linux-kernel - Re: [PATCH v6 04/11] x86/tdx: Add protected guest support for TDX guest

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Message-ID: <YVMWNhSUc8nNpBn/@zn.tnic>
Date:   Tue, 28 Sep 2021 15:18:46 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Joerg Roedel <joro@...tes.org>
Cc:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 04/11] x86/tdx: Add protected guest support for TDX
 guest

On Tue, Sep 28, 2021 at 03:04:36PM +0200, Joerg Roedel wrote:
> Yes, but distributions will enable this in their default configs, so the
> function call will happen on every Intel machine, even on bare-metal.

The result of whether the guest is a TDX needs to be cached and queried
instead anyway:

https://lkml.kernel.org/r/YVL4ZUGhfsh1QfRX@zn.tnic

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette