linux-kernel - Re: [RFC v2 08/32] x86/traps: Add #VE support for TDX guest

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Date:   Thu, 13 May 2021 13:07:35 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Tony Luck <tony.luck@...el.com>
Cc:     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@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC v2 08/32] x86/traps: Add #VE support for TDX guest

On 5/13/21 12:47 PM, Andi Kleen wrote:
> "if there is any reason for it to nest the TD would shut down."

The TDX EAS says:

> If, when attempting to inject a #VE, the Intel TDX module discovers
> that the guest TD has not yet retrieved the information for a
> previous #VE (i.e., VE_INFO.VALID is not 0), the TDX module injects a
> #DF into the guest TD to indicate a #VE overrun.

How does that result in a shut down?