linux-kernel - Re: [PATCH v3 20/21] x86/virt/tdx: Add kernel command line to opt-in TDX host support

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Date:   Thu, 28 Apr 2022 10:25:43 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Kai Huang <kai.huang@...el.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     seanjc@...gle.com, pbonzini@...hat.com, len.brown@...el.com,
        tony.luck@...el.com, rafael.j.wysocki@...el.com,
        reinette.chatre@...el.com, dan.j.williams@...el.com,
        peterz@...radead.org, ak@...ux.intel.com,
        kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        isaku.yamahata@...el.com
Subject: Re: [PATCH v3 20/21] x86/virt/tdx: Add kernel command line to opt-in
 TDX host support

On 4/5/22 21:49, Kai Huang wrote:
> Enabling TDX consumes additional memory (used by TDX as metadata) and
> additional initialization time.  Introduce a kernel command line to
> allow to opt-in TDX host kernel support when user truly wants to use
> TDX.

>From the cover letter:

	"This series doesn't initialize TDX at boot time"

Could you please square that circle for me?  How does a feature that
doesn't get initialized a boot time need a boot-time command line opt-in?