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

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Date:	Fri, 18 Jul 2008 08:02:48 -0500 (CDT)
From:	John Keller <jpk@....com>
To:	mingo@...e.hu (Ingo Molnar)
Cc:	jpk@....com (John Keller), linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, takayoshi.kochi@...il.com,
	yhlu.kernel@...il.com (Yinghai Lu),
	jbarnes@...tuousgeek.org (Jesse Barnes)
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

I've also posted a revised patch that is platform specific.

http://marc.info/?l=linux-acpi&m=121615159014404&w=2

John
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