Re: [Xen-devel] [PATCH] x86-64: one more adjustment for Fam10 MMCONF enabling

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Thanks for the info !, it's quite unfortunate most things eventually end at the 
bios.

--
Sander

Wednesday, November 24, 2010, 9:30:51 AM, you wrote:

>>>> On 23.11.10 at 22:37, Sander Eikelenboom <linux@xxxxxxxxxxxxxx> wrote:
>> Is there anything i have to configure for the "Fam10 MMCONF" to be enabled ?
>> From what i see from my "xm dmesg" it's not enabled, although it's a family 
>> 10h cpu (phenom x6)
>> 
>> (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
>> (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
>> (XEN) ACPI: IRQ0 used by override.
>> (XEN) ACPI: IRQ2 used by override.
>> (XEN) ACPI: IRQ9 used by override.
>> (XEN) Enabling APIC mode:  Flat.  Using 2 I/O APICs
>> (XEN) ACPI: HPET id: 0x8300 base: 0xfed00000
>> (XEN) PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
>> (XEN) PCI: Not using MMCONFIG.

> Your BIOS apparently sets up MCFG (including a valid ACPI table)
> but fails to reserve the range in the E820 table, which is taken as
> a strong indication to not use it. For Linux, it's being debated
> whether the command line override ("mmcfg=amd-fam10" in the
> Xen case) should force a reserved region into the E820 table (so
> that the later check succeeds). I'm intending to submit a
> corresponding Xen patch if on the Linux side the decision is
> taken to do so (albeit I'm not fully convinced that this is the
> right thing to do, I agree to the point being made that this
> would normally only be done when the command line option
> was explicitly given - the exception being a DMI white listed set
> of systems).

> There's no other workaround I know of, since Xen (other than
> Linux) doesn't have a mechanism to force an E820 reserved
> region from the command line.

> Jan




-- 
Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel