From: Chao Gao <chao.gao@intel.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: <kvm@vger.kernel.org>, <linux-coco@lists.linux.dev>,
<linux-kernel@vger.kernel.org>, <x86@kernel.org>,
<binbin.wu@linux.intel.com>, <dave.hansen@linux.intel.com>,
<djbw@kernel.org>, <ira.weiny@intel.com>, <kai.huang@intel.com>,
<kas@kernel.org>, <nik.borisov@suse.com>, <paulmck@kernel.org>,
<pbonzini@redhat.com>, <reinette.chatre@intel.com>,
<rick.p.edgecombe@intel.com>, <sagis@google.com>,
<seanjc@google.com>, <tony.lindgren@linux.intel.com>,
<vannapurve@google.com>, <vishal.l.verma@intel.com>,
<yilun.xu@linux.intel.com>, <xiaoyao.li@intel.com>,
<yan.y.zhao@intel.com>, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v8 09/21] x86/virt/seamldr: Introduce skeleton for TDX module updates
Date: Wed, 6 May 2026 21:00:00 +0800 [thread overview]
Message-ID: <afs7UATlAuDehCCB@intel.com> (raw)
In-Reply-To: <5dc70847-332d-496f-b0ab-03323eff7118@intel.com>
On Thu, Apr 30, 2026 at 01:03:53PM -0700, Dave Hansen wrote:
>On 4/27/26 08:28, Chao Gao wrote:
>> +static struct {
>> + enum module_update_state state;
>> + int thread_ack;
>
>multi_stop_data has an atomic_t for this.
>
>You have an int.
>
>Which one is right?
You pointed out that using atomic_t and memory barriers for synchronization was
overly complicated. So, I switched to use a spinlock, and thread_ack can now be
a plain int.
See https://lore.kernel.org/kvm/31936a20-929f-489a-9dc6-0f8fcb9307f1@intel.com/
next prev parent reply other threads:[~2026-05-06 13:00 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-27 15:27 [PATCH v8 00/21] Runtime TDX module update support Chao Gao
2026-04-27 15:27 ` [PATCH v8 01/21] x86/virt/tdx: Move low level SEAMCALL helpers out of <asm/tdx.h> Chao Gao
2026-04-27 18:12 ` Vishal Annapurve
2026-04-27 15:27 ` [PATCH v8 02/21] coco/tdx-host: Introduce a "tdx_host" device Chao Gao
2026-04-27 15:27 ` [PATCH v8 03/21] coco/tdx-host: Expose TDX module version Chao Gao
2026-04-27 15:27 ` [PATCH v8 04/21] x86/virt/seamldr: Introduce a wrapper for P-SEAMLDR SEAMCALLs Chao Gao
2026-04-27 15:27 ` [PATCH v8 05/21] x86/virt/seamldr: Add a helper to retrieve P-SEAMLDR information Chao Gao
2026-04-27 15:28 ` [PATCH v8 06/21] coco/tdx-host: Expose P-SEAMLDR information via sysfs Chao Gao
2026-04-27 15:28 ` [PATCH v8 07/21] coco/tdx-host: Implement firmware upload sysfs ABI for TDX module updates Chao Gao
2026-04-29 23:17 ` Dave Hansen
2026-05-06 2:35 ` Chao Gao
2026-04-27 15:28 ` [PATCH v8 08/21] x86/virt/seamldr: Allocate and populate a module update request Chao Gao
2026-04-30 0:45 ` Dave Hansen
2026-04-30 21:23 ` Edgecombe, Rick P
2026-04-30 21:31 ` Dave Hansen
2026-04-27 15:28 ` [PATCH v8 09/21] x86/virt/seamldr: Introduce skeleton for TDX module updates Chao Gao
2026-04-30 20:03 ` Dave Hansen
2026-05-06 13:00 ` Chao Gao [this message]
2026-04-27 15:28 ` [PATCH v8 10/21] x86/virt/seamldr: Shut down the current TDX module Chao Gao
2026-04-30 18:52 ` Dave Hansen
2026-05-06 2:56 ` Chao Gao
2026-04-27 15:28 ` [PATCH v8 11/21] x86/virt/tdx: Reset software states during TDX module shutdown Chao Gao
2026-04-30 18:58 ` Dave Hansen
2026-05-06 6:21 ` Chao Gao
2026-04-27 15:28 ` [PATCH v8 12/21] x86/virt/seamldr: Install a new TDX module Chao Gao
2026-04-30 19:00 ` Dave Hansen
2026-04-30 21:48 ` Edgecombe, Rick P
2026-04-30 22:29 ` Dave Hansen
2026-04-27 15:28 ` [PATCH v8 13/21] x86/virt/seamldr: Do TDX per-CPU initialization after module installation Chao Gao
2026-04-27 15:28 ` [PATCH v8 14/21] x86/virt/tdx: Restore TDX module state Chao Gao
2026-04-27 15:28 ` [PATCH v8 15/21] x86/virt/tdx: Refresh TDX module version after update Chao Gao
2026-04-30 19:14 ` Dave Hansen
2026-04-30 21:35 ` Edgecombe, Rick P
2026-05-06 12:51 ` Chao Gao
2026-04-27 15:28 ` [PATCH v8 16/21] x86/virt/tdx: Reject updates during concurrent TD build Chao Gao
2026-04-30 19:25 ` Dave Hansen
2026-04-27 15:28 ` [PATCH v8 17/21] x86/virt/seamldr: Abort updates on failure Chao Gao
2026-04-30 20:06 ` Dave Hansen
2026-04-27 15:28 ` [PATCH v8 18/21] coco/tdx-host: Don't expose P-SEAMLDR features on CPUs with erratum Chao Gao
2026-04-30 20:09 ` Dave Hansen
2026-04-27 15:28 ` [PATCH v8 19/21] x86/virt/tdx: Enable TDX module runtime updates Chao Gao
2026-04-27 15:28 ` [PATCH v8 20/21] coco/tdx-host: Document TDX module update compatibility criteria Chao Gao
2026-04-27 15:28 ` [PATCH v8 21/21] x86/virt/tdx: Document TDX module update Chao Gao
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