linux-kernel - Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support

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Date:   Mon, 31 Oct 2016 23:41:19 +0100
From:   Paul Bolle <pebolle@...cali.nl>
To:     Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Cc:     Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        Rusty Russell <rusty@...tcorp.com.au>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH 0/8] x86/fpu: Remove CR0.TS support

On Mon, 2016-10-31 at 15:18 -0700, Andy Lutomirski wrote:
> I havne't meaningfully tested lguest because I can't get it to work
> even without these patches.

Have you disabled CONFIG_OLPC in the .config for the guest kernel?
Otherwise you will run into
    lguest: Reinjecting trap 13 for fault at 0x1000062: Invalid argument

A similar obscure gotcha (I think it is "unhandled trap 13") can be
avoided by launching the guest with the dis_ucode_ldr kernel option.

Hope this helps,

Paul Bolle