linux-kernel - Re: [PATCH v3 1/1] x86/tdx: Handle MWAIT, MONITOR and WBINVD

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Message-ID: <10834a17-cae4-d0e3-c82b-f69da7f9141a@linux.intel.com>
Date:   Mon, 29 Mar 2021 16:37:18 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Andy Lutomirski <luto@...capital.net>
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>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] x86/tdx: Handle MWAIT, MONITOR and WBINVD



On 3/29/21 4:23 PM, Andy Lutomirski wrote:
> 
>> On Mar 29, 2021, at 4:17 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
>> appropriately.
> 
> Is there something I missed elsewhere in the code that checks CPL?
We don't check for CPL explicitly. But if we are reaching here, then we
executing these instructions with wrong CPL.
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer