Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault | KernelTrap

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault

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From: Avi Kivity

Subject: Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault

Date: Friday, July 16, 2010 - 11:28 am

On 07/16/2010 09:17 PM, H. Peter Anvin wrote:
quoted text>
>> I think the concern here is about an NMI handler's code running in
>> vmalloc space, or is it something else?
>>
>>      
> Code or data, yes; including percpu data.
>    

Use kmalloc and percpu pointers, it's not that onerous.

Oh, and you can access vmalloc space by switching cr3 temporarily to 
init_mm's, no?  Obviously not a very performant solution, at least 
without PCIDs, but can be used if needed.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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Messages in current thread:

[patch 0/2] x86: NMI-safe trap handlers, Mathieu Desnoyers, (Wed Jul 14, 8:49 am)

[patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 8:49 am)

[patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Wed Jul 14, 8:49 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 9:28 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Maciej W. Rozycki, (Wed Jul 14, 9:42 am)

Re: [patch 0/2] x86: NMI-safe trap handlers, Andi Kleen, (Wed Jul 14, 10:06 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 10:06 am)

Re: [patch 0/2] x86: NMI-safe trap handlers, Mathieu Desnoyers, (Wed Jul 14, 10:08 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 11:10 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Wed Jul 14, 11:12 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Wed Jul 14, 11:46 am)

Re: [patch 0/2] x86: NMI-safe trap handlers, Andi Kleen, (Wed Jul 14, 11:56 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 12:14 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Maciej W. Rozycki, (Wed Jul 14, 12:21 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Wed Jul 14, 12:36 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 12:41 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 12:54 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Wed Jul 14, 12:56 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Wed Jul 14, 12:58 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 1:05 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Wed Jul 14, 1:07 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Wed Jul 14, 1:08 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 1:17 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Maciej W. Rozycki, (Wed Jul 14, 1:36 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 1:39 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 1:55 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Wed Jul 14, 2:18 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 2:23 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Maciej W. Rozycki, (Wed Jul 14, 2:45 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 2:52 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Wed Jul 14, 3:14 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 3:21 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 3:31 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Maciej W. Rozycki, (Wed Jul 14, 3:31 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Wed Jul 14, 3:31 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 3:37 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Wed Jul 14, 3:48 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Jeremy Fitzhardinge, (Wed Jul 14, 3:51 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 3:56 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 4:02 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Wed Jul 14, 4:09 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Jul 14, 4:11 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 4:22 pm)

Re: [patch 0/2] x86: NMI-safe trap handlers, Tejun Heo, (Wed Jul 14, 4:29 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Tejun Heo, (Wed Jul 14, 4:32 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Wed Jul 14, 4:38 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Wed Jul 14, 4:40 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Jeremy Fitzhardinge, (Wed Jul 14, 4:54 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 6:23 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Wed Jul 14, 6:45 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Thu Jul 15, 7:11 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Thu Jul 15, 7:35 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Thu Jul 15, 7:46 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 7:51 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 8:38 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 9:26 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 9:44 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 9:49 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 10:38 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 11:31 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 11:43 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 11:48 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 1:44 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 3:01 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 3:16 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 3:24 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 3:26 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Jul 15, 3:30 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 3:46 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Thu Jul 15, 3:58 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 4:20 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 4:23 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 4:41 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Thu Jul 15, 4:44 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, H. Peter Anvin, (Thu Jul 15, 4:46 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Andi Kleen, (Thu Jul 15, 4:48 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Fri Jul 16, 3:47 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Fri Jul 16, 4:21 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Fri Jul 16, 4:43 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Fri Jul 16, 5:00 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 5:28 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Fri Jul 16, 5:54 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Fri Jul 16, 7:49 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 8:34 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Fri Jul 16, 8:40 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 9:47 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Fri Jul 16, 9:58 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 10:54 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, H. Peter Anvin, (Fri Jul 16, 11:05 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 11:15 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, H. Peter Anvin, (Fri Jul 16, 11:17 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Fri Jul 16, 11:22 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Linus Torvalds, (Fri Jul 16, 11:25 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 11:28 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 11:32 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Linus Torvalds, (Fri Jul 16, 11:37 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Fri Jul 16, 12:13 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 12:26 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 12:28 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, H. Peter Anvin, (Fri Jul 16, 12:29 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 12:30 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 12:32 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 12:32 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 12:34 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Fri Jul 16, 12:39 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Linus Torvalds, (Fri Jul 16, 2:39 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 3:07 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Linus Torvalds, (Fri Jul 16, 3:26 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Mathieu Desnoyers, (Fri Jul 16, 3:40 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Andi Kleen, (Fri Jul 16, 3:41 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Linus Torvalds, (Fri Jul 16, 6:15 pm)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Sun Jul 18, 2:23 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Avi Kivity, (Sun Jul 18, 2:26 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Sun Jul 18, 4:03 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Sun Jul 18, 10:36 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Sun Jul 18, 11:04 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Sun Jul 18, 11:17 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Sun Jul 18, 11:22 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Sun Jul 18, 11:43 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Sun Jul 18, 12:26 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Mon Jul 19, 12:32 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Tue Aug 3, 10:18 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Tue Aug 3, 11:25 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Tue Aug 3, 11:56 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Tue Aug 3, 12:45 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Linus Torvalds, (Tue Aug 3, 1:02 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Tue Aug 3, 1:10 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Tue Aug 3, 1:21 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Tue Aug 3, 1:54 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Tue Aug 3, 2:16 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Tue Aug 3, 11:27 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Dave Chinner, (Tue Aug 3, 11:46 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Tue Aug 3, 11:46 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Wed Aug 4, 12:14 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Ingo Molnar, (Wed Aug 4, 12:21 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, Peter Zijlstra, (Wed Aug 4, 2:46 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Aug 4, 7:06 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Wed Aug 4, 7:45 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Wed Aug 4, 7:50 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Wed Aug 4, 7:56 am)

Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault, H. Peter Anvin, (Wed Aug 4, 1:23 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Aug 5, 6:42 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Thu Aug 5, 6:49 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Masami Hiramatsu, (Thu Aug 5, 11:18 pm)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Fri Aug 6, 2:50 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Fri Aug 6, 2:51 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Fri Aug 6, 3:11 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Peter Zijlstra, (Fri Aug 6, 4:14 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Fri Aug 6, 6:37 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Fri Aug 6, 6:46 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Fri Aug 6, 7:13 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Fri Aug 6, 7:15 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Masami Hiramatsu, (Sat Aug 7, 2:51 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Frederic Weisbecker, (Mon Aug 9, 9:53 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Wed Aug 11, 7:34 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Steven Rostedt, (Wed Aug 11, 7:44 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Sun Aug 15, 6:35 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Sun Aug 15, 9:33 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Sun Aug 15, 9:44 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Sun Aug 15, 9:51 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Mathieu Desnoyers, (Sun Aug 15, 11:31 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Mon Aug 16, 3:49 am)

Re: [patch 1/2] x86_64 page fault NMI-safe, Avi Kivity, (Mon Aug 16, 4:29 am)

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