linux-kernel - Re: [PATCH v9 1/6] x86/tdx: Add TDX Guest attestation interface driver

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Date:   Tue, 30 Aug 2022 02:25:19 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "Hansen, Dave" <dave.hansen@...el.com>,
        "Wang, Wei W" <wei.w.wang@...el.com>, "bp@...en8.de" <bp@...en8.de>
CC:     "khalid.elmously@...onical.com" <khalid.elmously@...onical.com>,
        "tim.gardner@...onical.com" <tim.gardner@...onical.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Cox, Philip" <philip.cox@...onical.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "wander@...hat.com" <wander@...hat.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH v9 1/6] x86/tdx: Add TDX Guest attestation interface
 driver

On Mon, 2022-08-29 at 08:05 +0000, Wang, Wei W wrote:
> On Monday, August 29, 2022 11:15 AM, Huang, Kai wrote:
> > On Mon, 2022-08-22 at 14:44 -0700, Dave Hansen wrote:
> > > What ioctl()s are in the pipeline for the host side?  Are they all
> > > part of /dev/kvm, or are there any TDX-specific "drivers" for the host?
> > 
> > Sorry for late reply.  Was on vacation last week.
> > 
> > AFAICT no ioctl() is in the pipeline for the host side, except those belong to
> > /dev/kvm.
> > 
> > I am not 100% sure about TDX live migration support (TDX 1.5), though.
> > Supposedly even there are they should belong to /dev/kvm too.  + Wang, wei
> > to confirm.
> 
> Not /dev/kvm.
> TDX migration uses kvm device fd and implements a tdx-mig specific driver on it.

OK anyway so the "tdx-mig specific driver" will still be on top of KVM, and we
don't need a new device node at host for it.

-- 
Thanks,
-Kai