linux-kernel - Re: Geode LX boot fails after x86 microcode revision change

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Message-ID: <CAMLZHHTu-FNphvt5_L7fxqRpPukfs8nbS71x3GYo5GsPBo5cNw@mail.gmail.com>
Date:	Tue, 8 Nov 2011 16:17:21 -0600
From:	Daniel Drake <dsd@...top.org>
To:	"Petkov, Borislav" <Borislav.Petkov@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...64.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Geode LX boot fails after x86 microcode revision change

On Tue, Nov 8, 2011 at 4:13 PM, Petkov, Borislav
<Borislav.Petkov@....com> wrote:
> This could definitely explain why it hangs, the rdmsr_safe call is
>  in early_init_amd(), so it could really be too early for exception tables.

I think this is almost certainly the cause too. The symptoms of this
issue are exactly the same as the early boot hang once discussed in a
thread titled "Dynamic nop selection breaks boot on Geode LX" (which
you wrote to as well) which was a problem of running code before
having exception tables set up.

I haven't yet run your tests except for "rdmsr 0x8b" which returns
"pread: Input/output error" - let me know if you would still like
results from the other tests.

Thanks
Daniel
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