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: Wednesday, March 5, 2008 - 9:08 am

Eduardo Habkost wrote:
quoted text>>
>> diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
>> index 3bad477..2341492 100644
>> --- a/arch/x86/xen/setup.c
>> +++ b/arch/x86/xen/setup.c
>> @@ -38,7 +38,8 @@ char * __init xen_memory_setup(void)
>>  	unsigned long max_pfn = xen_start_info->nr_pages;
>>  
>>  	e820.nr_map = 0;
>> -	add_memory_region(0, PFN_PHYS(max_pfn), E820_RAM);
>> +	add_memory_region(0, LOWMEMSIZE(), E820_RAM);
>> +	add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
> 
> Won't this waste 300+ KB of Perfectly Good RAM? Or I understood it
> incorrectly?
> 
> I am aware that it would take more work to tell all kernel code that it
> shouldn't look for BIOS data on this region when running as a domU guest,
> but it seems that it would be a better solution.
> 

No, the right thing is for Xen to not try to map RAM in this area.

	-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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