Re: x86.git: mtrr trimming removes all memory under kvm

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

Cc: Jeremy Fitzhardinge <jeremy@...>, Ingo Molnar <mingo@...>, Linux Kernel Mailing List <linux-kernel@...>

Subject: Re: x86.git: mtrr trimming removes all memory under kvm

Date: Thursday, January 24, 2008 - 10:21 pm

On Thursday 24 January 2008 05:49:00 pm H. Peter Anvin wrote:
quoted text> Jeremy Fitzhardinge wrote:
> > When booting a current x86.git kernel under kvm, I get this:
> > 
> > (qemu) Linux version 2.6.24-rc8 (jeremy@ezr) (gcc version 4.1.2 20070925 
> > (Red Hat 4.1.2-33)) #1928 SMP PREEMPT Thu Jan 24 17:09:04 PST 2008
> > early_ioremap_init()
> > BIOS-provided physical RAM map:
> > BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> > BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> > BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
> > BIOS-e820: 0000000000100000 - 000000001fff0000 (usable)
> > BIOS-e820: 000000001fff0000 - 0000000020000000 (ACPI data)
> > BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved)
> > console [earlyser0] enabled
> > 0MB HIGHMEM available.
> > 511MB LOWMEM available.
> > Scan SMP from c0000000 for 1024 bytes.
> > Scan SMP from c009fc00 for 1024 bytes.
> > Scan SMP from c00f0000 for 65536 bytes.
> > Scan SMP from c009fc00 for 1024 bytes.
> > ***************
> > **** WARNING: likely BIOS bug
> > **** MTRRs don't cover all of memory, trimmed 131056 pages
> > ***************
> 
> Looks like the code doesn't check that the CPU *has* MTRRs...
> 

on 32 bit, max_pfn is supposed to be 0?

will look at it.

YH

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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)


linux-kernel:

Greg Kroah-Hartman	[PATCH 004/196] Chinese: add translation of SubmittingPatches
David Newall	Re: Slow DOWN, please!!!
Andrew Morton	Re: Linux 2.6.21-rc4
git:

linux-netdev:
David Miller	[GIT]: Networking
Gerrit Renker	[PATCH 27/37] dccp: Integration of dynamic feature activation - part 2 (server side)
Jarek Poplawski	Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().
Dale Farnsworth	Re: [PATCH 01/39] mv643xx_eth: reverse topological sort of functions
openbsd-misc: