linux-kernel - Re: [RFC v2-fix 1/1] x86/traps: Add #VE support for TDX guest

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Date:   Tue, 18 May 2021 09:00:36 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Tony Luck <tony.luck@...el.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,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC v2-fix 1/1] x86/traps: Add #VE support for TDX guest


> No APIC access either?


It's all X2APIC inside TDX which uses MSRs

>
> Also, shouldn't we have at least a:
>
> 	WARN_ON_ONCE(in_nmi());
>
> if we don't expect (or handle well) #VE in NMIs?

We handle it perfectly fine. It's just not needed.


-Andi