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SubjectRe: [PATCH] x86: Allow MMCONFIG above 4GB on x86_64

* John Keller <jpk@sgi.com> wrote:

> SGI UV will have MMCFG base addresses that are greater than 4GB (32
> bits).

> +++ linux-2.6/arch/x86/kernel/acpi/boot.c 2008-07-09 15:25:32.000000000 -0500
> @@ -200,6 +200,7 @@ int __init acpi_parse_mcfg(struct acpi_t
> }
>
> memcpy(pci_mmcfg_config, &mcfg[1], config_size);
> +#ifndef CONFIG_X86_64
> for (i = 0; i < pci_mmcfg_config_num; ++i) {
> if (pci_mmcfg_config[i].address > 0xFFFFFFFF) {
> printk(KERN_ERR PREFIX
> @@ -209,6 +210,7 @@ int __init acpi_parse_mcfg(struct acpi_t
> return -ENODEV;
> }
> }
> +#endif

hm. If then it should be enabled very carefully and initially probably
on a per system (i.e. DMI driven whitelist) basis.

Ingo


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