linux-kernel - Re: [PATCH v4 45/75] x86/sev-es: Adjust #VC IST Stack on entering NMI handler

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Message-ID: <20200715105629.GK10769@hirez.programming.kicks-ass.net>
Date:   Wed, 15 Jul 2020 12:56:29 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Joerg Roedel <joro@...tes.org>, x86@...nel.org, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.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>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 45/75] x86/sev-es: Adjust #VC IST Stack on entering
 NMI handler

On Wed, Jul 15, 2020 at 12:26:53PM +0200, Joerg Roedel wrote:
> On Wed, Jul 15, 2020 at 11:47:02AM +0200, Peter Zijlstra wrote:

> > That's pretty disguisting :-(
> 
> Yeah, but its needed because ... IST :(
> I am open for suggestions on how to make it less disgusting. Or maybe
> you like it more if you think of it as a software implementation of what
> hardware should actually do to make IST less painful.

No bright ideas, sadly..