From nobody Sun May 24 19:34:23 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6315936F918; Fri, 22 May 2026 17:26:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779470782; cv=none; b=U6gQv8MwkXKzHmV+Ubk7LNaXi9GyxR9Ga3PcmctCVMpcEiOvEr/dLanWA0tmrlPdvKxRfiDQOhYJDl5HwUTYVG7ARnard0jCu4Js429cwIYEHp7I33admTLF9Itlsm5CFZ/ukx2EDK4HMWFlF7WZ3UUeSSg4y8h4dj5t2afDmdk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779470782; c=relaxed/simple; bh=t6MxN/YhatapfG1rsAdJWh+71uynjnC7VdkbtlycyOM=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=Iyn1ux4U6PA/rgXhE7ZsqikJl8cWmatpgOnVQcw7WGpMCK9Kx8kx96u68slplWe5P7Gxlm7xLthEKBlXSv7TpOFTfdiMorygLNgW5xeUa9CVhRfGT+AXsoQIv2h9u8NMByUNfQU5lSgQBv5KQC0eDALcTybI01WWkptrZo7KEf8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=CSloyPi7; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=yM4Eg6xN; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="CSloyPi7"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="yM4Eg6xN" Date: Fri, 22 May 2026 17:26:17 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1779470778; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ALBtbK2YR7Fb79a3Tx4YQ5NpbqPUErjYH+rrrx8t2Ww=; b=CSloyPi71SPRfJQlGP0NeVmKcxZZiGJqFNQp0c0xnlzBaX4TQCKrGGW0fa29bYp+wxLR4R dji/QmiFmS21ChYFZlQ+KQ0o7xll5tY5LinNyaJ3sES8RSlGSPAbjsKdhbcGSRMxBvP+GH N6gRp1vYBUexX29giSAliWFDccVsMo6FjvHkSBCg3bUy7EX+M5bsloOlyBZL98BkIzqWBf aFSBXWTShRVeWznJOiAUSFaTPjjN4Z/mMlQH8/DC6300dfNO+gEOfPt15hKOC3gu+GeQVD 1hePdyxK28tFO8vHr2IEF+f7mC0frNzxyv6phXeXhL1JdHTJQatxGoy4qv/2uw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1779470778; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ALBtbK2YR7Fb79a3Tx4YQ5NpbqPUErjYH+rrrx8t2Ww=; b=yM4Eg6xNJ0KNNuZVqmG9lnU+1BIta2zHoKpa9cPK9GKb9oJdGG6EPNJ88UEyqG+Z3rzA62 CIKut1epWcvlHiDQ== From: "tip-bot2 for Chao Gao" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/tdx] x86/virt/seamldr: Abort updates after a failed step Cc: Chao Gao , Dave Hansen , Xu Yilun , Tony Lindgren , Kai Huang , "Kiryl Shutsemau (Meta)" , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20260520222904.645A6FD4@davehans-spike.ostc.intel.com> References: <20260520222904.645A6FD4@davehans-spike.ostc.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <177947077733.711.9824247346336463471.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the x86/tdx branch of tip: Commit-ID: c507e80de9471234536953ee2605e569a7de2306 Gitweb: https://git.kernel.org/tip/c507e80de9471234536953ee2605e569a= 7de2306 Author: Chao Gao AuthorDate: Wed, 20 May 2026 15:29:04 -07:00 Committer: Dave Hansen CommitterDate: Wed, 20 May 2026 15:37:10 -07:00 x86/virt/seamldr: Abort updates after a failed step A TDX module update is a multi-step process, and any step can fail. The current update flow continues to later steps after an error. Continuing after a failure can cause the TDX module to enter an unrecoverable state. But certain failures during the initial module shutdown step should simply return an error to userspace, so the update can be retried cleanly. To preserve that recoverability, one option would be to abort the update only for those failures, since they occur before any TDX module state is changed. But special-casing specific failures in specific steps would complicate the do-while() update loop for no benefit. Simply abort update on any failure, at any step. Track failures for each step, stop the update loop once a failure is observed, and do not advance the state machine to the next step. [ dhansen: style nits ] Signed-off-by: Chao Gao Signed-off-by: Dave Hansen Reviewed-by: Xu Yilun Reviewed-by: Tony Lindgren Reviewed-by: Kai Huang Reviewed-by: Kiryl Shutsemau (Meta) Link: https://lore.kernel.org/linux-coco/aQFmOZCdw64z14cJ@google.com/ # [1] Link: https://patch.msgid.link/20260520133909.409394-16-chao.gao@intel.com Link: https://patch.msgid.link/20260520222904.645A6FD4@davehans-spike.ostc.= intel.com --- arch/x86/virt/vmx/tdx/seamldr.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/x86/virt/vmx/tdx/seamldr.c b/arch/x86/virt/vmx/tdx/seamld= r.c index ec45b85..b03dce2 100644 --- a/arch/x86/virt/vmx/tdx/seamldr.c +++ b/arch/x86/virt/vmx/tdx/seamldr.c @@ -202,6 +202,7 @@ enum module_update_state { static struct update_ctrl { enum module_update_state state; int num_ack; + int num_failed; /* * Protect update_ctrl. Raw spinlock as it will be acquired from * interrupt-disabled contexts. @@ -219,12 +220,13 @@ static void __set_target_state(struct update_ctrl *ct= rl, } =20 /* Last one to ack a state moves to the next state. */ -static void ack_state(struct update_ctrl *ctrl) +static void ack_state(struct update_ctrl *ctrl, int result) { raw_spin_lock(&ctrl->lock); =20 + ctrl->num_failed +=3D !!result; ctrl->num_ack++; - if (ctrl->num_ack =3D=3D num_online_cpus()) + if (ctrl->num_ack =3D=3D num_online_cpus() && !ctrl->num_failed) __set_target_state(ctrl, ctrl->state + 1); =20 raw_spin_unlock(&ctrl->lock); @@ -234,6 +236,7 @@ static void init_state(struct update_ctrl *ctrl) { raw_spin_lock_init(&ctrl->lock); __set_target_state(ctrl, MODULE_UPDATE_START + 1); + ctrl->num_failed =3D 0; } =20 /* @@ -261,8 +264,9 @@ static int do_seamldr_install_module(void *seamldr_para= ms) break; } =20 - ack_state(&update_ctrl); - } while (curstate !=3D MODULE_UPDATE_DONE); + ack_state(&update_ctrl, ret); + } while (curstate !=3D MODULE_UPDATE_DONE && + !READ_ONCE(update_ctrl.num_failed)); =20 return ret; }