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: Thu, 20 Dec 2012 00:55:38 +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: <50D252B6.6050802@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 03:50:14PM -0800, H. Peter Anvin wrote:
> We are trying to discuss mitigation strategies with you, but you
> haven't really given us any useful information, e.g. what happens near
> the various boundaries of the hole, what could trigger prefeching into
> the range, and what it would take to fix the BIOSes.
Another thing we could do (I admit it is ugly) is to add a quirk to the
#MC handler and detect that specific condition by looking at the address
reported in MCi_ADDR and exit early by not panicking the system.
Again, this is ugly but a possibility, still.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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