From nobody Sat Oct 4 19:16:49 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) (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 86D13301ABA; Wed, 13 Aug 2025 23:59:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755129593; cv=none; b=mOuCFPM1b5vFscP6NiRDVenFOVPBDlyBNGLyCC8zKncQXfgRyKs0oT33kClwSMJpDEu16aYzQJX1xIkKUZLwK+T3CZvAjiyOXivjeHGPDJLQzSi7DRPllK/MJRTWd4L6pYaGpDK6JpZxZ40frHQ78RJgx0eacdvQTGCkruAvw4I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755129593; c=relaxed/simple; bh=ObPUqNlIio++VGV8CmQ4YDrJyoIrTWqqB4hd4548ko4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Su8Z+TeadqTymyU7WadU0IyChqfklgxALLns5ozdVRFnP1wG277Z89zc/FAEIZfs+dGYbCBG3KXm9CzV9wpC/Yvuqj/utwIMkvY2FcC8hZDx7kN5IZsJU4mQ300GTgOhOR+tgRh+JNlAOgRQnErMlEDYA5uKri6HVGa+KUcuH3E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=VZwdUYNe; arc=none smtp.client-ip=198.175.65.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="VZwdUYNe" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1755129591; x=1786665591; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ObPUqNlIio++VGV8CmQ4YDrJyoIrTWqqB4hd4548ko4=; b=VZwdUYNeslKQhzAgGENmfjbB1RJMQ/IwUW2LnuYHyHyHsYUPJFwJN4fd AdyUgSEgEs6FBwkIWftyHvK1+5sTc1EXTtDYvAAryDCuGiIzK0nmUTE+Y HXIr0zEJ9HMQ7cgsqpry7RTAInShidS8/B+YWwju8VDORmjkwHTvAoJ6g J1ZsI/l7Kl35JRdMSrd5mZe/6mBVmqMt9YlSprASv1ZdfbS+zvqSfEL6T qfWhbyIT9BrcbFIM2G6r/6/fl7rrHooM/D87hVcsD2wXGju2XRNSVqOrc w8qlcOoOK5wHHizUR9CqI61sG2xW8Ot89Vo6XONANUiKtwA0dqYbbDp8y g==; X-CSE-ConnectionGUID: sZs1+CtpTOW2vIMzLLf4gg== X-CSE-MsgGUID: zqek1qAYQ4elrUCoc4NmsA== X-IronPort-AV: E=McAfee;i="6800,10657,11520"; a="80014725" X-IronPort-AV: E=Sophos;i="6.17,287,1747724400"; d="scan'208";a="80014725" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2025 16:59:51 -0700 X-CSE-ConnectionGUID: B8Hw4YhmSfmRDWDk7SR/BA== X-CSE-MsgGUID: 0SLtXStxR9OvIxjimvo8Hw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.17,287,1747724400"; d="scan'208";a="166105149" Received: from mgerlach-mobl1.amr.corp.intel.com (HELO khuang2-desk.gar.corp.intel.com) ([10.124.222.250]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2025 16:59:46 -0700 From: Kai Huang To: dave.hansen@intel.com, bp@alien8.de, tglx@linutronix.de, peterz@infradead.org, mingo@redhat.com, hpa@zytor.com, thomas.lendacky@amd.com Cc: x86@kernel.org, kas@kernel.org, rick.p.edgecombe@intel.com, dwmw@amazon.co.uk, linux-kernel@vger.kernel.org, pbonzini@redhat.com, seanjc@google.com, kvm@vger.kernel.org, reinette.chatre@intel.com, isaku.yamahata@intel.com, dan.j.williams@intel.com, ashish.kalra@amd.com, nik.borisov@suse.com, chao.gao@intel.com, sagis@google.com, farrah.chen@intel.com Subject: [PATCH v6 5/7] x86/virt/tdx: Remove the !KEXEC_CORE dependency Date: Thu, 14 Aug 2025 11:59:05 +1200 Message-ID: X-Mailer: git-send-email 2.50.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" During kexec it is now guaranteed that all dirty cachelines of TDX private memory are flushed before jumping to the new kernel. The TDX private memory from the old kernel will remain as TDX private memory in the new kernel, but it is OK because kernel read/write to TDX private memory will never cause machine check, except on the platforms with the TDX partial write erratum, which has already been handled. It is safe to allow kexec to work together with TDX now. Remove the !KEXEC_CORE dependency. Signed-off-by: Kai Huang Tested-by: Farrah Chen Reviewed-by: Rick Edgecombe --- arch/x86/Kconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 58d890fe2100..e2cbfb021bc6 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1896,7 +1896,6 @@ config INTEL_TDX_HOST depends on X86_X2APIC select ARCH_KEEP_MEMBLOCK depends on CONTIG_ALLOC - depends on !KEXEC_CORE depends on X86_MCE help Intel Trust Domain Extensions (TDX) protects guest VMs from malicious --=20 2.50.1