Re: [PATCH] x86: trim ram need to check if mtrr is there v2

[Jeremy Fitzhardinge]

Yinghai Lu wrote:
> [PATCH] x86: trim ram need to check if mtrr is there v2
>
>   
> > > 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
> > > ***************
> > >       
> > H. Peter Anvin wrote:
> > Looks like the code doesn't check that the CPU *has* MTRRs...
> >     
>
> so check it mtrr is there, also check if mem less 4G and is AMD as early
>   

Thanks, this gets me to usermode under kvm.

   J
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