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From: Isaku Yamahata <isaku.yamahata@gmail.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Kuppuswamy Sathyanarayanan 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Tony Luck <tony.luck@intel.com>, Andi Kleen <ak@linux.intel.com>,
	Kai Huang <kai.huang@intel.com>,
	Wander Lairson Costa <wander@redhat.com>,
	Isaku Yamahata <isaku.yamahata@gmail.com>,
	marcelo.cerri@canonical.com, tim.gardner@canonical.com,
	khalid.elmously@canonical.com, philip.cox@canonical.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 5/5] x86/tdx: Add Quote generation support
Date: Fri, 22 Jul 2022 12:05:24 -0700	[thread overview]
Message-ID: <20220722190524.GA3299911@ls.amr.corp.intel.com> (raw)
In-Reply-To: <403cfccb-7fff-ab0b-8ebd-e5b04e631571@intel.com>

On Thu, Jul 21, 2022 at 05:27:08PM -0700,
Dave Hansen <dave.hansen@intel.com> wrote:

> On 6/8/22 19:52, Kuppuswamy Sathyanarayanan wrote:
> > In TDX guest, the second stage in attestation process is to send the
> > TDREPORT to QE/QGS to generate the TD Quote. For platforms that does
> > not support communication channels like vsock or TCP/IP, implement
> > support to get TD Quote using hypercall. GetQuote hypercall can be used
> > by the TD guest to request VMM facilitate the Quote generation via
> > QE/QGS. More details about GetQuote hypercall can be found in TDX
> > Guest-Host Communication Interface (GHCI) for Intel TDX 1.0, section
> > titled "TDG.VP.VMCALL<GetQuote>.
> 
> So, the quote portion of this is basically a bidirectional blob sender.
>  It's to send a blob between guest userspace to host userspace.
> 
> Do we *REALLY* need specific driver functionality for this?  For
> instance, is there no existing virtio device that can send blobs back
> and forth?

It's virtio-vsock.  If virtio-vsock is available, the communication works.
However, some users would like to disable virtio-vsock on their environment for
some reasons.  Even virtio at all.  Especially for confidential computing use
case.  It's their choice.  It can't be assumed that virtio is available.

The goal is VMM-agnostic (but TDX-specific) interface for that.
-- 
Isaku Yamahata <isaku.yamahata@gmail.com>

  reply	other threads:[~2022-07-22 19:05 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-09  2:52 [PATCH v8 0/5] Add TDX Guest Attestation support Kuppuswamy Sathyanarayanan
2022-06-09  2:52 ` [PATCH v8 1/5] x86/tdx: Add TDX Guest attestation interface driver Kuppuswamy Sathyanarayanan
2022-06-24 16:51   ` Dave Hansen
2022-06-27 14:50     ` Sathyanarayanan Kuppuswamy
2022-06-27 17:24       ` Dave Hansen
2022-06-30 23:50         ` Sathyanarayanan Kuppuswamy
2022-07-05 12:07           ` Kai Huang
2022-07-05 18:45             ` Sathyanarayanan Kuppuswamy
2022-07-05 18:52               ` Dave Hansen
2022-07-05 21:21                 ` Sathyanarayanan Kuppuswamy
2022-07-05 22:31                   ` Kai Huang
2022-07-06 22:27                     ` Sathyanarayanan Kuppuswamy
2022-07-06 22:59                       ` Kai Huang
2022-07-18 22:52                       ` Sathyanarayanan Kuppuswamy
2022-06-09  2:52 ` [PATCH v8 2/5] x86/tdx: Add TDX Guest event notify interrupt support Kuppuswamy Sathyanarayanan
2022-06-20 12:33   ` Kai Huang
2022-06-20 15:44     ` Sathyanarayanan Kuppuswamy
2022-06-23  9:46       ` Kai Huang
2022-06-23 10:24       ` Kai Huang
2022-06-24 22:23       ` Sathyanarayanan Kuppuswamy
2022-06-24 23:41       ` Nakajima, Jun
2022-06-25  3:35         ` Yao, Jiewen
2022-06-27 11:21           ` Kai Huang
2022-06-27 14:56             ` Sathyanarayanan Kuppuswamy
2022-07-14  0:46             ` Sathyanarayanan Kuppuswamy
2022-07-14 10:42               ` Kai Huang
2022-07-14 20:55                 ` Sathyanarayanan Kuppuswamy
2022-07-14 23:58                   ` Kai Huang
2022-06-09  2:52 ` [PATCH v8 3/5] x86/mm: Make tdx_enc_status_changed() vmalloc address compatible Kuppuswamy Sathyanarayanan
2022-06-09  2:52 ` [PATCH v8 4/5] x86/mm: Add noalias variants of set_memory_*crypted() functions Kuppuswamy Sathyanarayanan
2022-06-24 13:19   ` Dave Hansen
2022-06-27 15:12     ` Kirill A. Shutemov
2022-06-27 18:24       ` Dave Hansen
2022-06-28  1:15         ` Kai Huang
2022-07-05 15:29           ` Kirill A. Shutemov
2022-07-18 14:22             ` Sathyanarayanan Kuppuswamy
2022-07-19 16:13               ` Kirill A. Shutemov
2022-07-19 17:10                 ` Sathyanarayanan Kuppuswamy
2022-07-19 21:55                   ` Kirill A. Shutemov
2022-07-20 14:56                     ` Sathyanarayanan Kuppuswamy
2022-07-20 16:17                       ` Kirill A. Shutemov
2022-07-20 16:58                         ` Sathyanarayanan Kuppuswamy
2022-06-09  2:52 ` [PATCH v8 5/5] x86/tdx: Add Quote generation support Kuppuswamy Sathyanarayanan
2022-06-14 12:30   ` Wander Lairson Costa
2022-06-14 12:58     ` Sathyanarayanan Kuppuswamy
2022-07-21 16:08   ` Dave Hansen
2022-07-21 16:42     ` Sathyanarayanan Kuppuswamy
2022-07-21 16:49       ` Dave Hansen
2022-07-21 16:54         ` Sathyanarayanan Kuppuswamy
2022-07-21 17:02           ` Dave Hansen
2022-07-21 17:16             ` Sathyanarayanan Kuppuswamy
2022-07-21 17:19               ` Dave Hansen
2022-07-21 18:31                 ` Sathyanarayanan Kuppuswamy
2022-07-21 18:42                 ` Isaku Yamahata
2022-07-21 18:52                   ` Dave Hansen
2022-07-21 18:57                     ` Sathyanarayanan Kuppuswamy
2022-07-21 19:23                       ` Dave Hansen
2022-07-21 22:08                         ` Sathyanarayanan Kuppuswamy
2022-07-21 23:16                         ` Kai Huang
2022-07-21 23:32     ` Kai Huang
2022-07-22  0:27   ` Dave Hansen
2022-07-22 19:05     ` Isaku Yamahata [this message]
2022-07-22 19:13       ` Dave Hansen
2022-07-22 21:18         ` Sathyanarayanan Kuppuswamy
2022-07-22 21:24           ` Dave Hansen
2022-07-25 20:19           ` Nakajima, Jun
2022-07-25 20:23             ` Dave Hansen
2022-07-25 21:56               ` Nakajima, Jun
2022-07-25 22:06                 ` Sathyanarayanan Kuppuswamy
2022-08-09  6:20               ` Guorui Yu
2022-11-21  2:04                 ` Guorui Yu
2022-11-21  2:26                   ` Dave Hansen
2023-01-07  0:58                     ` Erdem Aktas
2022-07-25 11:05         ` Kai Huang
2022-06-24 18:24 ` [PATCH v8 0/5] Add TDX Guest Attestation support Dave Hansen
2022-06-27 14:51   ` Sathyanarayanan Kuppuswamy
2022-06-27 18:51     ` Dave Hansen

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