From: "H. Peter Anvin" <hpa@zytor.com>
To: Jacob Shin <jacob.shin@amd.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, x86@kernel.org,
Yinghai Lu <yinghai@kernel.org>
Subject: Re: [PATCH 1/1] x86, e820: Remove direct mapping of reserved space for HT hole around 1TB
Date: Tue, 11 Oct 2011 16:44:39 -0700 [thread overview]
Message-ID: <4E94D4E7.5010001@zytor.com> (raw)
In-Reply-To: <1318370975-10817-1-git-send-email-jacob.shin@amd.com>
On 10/11/2011 03:09 PM, Jacob Shin wrote:
> The entire HT hole and also the unused address range before that hole
> need to be excluded from direct mapping. Otherwise speculative
> accesses to that reserved region can happen which cause machine
> checks.
BARF!
This is completely insane ad hockery when all that really should need to
happen is marking the HT region RESERVED, which should be possible on
any HT-equipped processor.
-hpa
next prev parent reply other threads:[~2011-10-11 23:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-11 22:09 [PATCH 1/1] x86, e820: Remove direct mapping of reserved space for HT hole around 1TB Jacob Shin
2011-10-11 23:44 ` H. Peter Anvin [this message]
2011-10-13 9:57 ` Andreas Herrmann
2011-10-13 15:52 ` H. Peter Anvin
2011-10-13 11:04 ` Andreas Herrmann
2011-10-14 5:45 ` Yinghai Lu
2012-10-16 16:47 ` Shuah Khan
[not found] <6ec48b96-afab-4c8b-ab74-2c640c2a161b@blur>
[not found] ` <8630fe28-0c1c-4f3a-90e1-df2d1b6615a6@blur>
2012-10-16 17:48 ` Shuah Khan
2012-10-16 18:26 ` Jacob Shin
2012-10-16 19:02 ` H. Peter Anvin
2012-10-17 15:30 ` Shuah Khan
2012-10-17 18:25 ` H. Peter Anvin
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