From: Yinghai Lu <Yinghai.Lu@Sun.COM>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Ingo Molnar <mingo@elte.hu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: x86.git: mtrr trimming removes all memory under kvm
Date: Thu, 24 Jan 2008 18:21:40 -0800 [thread overview]
Message-ID: <200801241821.42243.yinghai.lu@sun.com> (raw)
In-Reply-To: <4799400C.1060102@zytor.com>
On Thursday 24 January 2008 05:49:00 pm H. Peter Anvin wrote:
> 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
next prev parent reply other threads:[~2008-01-25 2:05 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-25 1:44 x86.git: mtrr trimming removes all memory under kvm Jeremy Fitzhardinge
2008-01-25 1:49 ` H. Peter Anvin
2008-01-25 2:21 ` Yinghai Lu [this message]
2008-01-25 2:32 ` Yinghai Lu
2008-01-25 10:52 ` Andi Kleen
2008-01-25 3:47 ` [PATCH] x86: trim ram need to check if mtrr is there v2 Yinghai Lu
2008-01-25 5:44 ` H. Peter Anvin
2008-01-25 7:50 ` Yinghai Lu
2008-01-25 7:43 ` Jeremy Fitzhardinge
2008-01-25 8:13 ` Yinghai Lu
2008-01-25 8:39 ` Yinghai Lu
2008-01-25 11:12 ` Ingo Molnar
2008-01-25 15:47 ` H. Peter Anvin
2008-01-25 8:42 ` [PATCH] x86: trim ram need to check if mtrr is there v3 Yinghai Lu
2008-01-25 11:09 ` Ingo Molnar
2008-01-25 18:55 ` Jeremy Fitzhardinge
2008-01-25 18:59 ` Ingo Molnar
2008-01-25 19:01 ` Jeremy Fitzhardinge
2008-01-25 19:04 ` Ingo Molnar
2008-01-25 19:27 ` Jeremy Fitzhardinge
2008-01-25 19:30 ` Ingo Molnar
2008-01-25 19:32 ` Yinghai Lu
2008-01-25 19:39 ` Jeremy Fitzhardinge
2008-01-25 19:19 ` Yinghai Lu
2008-01-25 19:04 ` Jeremy Fitzhardinge
2008-01-25 18:59 ` Jeremy Fitzhardinge
2008-01-25 19:02 ` Ingo Molnar
2008-01-25 14:21 ` Ingo Molnar
2008-01-25 14:57 ` Andi Kleen
2008-01-25 15:10 ` Ingo Molnar
2008-01-25 15:57 ` H. Peter Anvin
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