From: "H. Peter Anvin" <hpa@linux.intel.com>
To: Jacob Shin <jacob.shin@amd.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, Borislav Petkov <bp@alien8.de>,
Yinghai Lu <yinghai@kernel.org>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
"mingo@kernel.org" <mingo@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"linux-tip-commits@vger.kernel.org"
<linux-tip-commits@vger.kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU
Date: Wed, 19 Dec 2012 15:23:47 -0800 [thread overview]
Message-ID: <50D24C83.3080906@linux.intel.com> (raw)
In-Reply-To: <20121219225505.GA2968@jshin-Toonie>
On 12/19/2012 02:55 PM, Jacob Shin wrote:
>
> Well, really the problem is with any memory hole above 4GB that is too
> big to be covered by variable range MTRRs as UC. Because the kernel
> use to just simply do init_memory_mapping for 4GB ~ top of memory,
> any memory hole above 4GB are marked as WB in PATs.
>
> How is this handled in Intel architecture? If there are memory holes
> that are too big to be covered by variable range MTRRs as UC, are
> there other MTRR like CPU registers that the BIOS programs?
>
Intel CPUs don't have the TOM augmentation to the MTRR mechanism, and so
MTRRs need to explicitly enable caching of memory rather than the other
way around.
-hpa
next prev parent reply other threads:[~2012-12-19 23:23 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-30 1:47 [PATCH v2 00/11] x86/microcode: Early load microcode Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 01/10] Documentation/x86: " Fenghua Yu
2012-11-30 19:46 ` H. Peter Anvin
2012-11-30 20:40 ` Yu, Fenghua
2012-11-30 1:47 ` [PATCH v2 02/10] x86/microcode_intel.h: Define functions and macros for early loading ucode Fenghua Yu
2012-12-01 0:21 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 03/10] x86/microcode_core_early.c: Define interfaces " Fenghua Yu
2012-12-01 0:23 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 04/10] x86/microcode_intel_lib.c: Early update ucode on Intel's CPU Fenghua Yu
2012-12-01 0:24 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 05/10] x86/microcode_intel_early.c: " Fenghua Yu
2012-12-01 0:25 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-12-01 0:55 ` Yinghai Lu
2012-12-04 0:18 ` Yu, Fenghua
2012-12-11 2:39 ` Yinghai Lu
2012-12-11 3:41 ` H. Peter Anvin
2012-12-11 3:55 ` Yinghai Lu
2012-12-11 6:34 ` H. Peter Anvin
2012-12-11 7:07 ` Yinghai Lu
2012-12-11 14:57 ` Borislav Petkov
2012-12-11 16:46 ` Yinghai Lu
2012-12-11 16:48 ` H. Peter Anvin
2012-12-11 17:00 ` Yinghai Lu
2012-12-11 17:06 ` Borislav Petkov
2012-12-11 17:15 ` Yinghai Lu
2012-12-11 17:26 ` Yu, Fenghua
2012-12-11 17:38 ` H. Peter Anvin
2012-12-11 23:53 ` Yinghai Lu
2012-12-11 23:57 ` H. Peter Anvin
2012-12-12 0:27 ` Yinghai Lu
2012-12-12 0:37 ` H. Peter Anvin
2012-12-12 7:14 ` Yinghai Lu
2012-12-12 10:26 ` Yinghai Lu
2012-12-13 1:06 ` Yinghai Lu
2012-12-12 6:57 ` H. Peter Anvin
2012-12-12 13:38 ` Borislav Petkov
2012-12-12 17:43 ` H. Peter Anvin
2012-12-13 5:12 ` H. Peter Anvin
2012-12-13 5:26 ` H. Peter Anvin
2012-12-13 7:01 ` Yinghai Lu
2012-12-13 15:01 ` H. Peter Anvin
2012-12-13 19:13 ` Borislav Petkov
2012-12-13 21:36 ` H. Peter Anvin
2012-12-14 9:11 ` Yinghai Lu
2012-12-14 18:16 ` H. Peter Anvin
2012-12-14 19:46 ` H. Peter Anvin
2012-12-14 20:04 ` Yinghai Lu
2012-12-14 20:08 ` Yinghai Lu
2012-12-14 20:14 ` Yinghai Lu
2012-12-14 20:44 ` H. Peter Anvin
2012-12-15 7:57 ` Yinghai Lu
2012-12-15 19:30 ` H. Peter Anvin
2012-12-15 20:55 ` Yinghai Lu
2012-12-15 21:31 ` H. Peter Anvin
2012-12-15 21:40 ` H. Peter Anvin
2012-12-15 22:13 ` Yinghai Lu
2012-12-15 22:17 ` H. Peter Anvin
2012-12-15 23:15 ` Yinghai Lu
2012-12-15 23:17 ` H. Peter Anvin
2012-12-19 20:37 ` Borislav Petkov
2012-12-19 21:07 ` Jacob Shin
2012-12-19 21:48 ` H. Peter Anvin
2012-12-19 22:05 ` Jacob Shin
2012-12-19 22:25 ` H. Peter Anvin
2012-12-19 22:47 ` Yinghai Lu
2012-12-19 22:59 ` H. Peter Anvin
2012-12-19 22:51 ` Borislav Petkov
2012-12-19 22:59 ` Jacob Shin
2012-12-19 23:03 ` Borislav Petkov
2012-12-19 23:21 ` Jacob Shin
2012-12-19 23:56 ` H. Peter Anvin
2012-12-19 23:22 ` H. Peter Anvin
2012-12-19 23:40 ` Borislav Petkov
2012-12-20 0:02 ` H. Peter Anvin
2012-12-20 0:10 ` Borislav Petkov
2012-12-20 0:15 ` H. Peter Anvin
2012-12-19 23:40 ` Yinghai Lu
2012-12-19 23:43 ` H. Peter Anvin
2012-12-19 23:48 ` Yinghai Lu
2012-12-19 23:40 ` Jacob Shin
2012-12-19 23:45 ` Yinghai Lu
2012-12-19 23:50 ` H. Peter Anvin
2012-12-19 23:55 ` Borislav Petkov
2012-12-19 23:57 ` H. Peter Anvin
2012-12-20 0:07 ` Jacob Shin
2012-12-20 0:24 ` H. Peter Anvin
2012-12-20 0:29 ` Jacob Shin
2012-12-20 0:41 ` H. Peter Anvin
2012-12-20 2:37 ` H. Peter Anvin
2012-12-20 4:16 ` Jacob Shin
2012-12-20 4:21 ` H. Peter Anvin
2012-12-19 22:55 ` Jacob Shin
2012-12-19 23:00 ` Borislav Petkov
2012-12-19 23:17 ` H. Peter Anvin
2012-12-19 23:30 ` Borislav Petkov
2012-12-19 23:37 ` H. Peter Anvin
2012-12-19 23:23 ` H. Peter Anvin [this message]
2012-12-16 2:09 ` Yinghai Lu
2012-12-16 5:17 ` Yinghai Lu
2012-12-16 8:50 ` Yinghai Lu
2012-12-17 22:47 ` Yinghai Lu
2012-12-17 23:11 ` H. Peter Anvin
2012-12-17 23:26 ` Yinghai Lu
2012-12-18 1:11 ` Yinghai Lu
2012-12-18 1:51 ` Yinghai Lu
2012-12-18 2:42 ` Yinghai Lu
2012-12-14 20:10 ` H. Peter Anvin
2012-12-14 20:17 ` Yinghai Lu
2012-12-14 20:52 ` H. Peter Anvin
2012-12-14 21:07 ` Yinghai Lu
2012-12-11 18:02 ` H. Peter Anvin
2012-12-11 18:20 ` H. Peter Anvin
2012-12-11 18:42 ` Yinghai Lu
2012-12-11 18:46 ` H. Peter Anvin
2012-12-11 19:18 ` Yinghai Lu
2012-12-11 19:33 ` H. Peter Anvin
2012-11-30 1:47 ` [PATCH v2 06/10] x86/head_32.S: Early update ucode in 32-bit Fenghua Yu
2012-12-01 0:26 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 07/10] x86/head64.c: Early update ucode in 64-bit Fenghua Yu
2012-12-01 0:27 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 08/10] x86/smpboot.c: Early update ucode on AP Fenghua Yu
2012-12-01 0:28 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 09/10] x86/mm/init.c: Copy ucode from initrd image to memory Fenghua Yu
2012-12-01 0:29 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
2012-11-30 1:47 ` [PATCH v2 10/10] x86/Kconfig: Configurations to enable/disable the feature Fenghua Yu
2012-12-01 0:30 ` [tip:x86/microcode] x86/Kconfig: Configurations to enable/ disable " tip-bot for Fenghua Yu
2012-12-21 7:44 [PATCH v5 08/12] x86/microcode_intel_early.c: Early update ucode on Intel's CPU Fenghua Yu
2013-01-31 22:33 ` [tip:x86/microcode] " tip-bot for Fenghua Yu
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