Re: [RFC] use realmode code to reserve end-of-conventional-memory to 1MB

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From: H. Peter Anvin

Subject: Re: [RFC] use realmode code to reserve end-of-conventional-memory to 1MB

Date: Thursday, February 28, 2008 - 2:14 pm

Ian Campbell wrote:
quoted text> On Thu, 2008-02-28 at 14:28 +0100, Alexander van Heukelum wrote:
>> Instead of using early reservations inside the kernel code,
>> we could use the realmode code to modify the e820 memmap.
>> This patch shows what that would look like. I have not looked
>> at the case where the BIOS does not provide an e820 memmap
>> yet. Probably a full solution would need to create a fake
>> e820 memmap in that case.
> 
> An e820 is already faked up in machine_specific_memory_setup() if one
> doesn't already exist.
> 
>> Comments?
> 
> This won't work for Xen since the real-mode code never runs there. I
> think it could be fixed in xen_memory_setup() though if native goes down
> this route.
> 

s/could/should/.

You need to set up your memory map more sensibly; it's not just the 
kernel, user space tries to access these areas too.

	-hpa
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Messages in current thread:

[PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 10:46 am)

Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Sun Feb 24, 12:27 pm)

Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Sun Feb 24, 12:41 pm)

Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Sun Feb 24, 1:53 pm)

Re: [PATCH] Fix alignment of early reservation for EBDA, H. Peter Anvin, (Sun Feb 24, 7:18 pm)

Re: [PATCH] Fix alignment of early reservation for EBDA, Alexander van Heukelum, (Mon Feb 25, 9:54 am)

Re: [PATCH] Fix alignment of early reservation for EBDA, Ingo Molnar, (Mon Feb 25, 10:01 am)

[PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 11:07 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 11:13 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Alexander van Heukelum, (Mon Feb 25, 12:46 pm)

Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, H. Peter Anvin, (Mon Feb 25, 2:17 pm)

Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Ingo Molnar, (Tue Feb 26, 2:30 am)

Re: [PATCH] Fix alignment of early reservation for EBDA, Andi Kleen, (Wed Feb 27, 7:25 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1MB, Andi Kleen, (Wed Feb 27, 7:26 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Andi Kleen, (Wed Feb 27, 7:38 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., H. Peter Anvin, (Wed Feb 27, 9:44 am)

Re: [PATCH] reserve_early end-of-conventional-memory to 1M ..., Alexander van Heukelum, (Wed Feb 27, 1:01 pm)

[PATCH] reserve end-of-conventional-memory to 1MB on 32-bit, Alexander van Heukelum, (Thu Feb 28, 6:13 am)

[RFC] use realmode code to reserve end-of-conventional-mem ..., Alexander van Heukelum, (Thu Feb 28, 6:28 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ian Campbell, (Thu Feb 28, 2:09 pm)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 2:12 pm)

Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Thu Feb 28, 2:14 pm)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Thu Feb 28, 4:16 pm)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 4:49 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 10:14 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:38 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Fri Feb 29, 11:44 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 11:56 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Fri Feb 29, 1:00 pm)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Fri Feb 29, 3:06 pm)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Fri Feb 29, 3:26 pm)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Sat Mar 1, 9:09 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 6 ..., Alexander van Heukelum, (Sat Mar 1, 9:12 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 4:41 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 4:44 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 6:31 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 7:33 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 7:49 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ian Campbell, (Tue Mar 4, 8:12 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:13 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Mark McLoughlin, (Tue Mar 4, 8:16 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 8:18 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Ingo Molnar, (Tue Mar 4, 8:24 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 8:25 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 9:02 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:15 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Mark McLoughlin, (Tue Mar 4, 9:15 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Ingo Molnar, (Tue Mar 4, 9:23 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Alexander van Heukelum, (Tue Mar 4, 9:51 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., H. Peter Anvin, (Tue Mar 4, 10:05 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB on 3 ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:11 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Tue Mar 4, 10:44 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB, 32- ..., Alexander van Heukelum, (Tue Mar 4, 11:57 am)

Re: [PATCH] reserve end-of-conventional-memory to 1MB, 64- ..., Alexander van Heukelum, (Tue Mar 4, 12:12 pm)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 8:59 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 9:08 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 9:38 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Eduardo Habkost, (Wed Mar 5, 9:53 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:27 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., Jeremy Fitzhardinge, (Wed Mar 5, 10:28 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:28 am)

Re: [RFC] use realmode code to reserve end-of-conventional ..., H. Peter Anvin, (Wed Mar 5, 10:38 am)

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