Messages in this thread | | | Date | Thu, 24 Jan 2008 23:43:07 -0800 | From | Jeremy Fitzhardinge <> | Subject | Re: [PATCH] x86: trim ram need to check if mtrr is there v2 |
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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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