linux-kernel - Re: [PATCH 70/70] x86/sev-es: Add NMI state tracking

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Date:   Thu, 19 Mar 2020 20:41:31 +0100
From:   Joerg Roedel <jroedel@...e.de>
To:     Mika Penttilä <mika.penttila@...tfour.com>
Cc:     Joerg Roedel <joro@...tes.org>, x86@...nel.org, 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>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 70/70] x86/sev-es: Add NMI state tracking

On Thu, Mar 19, 2020 at 06:53:29PM +0200, Mika Penttilä wrote:
> > +SYM_CODE_START(sev_es_iret_user)
> 
> 
> What makes kernel jump here? Can't see this referenced from anywhere?

Sorry, it is just a left-over from a previous version of this patch
(which implemented the single-step-over-iret). This label is not used
anymore. The jump to it was in
swapgs_restore_regs_and_return_to_usermode, after checking the
sev_es_in_nmi flag.

Regards,

	Joerg