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References: <cover.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com> <f443f4a2d80ea3717bd1865ae61cec2a100805c3.1612563142.git.sathyanarayanan.kuppuswamy@linux.intel.com>
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From:   Andy Lutomirski <luto@kernel.org>
Date:   Fri, 5 Feb 2021 15:43:20 -0800
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Subject: Re: [RFC v1 13/26] x86/tdx: Handle MWAIT, MONITOR and WBINVD
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Andy Lutomirski <luto@kernel.org>,
        Dave Hansen <dave.hansen@intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kirill Shutemov <kirill.shutemov@linux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Raj Ashok <ashok.raj@intel.com>,
        Sean Christopherson <seanjc@google.com>,
        LKML <linux-kernel@vger.kernel.org>
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On Fri, Feb 5, 2021 at 3:39 PM Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.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