linux-kernel - Re: [PATCH] x86: Allow MMCONFIG above 4GB on x86

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Message-ID: <20080718123858.GR6875@elte.hu>
Date:	Fri, 18 Jul 2008 14:38:58 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	John Keller <jpk@....com>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	takayoshi.kochi@...il.com, Yinghai Lu <yhlu.kernel@...il.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] x86: Allow MMCONFIG above 4GB on x86_64


* John Keller <jpk@....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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