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From: Peter Fang <peter.fang@intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Xu Yilun <yilun.xu@linux.intel.com>, <x86@kernel.org>,
	<kvm@vger.kernel.org>, <linux-coco@lists.linux.dev>,
	<linux-kernel@vger.kernel.org>, <djbw@kernel.org>,
	<kas@kernel.org>, <rick.p.edgecombe@intel.com>,
	<yilun.xu@intel.com>, <xiaoyao.li@intel.com>,
	<sohil.mehta@intel.com>, <adrian.hunter@intel.com>,
	<kishen.maloor@intel.com>, <tony.lindgren@linux.intel.com>,
	<baolu.lu@linux.intel.com>, <zhenzhong.duan@intel.com>,
	<dave.hansen@intel.com>, <dave.hansen@linux.intel.com>
Subject: Re: [PATCH v2 16/17] KVM: TDX: Add in-kernel Quote generation
Date: Mon, 29 Jun 2026 03:03:01 -0700	[thread overview]
Message-ID: <20260629100301.GA1743876@pedri> (raw)
In-Reply-To: <aj1tFuwZWdPGfUoG@google.com>

On Thu, Jun 25, 2026 at 11:01:58AM -0700, Sean Christopherson wrote:
> On Thu, Jun 18, 2026, Xu Yilun wrote:
> > From: Peter Fang <peter.fang@intel.com>
> > 
> > Provide an in-kernel path for Quote generation when handling
> > TDG.VP.VMCALL<GetQuote>, without requiring an exit to userspace.
> 
> Why?
> 

Hi Sean,

This is mainly to avoid a round trip to userspace for the GetQuote flow.

New TDX modules can now get a Quote directly via an "extension SEAMCALL"
instead of exiting to userspace and using an SGX enclave. Exiting to
userspace for GetQuote no longer seems worth the overhead/complexity.

The first half of the series enables extension SEAMCALLs. They implement
simple APIs for higher-order security protocols that would otherwise need
to be broken into smaller routines. For Quoting, this allows KVM to get
a Quote directly through TDH.QUOTE.GET. The TDX module needs only the
input data from TDG.VP.VMCALL<GetQuote> for that call.

Thanks,
Peter

  reply	other threads:[~2026-06-29 10:03 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-18  8:13 [PATCH v2 00/17] Enable DICE-based TDX Quoting Extension Xu Yilun
2026-06-18  8:13 ` [PATCH v2 01/17] x86/virt/tdx: Embed version info in SEAMCALL leaf function definitions Xu Yilun
2026-06-18 14:45   ` Dave Hansen
2026-06-22 12:05     ` Xu Yilun
2026-06-18  8:13 ` [PATCH v2 02/17] x86/virt/tdx: Configure add-on features on TDX module init and update Xu Yilun
2026-06-18 15:04   ` Dave Hansen
2026-06-22 13:15     ` Xu Yilun
2026-06-24 12:00     ` Xu Yilun
2026-06-24 22:10       ` Peter Fang
2026-06-25  6:33         ` Xu Yilun
2026-06-23  8:43   ` Chao Gao
2026-06-25 10:50     ` Xu Yilun
2026-06-18  8:13 ` [PATCH v2 03/17] x86/virt/tdx: Detect if the extensions initialization is required Xu Yilun
2026-06-25  5:19   ` Tony Lindgren
2026-06-25 10:57     ` Xu Yilun
2026-06-29  6:33   ` Chao Gao
2026-06-30 11:10     ` Xu Yilun
2026-06-18  8:13 ` [PATCH v2 04/17] x86/virt/tdx: Add extra memory to TDX module for the extensions Xu Yilun
2026-06-29  7:56   ` Chao Gao
2026-06-30 10:27     ` Xu Yilun
2026-06-18  8:13 ` [PATCH v2 05/17] x86/virt/tdx: Make TDX module initialize " Xu Yilun
2026-06-18  8:13 ` [PATCH v2 06/17] x86/virt/tdx: Re-initialize the extensions on runtime TDX module update Xu Yilun
2026-06-29  8:12   ` Chao Gao
2026-06-30 11:14     ` Xu Yilun
2026-06-18  8:13 ` [PATCH v2 07/17] x86/virt/tdx: Initialize Quoting extension Xu Yilun
2026-06-29  8:33   ` Chao Gao
2026-06-30  5:20     ` Peter Fang
2026-06-18  8:13 ` [PATCH v2 08/17] x86/virt/tdx: Prepare Quote buffer during extension bringup Xu Yilun
2026-06-25  6:08   ` Tony Lindgren
2026-06-30  4:12     ` Peter Fang
2026-06-18  8:13 ` [PATCH v2 09/17] x86/virt/tdx: Add interface to check Quoting availability Xu Yilun
2026-06-25  6:09   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 10/17] x86/virt/tdx: Move tdx_tdr_pa() up in the file Xu Yilun
2026-06-25  6:10   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 11/17] x86/virt/tdx: Add interface to generate a Quote Xu Yilun
2026-06-25  6:05   ` Tony Lindgren
2026-06-30  4:22     ` Peter Fang
2026-06-18  8:13 ` [PATCH v2 12/17] x86/virt/tdx: Reinitialize the Quoting extension after TDX module update Xu Yilun
2026-06-25  6:12   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 13/17] x86/virt/tdx: Enable Quoting extension Xu Yilun
2026-06-25  6:13   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 14/17] x86/tdx: Move and rename Quote request structure Xu Yilun
2026-06-25  6:15   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 15/17] KVM: TDX: Factor out userspace return path from tdx_get_quote() Xu Yilun
2026-06-25  6:16   ` Tony Lindgren
2026-06-18  8:13 ` [PATCH v2 16/17] KVM: TDX: Add in-kernel Quote generation Xu Yilun
2026-06-25 18:01   ` Sean Christopherson
2026-06-29 10:03     ` Peter Fang [this message]
2026-06-30  0:42       ` Sean Christopherson
2026-06-18  8:13 ` [PATCH v2 17/17] KVM: TDX: Support event-notify interrupts only with userspace Quoting Xu Yilun
2026-06-25  6:28   ` Tony Lindgren
2026-06-30  6:36     ` Peter Fang

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