linux-kernel - Re: [RFC v1 13/26] x86/tdx: Handle MWAIT, MONITOR and WBINVD

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Message-ID: <CALCETrWQm+4ocEjDM2e1z=ewmjf4r--6UeqnTwKEtKRa_o-mNg@mail.gmail.com>
Date:   Fri, 5 Feb 2021 15:43:20 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v1 13/26] x86/tdx: Handle MWAIT, MONITOR and WBINVD

On Fri, Feb 5, 2021 at 3:39 PM Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>
> In non-root TDX guest mode, MWAIT, MONITOR and WBINVD instructions
> are not supported. So handle #VE due to these instructions as no ops.
>

MWAIT turning into NOP is no good.  How about suppressing
X86_FEATURE_MWAIT instead?

--Andy