From: Dave Hansen <dave.hansen@intel.com>
To: "Reshetova, Elena" <elena.reshetova@intel.com>,
"Annapurve, Vishal" <vannapurve@google.com>,
"Gao, Chao" <chao.gao@intel.com>
Cc: "linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"Chatre, Reinette" <reinette.chatre@intel.com>,
"Weiny, Ira" <ira.weiny@intel.com>,
"Huang, Kai" <kai.huang@intel.com>,
"Williams, Dan J" <dan.j.williams@intel.com>,
"yilun.xu@linux.intel.com" <yilun.xu@linux.intel.com>,
"sagis@google.com" <sagis@google.com>,
"paulmck@kernel.org" <paulmck@kernel.org>,
"nik.borisov@suse.com" <nik.borisov@suse.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
"Kirill A. Shutemov" <kas@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v2 00/21] Runtime TDX Module update support
Date: Wed, 15 Oct 2025 08:02:30 -0700 [thread overview]
Message-ID: <5b4c2bb3-cfde-4559-a59d-0ff9f2a250b4@intel.com> (raw)
In-Reply-To: <IA1PR11MB949522AA3819E217C5467B51E7E8A@IA1PR11MB9495.namprd11.prod.outlook.com>
On 10/15/25 01:54, Reshetova, Elena wrote:
...
>> "Performing TD Preserving during a TD Build operation might result in
>> a corrupted TD hash in the TD attestation report. Until fixed in a
>> future Intel TDX module update, a host VMM can avoid the problem by
>> not conducting a TD Preserving Update while TD Build operation is in
>> progress."
>>
>> Do you know if this issue is fixed already? If so, what version of TDX
>> module fixes this issue?
>
> It is not fixed, because the limitation comes from the internal crypto context
> maintained by the IPP crypto library.
Does the TD attestation report contain information about the TDX module?
Isn't that information in flux during a module update?
...
> But the situation can be avoided fully, if TD preserving update is not conducted
> during the TD build time.
Sure, and the TDX module itself could guarantee this as well as much as
the kernel could. It could decline to allow module updates during TD
builds, or error out the TD build if it collides with an update.
next prev parent reply other threads:[~2025-10-15 15:03 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-01 2:52 [PATCH v2 00/21] Runtime TDX Module update support Chao Gao
2025-10-01 2:52 ` [PATCH v2 01/21] x86/virt/tdx: Print SEAMCALL leaf numbers in decimal Chao Gao
2025-10-01 2:52 ` [PATCH v2 02/21] x86/virt/tdx: Use %# prefix for hex values in SEAMCALL error messages Chao Gao
2025-10-01 2:52 ` [PATCH v2 03/21] x86/virt/tdx: Move low level SEAMCALL helpers out of <asm/tdx.h> Chao Gao
2025-10-01 2:52 ` [PATCH v2 04/21] x86/virt/tdx: Prepare to support P-SEAMLDR SEAMCALLs Chao Gao
2025-10-01 2:52 ` [PATCH v2 05/21] x86/virt/seamldr: Introduce a wrapper for " Chao Gao
2025-10-01 2:52 ` [PATCH v2 06/21] x86/virt/seamldr: Retrieve P-SEAMLDR information Chao Gao
2025-10-01 2:52 ` [PATCH v2 07/21] coco/tdx-host: Expose P-SEAMLDR information via sysfs Chao Gao
2025-10-30 21:54 ` Sagi Shahar
2025-10-30 23:05 ` dan.j.williams
2025-10-31 14:31 ` Sagi Shahar
2025-10-01 2:52 ` [PATCH v2 08/21] coco/tdx-host: Implement FW_UPLOAD sysfs ABI for TDX Module updates Chao Gao
2025-10-01 2:52 ` [PATCH v2 09/21] x86/virt/seamldr: Block TDX Module updates if any CPU is offline Chao Gao
2025-10-01 2:52 ` [PATCH v2 10/21] x86/virt/seamldr: Verify availability of slots for TDX Module updates Chao Gao
2025-10-01 2:52 ` [PATCH v2 11/21] x86/virt/seamldr: Allocate and populate a module update request Chao Gao
2025-10-01 2:52 ` [PATCH v2 12/21] x86/virt/seamldr: Introduce skeleton for TDX Module updates Chao Gao
2025-10-01 2:52 ` [PATCH v2 13/21] x86/virt/seamldr: Abort updates if errors occurred midway Chao Gao
2025-10-01 2:52 ` [PATCH v2 14/21] x86/virt/seamldr: Shut down the current TDX module Chao Gao
2025-10-01 2:52 ` [PATCH v2 15/21] x86/virt/tdx: Reset software states after TDX module shutdown Chao Gao
2025-10-01 2:53 ` [PATCH v2 16/21] x86/virt/seamldr: Handle TDX Module update failures Chao Gao
2025-10-28 2:53 ` Chao Gao
2025-10-01 2:53 ` [PATCH v2 17/21] x86/virt/seamldr: Install a new TDX Module Chao Gao
2025-10-01 2:53 ` [PATCH v2 18/21] x86/virt/seamldr: Do TDX per-CPU initialization after updates Chao Gao
2025-10-01 2:53 ` [PATCH v2 19/21] x86/virt/tdx: Establish contexts for the new TDX Module Chao Gao
2025-10-01 2:53 ` [PATCH v2 20/21] x86/virt/tdx: Update tdx_sysinfo and check features post-update Chao Gao
2025-10-01 2:53 ` [PATCH v2 21/21] x86/virt/tdx: Enable TDX Module runtime updates Chao Gao
2025-10-14 15:32 ` [PATCH v2 00/21] Runtime TDX Module update support Vishal Annapurve
2025-10-15 8:54 ` Reshetova, Elena
2025-10-15 14:19 ` Vishal Annapurve
2025-10-16 6:48 ` Reshetova, Elena
2025-10-15 15:02 ` Dave Hansen [this message]
2025-10-16 6:46 ` Reshetova, Elena
2025-10-16 17:47 ` Vishal Annapurve
2025-10-17 10:08 ` Reshetova, Elena
2025-10-18 0:01 ` Vishal Annapurve
2025-10-21 13:42 ` Reshetova, Elena
2025-10-22 7:14 ` Chao Gao
2025-10-22 15:42 ` Vishal Annapurve
2025-10-23 20:31 ` Vishal Annapurve
2025-10-23 21:10 ` Dave Hansen
2025-10-23 22:00 ` Vishal Annapurve
2025-10-24 7:43 ` Chao Gao
2025-10-24 18:02 ` Dave Hansen
2025-10-24 19:40 ` dan.j.williams
2025-10-24 20:00 ` Sean Christopherson
2025-10-24 20:14 ` Dave Hansen
2025-10-24 21:09 ` Vishal Annapurve
2025-10-24 20:13 ` Dave Hansen
2025-10-24 21:12 ` dan.j.williams
2025-10-24 21:19 ` Dave Hansen
2025-10-25 0:54 ` Vishal Annapurve
2025-10-25 1:42 ` dan.j.williams
2025-10-25 11:55 ` Vishal Annapurve
2025-10-25 12:01 ` Vishal Annapurve
2025-10-26 21:30 ` dan.j.williams
2025-10-26 22:01 ` Vishal Annapurve
2025-10-27 18:53 ` dan.j.williams
2025-10-28 0:42 ` Vishal Annapurve
2025-10-28 2:13 ` dan.j.williams
2025-10-28 17:00 ` Erdem Aktas
2025-10-29 0:56 ` Sean Christopherson
2025-10-29 2:17 ` dan.j.williams
2025-10-29 13:48 ` Sean Christopherson
2025-10-30 17:01 ` Vishal Annapurve
2025-10-31 2:53 ` Chao Gao
2025-11-19 22:44 ` Sagi Shahar
2025-11-20 2:47 ` Chao Gao
2025-10-28 23:48 ` Vishal Annapurve
2025-10-28 20:29 ` dan.j.williams
2025-10-28 20:32 ` dan.j.williams
2025-10-31 16:55 ` Sagi Shahar
2025-10-31 17:57 ` Vishal Annapurve
2025-11-01 2:18 ` Chao Gao
2025-11-01 2:05 ` Chao Gao
2025-11-12 14:09 ` Chao Gao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5b4c2bb3-cfde-4559-a59d-0ff9f2a250b4@intel.com \
--to=dave.hansen@intel.com \
--cc=bp@alien8.de \
--cc=chao.gao@intel.com \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=elena.reshetova@intel.com \
--cc=hpa@zytor.com \
--cc=ira.weiny@intel.com \
--cc=kai.huang@intel.com \
--cc=kas@kernel.org \
--cc=linux-coco@lists.linux.dev \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=nik.borisov@suse.com \
--cc=paulmck@kernel.org \
--cc=pbonzini@redhat.com \
--cc=reinette.chatre@intel.com \
--cc=rick.p.edgecombe@intel.com \
--cc=sagis@google.com \
--cc=tglx@linutronix.de \
--cc=vannapurve@google.com \
--cc=x86@kernel.org \
--cc=yilun.xu@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).