Re: [PATCH 1/2] boot: ignore early NMIs
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- Subject: Re: [PATCH 1/2] boot: ignore early NMIs
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Mon, 12 Mar 2012 13:04:59 -0700
- Cc: Fernando Luis Vázquez Cao <fernando@xxxxxxxxxxxxx>, Don Zickus <dzickus@xxxxxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxx, Yinghai Lu <yinghai@xxxxxxxxxx>, akpm@xxxxxxxxxxxxxxxxxxxx, vgoyal@xxxxxxxxxx
- In-reply-to: <m1zkblmvw7.fsf@fess.ebiederm.org>
- User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.1) Gecko/20120209 Thunderbird/10.0.1
On 03/12/2012 01:01 PM, Eric W. Biederman wrote:
>
> The basic problem is which source do we block this at? How many
> sources are their? And architecturally last I looked x86 no longer
> has a NMI disable EFI and similar systems want to get away without
> a CMOS legacy clock because designers so often get them wrong.
>
On all processors which have an LAPIC you can block all NMI sources at
the LAPIC. I think it's safe to assume that if you don't have an LAPIC
-- an ancient system by now -- you have port 70h.
-hpa
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