Re: [PATCH] x86: Construct 32 bit boot time page tables in native format. | KernelTrap

Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

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From: H. Peter Anvin <hpa@...>

To: Pavel Machek <pavel@...>

Cc: Rafael J. Wysocki <rjw@...>, Jeremy Fitzhardinge <jeremy@...>, Ian Campbell <ijc@...>, Ingo Molnar <mingo@...>, Mika Penttilä <mika.penttila@...>, <linux-kernel@...>, Thomas Gleixner <tglx@...>, Ingo Molnar <mingo@...>, Eric W. Biederman <ebiederm@...>

Subject: Re: [PATCH] x86: Construct 32 bit boot time page tables in native format.

Date: Thursday, January 24, 2008 - 8:27 pm

Pavel Machek wrote:
quoted text>>>
>> I just looked at the ACPI suspend code, and it looks like it hacks its own 
>> identity map at runtime.  Pavel, am I reading that code right?
> 
> Yes, I think so, I believe we do it on both 32 and 64 bit now.
> 

So the background to this... we need an identity map to trampoline at 
early boot, obviously, but we'd like it to not stick around more than 
necessary.  We have zap_low_mappings() now but it's not really sufficient.

Secondary SMP processors need these mappings during trampolining -- 
presumably including CPU hotplug -- and I'm suspecting it might simply 
make sense to use a separate set of page tables (with both the identity 
and the kernel map) for trampolining and just keep them around.  That 
way they would be usable for ACPI as well.

quoted text> (It is early here. And I almost got the .c wakeup code to work... it
> already sets the mode).

Sweet!

	-hpa
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Messages in current thread:

[PATCH] x86/voyager: Switch voyager memory detection to earl..., Ian Campbell, (Sat Jan 19, 12:08 pm)

[PATCH] x86: Construct 32 bit boot time page tables in nativ..., Ian Campbell, (Sat Jan 19, 12:08 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Mika Penttilä, (Sun Jan 20, 2:30 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Mon Jan 21, 5:23 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 21, 5:38 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Mon Jan 21, 5:46 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 21, 10:16 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Tue Jan 22, 1:36 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Tue Jan 22, 2:23 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Tue Jan 22, 3:48 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Tue Jan 22, 4:00 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Tue Jan 22, 4:36 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Wed Jan 23, 4:52 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Wed Jan 23, 9:06 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Thu Jan 24, 5:39 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 6:06 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 6:35 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 6:39 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 6:58 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 7:08 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 7:40 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 7:51 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Pavel Machek, (Thu Jan 24, 8:20 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 8:27 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Pavel Machek, (Fri Jan 25, 3:49 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Fri Jan 25, 6:02 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Mon Jan 28, 11:00 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Mon Jan 28, 12:12 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 1:02 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Fri Feb 1, 9:51 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Fri Feb 1, 10:28 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Fri Feb 1, 10:54 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Len Brown, (Fri Feb 1, 6:55 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 11:25 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Pavel Machek, (Mon Jan 28, 3:40 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 4:26 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Mon Jan 28, 4:44 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 4:50 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 28, 5:28 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 6:02 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 28, 4:31 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 4:59 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 28, 3:51 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Mon Jan 28, 4:03 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Mon Jan 28, 4:06 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Mon Jan 28, 4:28 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Pavel Machek, (Fri Jan 25, 6:11 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Eric W. Biederman, (Thu Jan 24, 10:16 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 10:25 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Rafael J. Wysocki, (Thu Jan 24, 8:46 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 9:08 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 7:44 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 7:51 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 8:02 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 8:11 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 8:15 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Thu Jan 24, 8:31 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Thu Jan 24, 8:37 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Eric W. Biederman, (Thu Jan 24, 10:56 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Jeremy Fitzhardinge, (Fri Jan 25, 12:41 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Eric W. Biederman, (Fri Jan 25, 7:07 am)

[PATCH] x86: make nx_enabled conditional on CONFIG_X86_PAE, Harvey Harrison, (Tue Jan 22, 5:00 pm)

Re: [PATCH] x86: make nx_enabled conditional on CONFIG_X86_PAE, Harvey Harrison, (Tue Jan 22, 5:07 pm)

Re: [PATCH] x86: make nx_enabled conditional on CONFIG_X86_PAE, Ingo Molnar, (Tue Jan 22, 5:04 pm)

Re: [PATCH] x86: make nx_enabled conditional on CONFIG_X86_PAE, Harvey Harrison, (Tue Jan 22, 5:35 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Tue Jan 22, 4:52 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Tue Jan 22, 5:00 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Tue Jan 22, 6:21 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Tue Jan 22, 4:43 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Tue Jan 22, 4:45 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Andi Kleen, (Sat Jan 19, 7:07 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ian Campbell, (Sun Jan 20, 12:44 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Andi Kleen, (Sun Jan 20, 1:39 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Sun Jan 20, 2:48 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Ingo Molnar, (Tue Jan 22, 6:05 am)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Tue Jan 22, 12:23 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., Andi Kleen, (Sun Jan 20, 2:55 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Sun Jan 20, 2:54 pm)

Re: [PATCH] x86: Construct 32 bit boot time page tables in n..., H. Peter Anvin, (Sat Jan 19, 7:50 pm)

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