Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU
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- Subject: Re: [tip:x86/microcode] x86/microcode_intel_early.c: Early update ucode on Intel's CPU
- From: Borislav Petkov <bp@xxxxxxxxx>
- Date: Wed, 19 Dec 2012 23:51:55 +0100
- Cc: Jacob Shin <jacob.shin@xxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>, "Yu, Fenghua" <fenghua.yu@xxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
- In-reply-to: <50D23EE8.7030904@zytor.com>
- Mail-followup-to: Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Jacob Shin <jacob.shin@xxxxxxx>, Yinghai Lu <yinghai@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx>, "Yu, Fenghua" <fenghua.yu@xxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
- User-agent: Mutt/1.5.21 (2010-09-15)
On Wed, Dec 19, 2012 at 02:25:44PM -0800, H. Peter Anvin wrote:
> The real question is what we can do to mitigate the damage.
Let's try the first thing that comes to mind: waste a variable MTRR on
it:
[ 0.000000] MTRR variable ranges enabled:
[ 0.000000] 0 base 000000000000 mask FFFF80000000 write-back
[ 0.000000] 1 base 000080000000 mask FFFFC0000000 write-back
[ 0.000000] 2 base 0000C0000000 mask FFFFF0000000 write-back
[ 0.000000] 3 base 000100000000 mask FFFF00000000 write-back
[ 0.000000] 4 base 000200000000 mask FFFFE0000000 write-back
[ 0.000000] 5 base 000220000000 mask FFFFF0000000 write-back
[ 0.000000] 6 disabled
[ 0.000000] 7 disabled
one of those last two. This is a small box though so I'm guessing on 1T
boxes those last two won't be disabled. Jacob?
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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