From: Dave Hansen <dave@sr71.net>
To: Andy Lutomirski <luto@amacapital.net>, linux-kernel@vger.kernel.org
Cc: tglx@linutronix.de, x86@kernel.org
Subject: Re: [RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit kernels
Date: Fri, 12 Dec 2014 12:27:42 -0800 [thread overview]
Message-ID: <548B4FBE.5090101@sr71.net> (raw)
In-Reply-To: <548B4E75.5010507@amacapital.net>
On 12/12/2014 12:22 PM, Andy Lutomirski wrote:
> On 12/12/2014 11:12 AM, Dave Hansen wrote:
>> This is 3.20 material. I'm hoping to get some comments early
>> in case folks have some issues with the way it's being done.
>>
>> The MPX hardware structures differ in layout in 32 and 64-bit
>> mode. A 32-bit binary running on a 64-bit kernel needs the
>> 32-bit structures, so we need code which switches between
>> the two modes.
>
> The OS community figured out years ago that you aren't supposed to do
> this. Did everyone forget to tell the hardware people?
What is your concern with it, exactly?
You want the same size structures with the same format for 32-bit and
64-bit modes?
next prev parent reply other threads:[~2014-12-12 20:27 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-12 19:12 [RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit kernels Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 1/8] x86: make is_64bit_mm() widely available Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 2/8] x86: make __VIRTUAL_MASK safe to use on 32 bit Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 3/8] x86, mpx: we do not allocate the bounds directory Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 4/8] x86, mpx: remove redundant MPX_BNDCFG_ADDR_MASK Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 5/8] x86, mpx: Add temporary variable to reduce masking Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 6/8] x86, mpx: new directory entry to addr helper Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 7/8] x86, mpx: do 32-bit-only cmpxchg for 32-bit apps Dave Hansen
2014-12-12 19:12 ` [RFC][PATCH 8/8] x86, mpx: support 32bit binaries on 64bit kernel Dave Hansen
2014-12-12 20:22 ` [RFC][PATCH 0/8] x86, mpx: Support 32-bit binaries on 64-bit kernels Andy Lutomirski
2014-12-12 20:27 ` Dave Hansen [this message]
2014-12-12 20:48 ` Andy Lutomirski
2014-12-12 21:41 ` Dave Hansen
2014-12-12 23:04 ` Andy Lutomirski
2014-12-12 23:16 ` Dave Hansen
2014-12-13 0:11 ` Andy Lutomirski
2014-12-13 0:23 ` Dave Hansen
2014-12-13 1:45 ` Andy Lutomirski
2014-12-13 15:50 ` Dave Hansen
2014-12-12 20:27 ` Andy Lutomirski
2014-12-12 20:35 ` Dave Hansen
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