linux-kernel - Re: [PATCH v3 59/75] x86/sev-es: Handle MONITOR/MONITORX Events

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Date:   Fri, 12 Jun 2020 11:25:49 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        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>,
        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>,
        Joerg Roedel <jroedel@...e.de>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v3 59/75] x86/sev-es: Handle MONITOR/MONITORX Events

On Thu, Jun 11, 2020 at 02:33:12PM -0500, Tom Lendacky wrote:
> I don't think there is any guarantee that MONITOR/MWAIT would work within a
> guest (I'd have to dig some more on that to get a definitive answer, but
> probably not necessary to do). As you say, if KVM emulates it as a NOP,
> there's no sense in exposing the GPA - make it a NOP in the handler. I just
> need to poke some other hypervisor vendors and hear what they have to say.

Okay, makes sense. I made monitor/mwait nops in the patch-set.

Regards,

	Joerg