Re: [PATCH] x86: trim ram need to check if mtrr is there v3

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From: Jeremy Fitzhardinge <jeremy@...>

To: Yinghai Lu <Yinghai.Lu@...>

Cc: Ingo Molnar <mingo@...>, H. Peter Anvin <hpa@...>, Linux Kernel Mailing List <linux-kernel@...>

Subject: Re: [PATCH] x86: trim ram need to check if mtrr is there v3

Date: Friday, January 25, 2008 - 3:04 pm

Yinghai Lu wrote:
quoted text> On Friday 25 January 2008 10:55:31 am Jeremy Fitzhardinge wrote:
>   
>> Ingo Molnar wrote:
>>     
>>> * Yinghai Lu <Yinghai.Lu@Sun.COM> wrote:
>>>
>>>   
>>>       
>>>> [PATCH] x86: trim ram need to check if mtrr is there v3
>>>>     
>>>>         
>>>   
>>>       
>>>>> H. Peter Anvin wrote:
>>>>> Looks like the code doesn't check that the CPU *has* MTRRs...
>>>>>       
>>>>>           
>>>> so more strict check if mtrr is there really.
>>>> bail out if mtrr all blank when qemu cpu model is used
>>>>
>>>> and check if is AMD as early
>>>> also remove 4G less check, according to hpa.
>>>>     
>>>>         
>>> thanks, applied. Shouldnt we put in an exception for when there is MTRR 
>>> support, but they dont cover anything. Still emit a warning - but 
>>> booting up real slow is still better than losing all of RAM and crashing 
>>>   
>>>       
>> The problem is re-occuring for me with current x86.git.  Looks like v2 
>> did the trick, and v3 is broken...
>>     
>
> so the ram size less 4g is way out for your case.
>
> again, can you post /proc/mtrrs with v2 patch?
>   

It was empty.  But ignore this report; it wasn't against the right 
version of x86.git.

    J
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Messages in current thread:

x86.git: mtrr trimming removes all memory under kvm, Jeremy Fitzhardinge, (Thu Jan 24, 9:44 pm)

Re: x86.git: mtrr trimming removes all memory under kvm, H. Peter Anvin, (Thu Jan 24, 9:49 pm)

[PATCH] x86: trim ram need to check if mtrr is there v2, Yinghai Lu, (Thu Jan 24, 11:47 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, Jeremy Fitzhardinge, (Fri Jan 25, 3:43 am)

[PATCH] x86: trim ram need to check if mtrr is there v3, Yinghai Lu, (Fri Jan 25, 4:42 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 10:21 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Andi Kleen, (Fri Jan 25, 10:57 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 11:10 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, H. Peter Anvin, (Fri Jan 25, 11:57 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 7:09 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 2:59 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 3:02 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 2:55 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Yinghai Lu, (Fri Jan 25, 3:19 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 3:04 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 2:59 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 3:01 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 3:04 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 3:27 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Yinghai Lu, (Fri Jan 25, 3:32 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Jeremy Fitzhardinge, (Fri Jan 25, 3:39 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v3, Ingo Molnar, (Fri Jan 25, 3:30 pm)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, Yinghai Lu, (Fri Jan 25, 4:13 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, Ingo Molnar, (Fri Jan 25, 7:12 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, H. Peter Anvin, (Fri Jan 25, 11:47 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, Yinghai Lu, (Fri Jan 25, 4:39 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, H. Peter Anvin, (Fri Jan 25, 1:44 am)

Re: [PATCH] x86: trim ram need to check if mtrr is there v2, Yinghai Lu, (Fri Jan 25, 3:50 am)

Re: x86.git: mtrr trimming removes all memory under kvm, Yinghai Lu, (Thu Jan 24, 10:32 pm)

Re: x86.git: mtrr trimming removes all memory under kvm, Andi Kleen, (Fri Jan 25, 6:52 am)

Re: x86.git: mtrr trimming removes all memory under kvm, Yinghai Lu, (Thu Jan 24, 10:21 pm)

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