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Open Source and information security mailing list archives
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Date: Wed, 20 Jun 2012 16:49:22 -0700 From: "H. Peter Anvin" <hpa@...or.com> To: Henrique de Moraes Holschuh <hmh@....eng.br> CC: Peter Zijlstra <peterz@...radead.org>, Borislav Petkov <bp@...64.org>, LKML <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>, Ingo Molnar <mingo@...nel.org>, Andreas Herrmann <andreas.herrmann3@....com>, Dimitri Sivanich <sivanich@....com>, Dmitry Adamushko <dmitry.adamushko@...il.com>, Greg Kroah-Hartman <greg@...ah.com>, "Yu, Fenghua" <fenghua.yu@...el.com> Subject: Re: [PATCH] x86, microcode: Make reload interface per system On 06/20/2012 04:46 PM, Henrique de Moraes Holschuh wrote: > > Well, it makes the kernel tell us what (amd/intel/whatever) firmware it > wants, and requires (after patching) a simple echo 1 >foo to activate. It > is also harmless if activated without updated firmware in place. > > /dev/cpu/microcode requires special software (or a dd with bs>=file size), > since it borks if userspace breaks a microcode into two write() syscalls, > and requires detection of the cpu vendor. Very annoying. > Yeah, because dd is such an exotic piece of software... -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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