Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops | KernelTrap

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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From: David Newall <david@...>

To: Krzysztof Halasa <khc@...>

Cc: Rene Herman <rene.herman@...>, Pavel Machek <pavel@...>, Andi Kleen <andi@...>, Alan Cox <alan@...>, David P. Reed <dpreed@...>, <linux-kernel@...>, Thomas Gleixner <tglx@...>, Ingo Molnar <mingo@...>, H. Peter Anvin <hpa@...>

Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

Date: Monday, December 10, 2007 - 9:10 pm

Where did the 8us delay come from?  The documentation and source is 
careful not to say how long the delay is.  Would changing it to, say 
1us, be technically wrong?  Is code that requires 8us correct?
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Messages in current thread:

RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64..., David P. Reed, (Thu Dec 6, 6:38 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Fri Dec 7, 6:44 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Fri Dec 7, 12:04 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Sun Dec 9, 8:54 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Sun Dec 9, 12:59 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Sun Dec 9, 5:25 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Mon Dec 10, 12:17 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Krzysztof Halasa, (Mon Dec 10, 7:30 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David Newall, (Mon Dec 10, 9:10 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Mon Dec 10, 9:25 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 2:54 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Tue Dec 11, 1:01 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David Newall, (Mon Dec 10, 9:42 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Tue Dec 11, 9:14 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Tue Dec 11, 9:32 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Tue Dec 11, 9:47 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Tue Dec 11, 9:50 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Ingo Molnar, (Fri Dec 14, 9:33 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Paul Rolland, (Tue Dec 11, 3:40 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 5:50 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David Newall, (Tue Dec 11, 8:08 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 9:16 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David Newall, (Tue Dec 11, 9:50 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Tue Dec 11, 11:41 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Tue Dec 11, 12:30 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 12:50 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Tue Dec 11, 3:16 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 4:00 pm)

More info on port 80 symptoms on MCP51 machine., David P. Reed, (Wed Dec 12, 4:07 pm)

Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Wed Dec 12, 4:26 pm)

Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Wed Dec 12, 4:58 pm)

Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Wed Dec 12, 5:05 pm)

Re: More info on port 80 symptoms on MCP51 machine., Chuck Ebbert, (Fri Dec 14, 6:05 pm)

Re: More info on port 80 symptoms on MCP51 machine., Rene Herman, (Sat Dec 15, 3:22 am)

Re: More info on port 80 symptoms on MCP51 machine., Alan Cox, (Wed Dec 12, 5:01 pm)

Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Wed Dec 12, 5:12 pm)

RE: More info on port 80 symptoms on MCP51 machine., Allen Martin, (Sat Dec 15, 6:34 pm)

Re: More info on port 80 symptoms on MCP51 machine., H. Peter Anvin, (Sat Dec 15, 6:46 pm)

Re: More info on port 80 symptoms on MCP51 machine., Alan Cox, (Wed Dec 12, 5:29 pm)

Re: More info on port 80 symptoms on MCP51 machine., David P. Reed, (Wed Dec 12, 4:37 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 4:00 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 3:59 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 3:59 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Tue Dec 11, 1:00 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 1:04 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Tue Dec 11, 3:18 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 1:27 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Tue Dec 11, 10:25 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David Newall, (Wed Dec 12, 6:18 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Wed Dec 12, 7:00 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Thu Dec 13, 9:13 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Thu Dec 13, 9:21 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Thu Dec 13, 9:50 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Fri Dec 14, 11:16 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 10:14 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Paul Rolland, (Tue Dec 11, 9:32 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 10:15 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 11:28 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., John Stoffel, (Tue Dec 11, 12:32 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 12:40 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Paul Rolland, (Tue Dec 11, 11:37 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 11:53 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Tue Dec 11, 12:58 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Tue Dec 11, 1:32 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Tue Dec 11, 3:19 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Tue Dec 11, 4:27 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Tue Dec 11, 7:56 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., linux-os (Dick Johnson), (Wed Dec 12, 9:11 am)

Attitude problems., David P. Reed, (Wed Dec 12, 3:42 pm)

Re: Attitude problems., linux-os (Dick Johnson), (Wed Dec 12, 4:31 pm)

Re: Attitude problems., linux-os (Dick Johnson), (Fri Dec 14, 12:01 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Wed Dec 12, 12:12 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Ingo Molnar, (Fri Dec 14, 10:33 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 4:34 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Tue Dec 11, 5:03 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Tue Dec 11, 4:16 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Tue Dec 11, 3:36 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Tue Dec 11, 1:05 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Tue Dec 11, 1:01 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Mon Dec 10, 9:51 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Mon Dec 10, 9:46 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Ondrej Zary, (Mon Dec 10, 2:02 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Mon Dec 10, 8:08 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Sun Dec 9, 6:29 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Sun Dec 9, 7:22 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Mon Dec 10, 8:02 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Ondrej Zary, (Sun Dec 9, 11:54 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Dr. David Alan Gilbert, (Sun Dec 9, 9:41 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Sat Dec 8, 3:25 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Lennart Sorensen, (Tue Dec 11, 11:14 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Sun Dec 9, 9:22 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Sun Dec 9, 1:04 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Sat Dec 8, 4:26 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Tue Dec 11, 1:58 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Sat Dec 8, 3:50 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Sat Dec 8, 4:47 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Sat Dec 8, 5:04 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Fri Dec 7, 12:31 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Fri Dec 7, 1:19 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Fri Dec 7, 2:45 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Fri Dec 7, 2:42 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Fri Dec 7, 3:25 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Fri Dec 7, 5:45 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., David P. Reed, (Fri Dec 7, 10:50 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Pavel Machek, (Wed Dec 5, 7:10 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Fri Dec 7, 8:21 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Andi Kleen, (Fri Dec 7, 10:54 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Tue Dec 11, 1:53 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Fri Dec 7, 11:43 am)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Rene Herman, (Fri Dec 7, 12:28 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., H. Peter Anvin, (Mon Dec 10, 8:31 pm)

Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern A..., Alan Cox, (Thu Dec 6, 8:15 pm)

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