11-28 11:12 ` Ingo Molnar
2017-11-29 8:52 ` Michael Ellerman
2017-11-29 8:52 ` Michael Ellerman
2017-11-27 18:18 ` [patch V2 4/5] x86/mm/debug_pagetables: Allow dumping current pagetables Dave Hansen
2017-11-27 18:18 ` Dave Hansen
2017-11-26 23:14 ` [patch V2 5/5] x86/kaiser: Add boottime disable switch Thomas Gleixner
2017-11-26 23:14 ` Thomas Gleixner
2017-11-27 9:48 ` Peter Zijlstra
2017-11-27 9:48 ` Peter Zijlstra
2017-11-27 10:22 ` Peter Zijlstra
2017-11-27 10:22 ` Peter Zijlstra
2017-11-27 11:50 ` Thomas Gleixner
2017-11-27 11:50 ` Thomas Gleixner
2017-11-27 12:49 ` Peter Zijlstra [this message]
2017-11-27 12:49 ` Peter Zijlstra
2017-11-27 21:43 ` Peter Zijlstra
2017-11-27 21:43 ` Peter Zijlstra
2017-11-27 18:22 ` Dave Hansen
2017-11-27 18:22 ` Dave Hansen
2017-11-27 19:00 ` Thomas Gleixner
2017-11-27 19:00 ` Thomas Gleixner
2017-11-27 19:18 ` Josh Poimboeuf
2017-11-27 19:18 ` Josh Poimboeuf
2017-11-27 20:47 ` Thomas Gleixner
2017-11-27 20:47 ` Thomas Gleixner
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