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From: Ingo Molnar <mingo@kernel.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	Brad Spengler <spender@grsecurity.net>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH 0/9] user_mode_vm removal and associated cleanups
Date: Thu, 19 Mar 2015 07:33:12 +0100	[thread overview]
Message-ID: <20150319063312.GA7312@gmail.com> (raw)
In-Reply-To: <cover.1426728647.git.luto@kernel.org>

* Andy Lutomirski <luto@kernel.org> wrote:

> Hi all-
> 
> The user_mode vs user_mode_vm distinction scares me.  Let's fix it.
> This series adds user_mode_ignore_vm86, makes user_mode reliable,
> and removes user_mode_vm.  It also tidies up a couple warts I found
> along the way.
> 
> This survives basic testing, but I haven't tried that hard to test it.
> 
> Thoughts?
> 
> Ingo, this may conflict a bit with the do_debug and do_bounds fixes.

I like it, in fact I'd suggest we remove user_mode_ignore_vm86() 
altogether, as it's such a marginal optimization, it only affects 
x86-32 kernels, and because we keep getting this wrong.

Keep a single, simple user_mode() definition.


Thanks,

	Ingo

      parent reply	other threads:[~2015-03-19  6:33 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-19  1:33 [PATCH 0/9] user_mode_vm removal and associated cleanups Andy Lutomirski
2015-03-19  1:33 ` [PATCH 1/9] x86, fault: Use TASK_SIZE_MAX in is_prefetch Andy Lutomirski
2015-03-23 12:20   ` [tip:x86/asm] x86/mm/fault: Use TASK_SIZE_MAX in is_prefetch() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 2/9] x86, perf: Fix incorrect TIF_IA32 check in code_segment_base Andy Lutomirski
2015-03-23 12:20   ` [tip:x86/asm] x86/asm/entry, perf: Fix incorrect TIF_IA32 check in code_segment_base() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 3/9] x86: Add user_mode_ignore_vm86 Andy Lutomirski
2015-03-23 12:26   ` [tip:x86/asm] x86/asm/entry: Add user_mode_ignore_vm86() tip-bot for Andy Lutomirski
2015-03-23 19:38     ` Andy Lutomirski
2015-03-24 19:44       ` Ingo Molnar
2015-03-24 19:46         ` Andy Lutomirski
2015-03-27 13:48           ` Denys Vlasenko
2015-03-29  7:08             ` Ingo Molnar
2015-03-29  9:02               ` [PATCH] x86/asm/entry: Remove user_mode_ignore_vm86() Ingo Molnar
2015-03-29 12:13                 ` Borislav Petkov
2015-03-29 13:24                   ` Andy Lutomirski
2015-03-31 12:39                 ` [tip:x86/asm] " tip-bot for Ingo Molnar
2015-03-29 11:55               ` [tip:x86/asm] x86/asm/entry: Add user_mode_ignore_vm86() Borislav Petkov
2015-03-29 20:51               ` Denys Vlasenko
2015-03-19  1:33 ` [PATCH 4/9] x86, perf: Explicitly optimize vm86 handling in code_segment_base Andy Lutomirski
2015-03-23 12:26   ` [tip:x86/asm] x86/asm/entry, perf: Explicitly optimize vm86 handling in code_segment_base() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 5/9] x86, traps: Use user_mode_ignore_vm86 where appropriate Andy Lutomirski
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Use user_mode_ignore_vm86() " tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 6/9] x86: Make user_mode work correctly if regs came from vm86 mode Andy Lutomirski
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Make user_mode() work correctly if regs came from VM86 mode tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 7/9] x86, treewide: s/user_mode_vm/user_mode/g Andy Lutomirski
2015-03-23 12:27   ` [tip:x86/asm] x86/asm/entry: Change all 'user_mode_vm()' calls to 'user_mode()' tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 8/9] x86: Remove user_mode_vm Andy Lutomirski
2015-03-23 12:28   ` [tip:x86/asm] x86/asm/entry: Remove user_mode_vm() tip-bot for Andy Lutomirski
2015-03-19  1:33 ` [PATCH 9/9] x86, traps: Replace some open-coded vm86 checks with v8086_mode Andy Lutomirski
2015-03-23 12:28   ` [tip:x86/asm] x86/asm/entry: Replace some open-coded VM86 checks with v8086_mode() checks tip-bot for Andy Lutomirski
2015-03-19  6:33 ` Ingo Molnar [this message]

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