linux-kernel - Re: [PATCH 19/62] x86/sev-es: Add support for handling IOIO exceptions

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Message-ID: <20200212114949.GD20066@8bytes.org>
Date:   Wed, 12 Feb 2020 12:49:50 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        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 19/62] x86/sev-es: Add support for handling IOIO
 exceptions

On Tue, Feb 11, 2020 at 02:28:06PM -0800, Andy Lutomirski wrote:
> On Tue, Feb 11, 2020 at 5:53 AM Joerg Roedel <joro@...tes.org> wrote:
> It would be nice if this could reuse the existing in-kernel
> instruction decoder.  Is there some reason it can't?

It does, see patch 5, which makes the inat-tables generator script
suitable for pre-decompression boot code. Actually every
instruction-caused #VC exception will decode the instruction to get its
length.

Regards,

	Joerg