linux-kernel - Re: [RFC v2 16/32] x86/tdx: Handle MWAIT, MONITOR and WBINVD

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Message-ID: <01b0e007-6af6-ca2e-2a0d-7ff4ca2a2927@linux.intel.com>
Date:   Tue, 11 May 2021 08:52:42 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2 16/32] x86/tdx: Handle MWAIT, MONITOR and WBINVD


> The 'default' case in this 'switch' prints the exit reason and faults,
> can't that also trigger a backtrace that dumps the exception stack and
> the faulting instruction? In other words shouldn't this just fail with
> a common way to provide better debug on any unhandled #VE and not try
> to continue running past something that "can't" happen?

It will use the #GP common code which will do all the backtracing etc.

We didn't think we would need anything else than what #GP already does.

-Andi