Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

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To: Eric W. Biederman <ebiederm@...>

Cc: H. Peter Anvin <hpa@...>, lkml <linux-kernel@...>, Chris Wright <chrisw@...>, <virtualization@...>, Chuck Ebbert <cebbert@...>, Andrew Morton <akpm@...>, Linus Torvalds <torvalds@...>

Subject: Re: [PATCH 10/28] i386: map enough initial memory to create lowmem mappings

Date: Monday, April 23, 2007 - 2:06 pm

Eric W. Biederman wrote:
quoted text> Consider a memory hole of size 8M immediately after our bootmem bitmap.
> head.S which knows nothing of holes will map the pages of the hole
> into the initial page tables assuming that is where the page tables
> will live.
>   

Sure, but considering we're only talking about mapping an additional *2*
pages, the chances are that it will affect a kernel as much as the early
head.S mapping.  It's well within the variability of fairly similar
kernel configs.

quoted text> As for how to fix this, we need to call boot_ioremap or better
> bt_ioremap on the address returned from alloc_bootmem_pages_low to
> force the allocated page into the page table.  After we have setup
> the page table page we can call unmap the page to free up the scarce
> early mapping resource.
>   

Would that be necessary?  Is there any need to remap it?  Couldn't you
just do the straightforward phys->virt mapping and use the page where it
lies?

    J
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Messages in current thread:

[PATCH 10/28] i386: map enough initial memory to create lowm..., Jeremy Fitzhardinge, (Sat Apr 14, 4:42 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chuck Ebbert, (Thu Apr 19, 4:47 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Thu Apr 19, 4:50 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Thu Apr 19, 4:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Thu Apr 19, 5:04 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Thu Apr 19, 5:11 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chuck Ebbert, (Thu Apr 19, 5:22 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Thu Apr 19, 5:35 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 5:12 am)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 12:34 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 12:42 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:21 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 2:06 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 2:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 3:10 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 3:14 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 3:21 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 3:39 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 4:41 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Mon Apr 23, 1:02 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:31 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 1:45 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 1:52 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andi Kleen, (Mon Apr 23, 1:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 1:22 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Mon Apr 23, 2:00 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Mon Apr 23, 12:01 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 4:54 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 5:31 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 6:00 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 6:06 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Sun Apr 29, 12:44 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Sun Apr 29, 12:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 6:18 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 6:52 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Eric W. Biederman, (Wed Apr 25, 7:33 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 7:41 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Chris Wright, (Wed Apr 25, 8:33 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jeremy Fitzhardinge, (Wed Apr 25, 8:55 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., H. Peter Anvin, (Sat Apr 14, 6:04 pm)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Jan Engelhardt, (Sun Apr 15, 5:46 am)

Re: [PATCH 10/28] i386: map enough initial memory to create ..., Andreas Schwab, (Sun Apr 15, 6:17 am)

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