From: "H. Peter Anvin" <hpa@zytor.com>
To: "Roedel, Joerg" <Joerg.Roedel@amd.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@kernel.org" <stable@kernel.org>
Subject: Re: [PATCH 4/4] x86, gart: Make sure GART does not map physmem above 1TB
Date: Mon, 18 Apr 2011 08:53:20 -0700 [thread overview]
Message-ID: <4DAC5E70.6040204@zytor.com> (raw)
In-Reply-To: <20110418145230.GH2192@amd.com>
On 04/18/2011 07:52 AM, Roedel, Joerg wrote:
>>
>> Where does this limit come from?
>
> From the hardware. A GART PTE is only 32 bits in size so that it cannot
> be expanded. The physical address bits 32-39 are mapped 11:4 in the PTE.
> This can not be architecturally expanded to more than 40 physical bits.
>
AFAIK the GART format is implementation-specific (unless some standard
crept up when I wasn't looking -- this happens from time to time); this
file seems, despite its generic name, to be AMD K8 specific.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2011-04-18 15:53 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-18 13:45 [PATCH 0/4] gart cleanups and fixes Joerg Roedel
2011-04-18 13:45 ` [PATCH 1/4] x86, gart: Don't enforce GART aperture lower-bound by alignment Joerg Roedel
2011-04-18 14:45 ` H. Peter Anvin
2011-04-18 14:56 ` Roedel, Joerg
2011-04-18 15:51 ` H. Peter Anvin
2011-04-18 17:36 ` Joerg Roedel
2011-04-18 17:39 ` H. Peter Anvin
2011-04-18 17:50 ` Joerg Roedel
2011-04-18 19:06 ` Joerg Roedel
2011-04-18 19:40 ` H. Peter Anvin
2011-04-18 18:29 ` Yinghai Lu
2011-04-18 18:39 ` [tip:x86/gart] " tip-bot for Joerg Roedel
2011-04-18 13:45 ` [PATCH 2/4] x86, gart: Convert spaces to tabs in enable_gart_translation Joerg Roedel
2011-04-18 16:39 ` [tip:x86/urgent] " tip-bot for Joerg Roedel
2011-04-18 13:45 ` [PATCH 3/4] x86, gart: Set DISTLBWALKPRB bit always Joerg Roedel
2011-04-18 16:40 ` [tip:x86/urgent] " tip-bot for Joerg Roedel
2011-04-18 13:45 ` [PATCH 4/4] x86, gart: Make sure GART does not map physmem above 1TB Joerg Roedel
2011-04-18 14:46 ` H. Peter Anvin
2011-04-18 14:52 ` Roedel, Joerg
2011-04-18 15:53 ` H. Peter Anvin [this message]
2011-04-18 14:54 ` H. Peter Anvin
2011-04-18 14:59 ` Roedel, Joerg
2011-04-18 15:50 ` Ingo Molnar
2011-04-19 6:12 ` Roedel, Joerg
2011-04-19 7:25 ` Ingo Molnar
2011-04-19 9:15 ` [PATCH] x86, gart: Rename pci-gart_64.c to amd64_gart.c Roedel, Joerg
2011-04-19 13:43 ` [PATCH 4/4] x86, gart: Make sure GART does not map physmem above 1TB H. Peter Anvin
2011-04-19 14:29 ` Roedel, Joerg
2011-04-20 17:38 ` H. Peter Anvin
2011-05-10 15:32 ` [PATCH] x86, gart: Rename pci-gart_64.c to amd_gart_64.c 1TB Roedel, Joerg
2011-04-18 16:40 ` [tip:x86/urgent] x86, gart: Make sure GART does not map physmem above 1TB tip-bot for Joerg Roedel
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