linux-kernel - Re: [PATCH 39/62] x86/sev-es: Harden runtime #VC handler for exceptions from user-space

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Message-ID: <CALCETrXnFr47OEDk8OYrHHW=1XNAQMUB=wPevhLM6ROnO6_Rog@mail.gmail.com>
Date:   Tue, 11 Feb 2020 14:47:05 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Joerg Roedel <joro@...tes.org>
Cc:     X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 39/62] x86/sev-es: Harden runtime #VC handler for
 exceptions from user-space

On Tue, Feb 11, 2020 at 5:53 AM Joerg Roedel <joro@...tes.org> wrote:
>
> From: Joerg Roedel <jroedel@...e.de>
>
> Send SIGBUS to the user-space process that caused the #VC exception
> instead of killing the machine. Also ratelimit the error messages so
> that user-space can't flood the kernel log.

What would cause this?  CPUID?  Something else?

--Andy