From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 280EFC87FC5 for ; Mon, 21 Jul 2025 07:02:00 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1udkWP-0002mW-9d; Mon, 21 Jul 2025 03:01:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1udkWA-0002fh-Qc for qemu-devel@nongnu.org; Mon, 21 Jul 2025 03:01:01 -0400 Received: from mgamail.intel.com ([192.198.163.12]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1udkW4-0005n3-WA for qemu-devel@nongnu.org; Mon, 21 Jul 2025 03:00:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1753081253; x=1784617253; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=k/TAaWSXHX/7A6kEJcH3ylHERJw5T2U3vNI/+sglqZA=; b=d7Ie8eSvHKAQ/G0CuJBdZEUTOVcoVPmA6U7MBHnM8dfIshBsqXtETKa7 62eQiMeDFDuKJWR+YuTKrn4f4UYuDUHSMu90cwrzrISimCRivKN/DP3H9 RDcc0W23BDKYaXBos7kXjfqLqK16ASsCZEBqufQFU7G5DkSARvZkpe6lP F+kjnhUzAFpL4I8IEcYvIJjDfiEv3zAJ+XazxcuLkxHdrcdqDQCPVlfx6 kzlscrPEgzw6ufQn59eZB51TL7Q/2ue104Gey8VR4xPBwI6dyhyvaFF3e MVsDgUgDDqDekL4RgKQLhDqBRt/ssu+Gqp1GKPv0FNTouJ26N9aSO+cZr w==; X-CSE-ConnectionGUID: 6pa67n3fTZ6EH/arv/aZhw== X-CSE-MsgGUID: xJunZyu9QaOjkR3p7YFkiA== X-IronPort-AV: E=McAfee;i="6800,10657,11498"; a="59099907" X-IronPort-AV: E=Sophos;i="6.16,328,1744095600"; d="scan'208";a="59099907" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jul 2025 00:00:48 -0700 X-CSE-ConnectionGUID: 8a5hHC3SSAu4jFbWBdZkww== X-CSE-MsgGUID: cWPg/EDpRnyXw88jogLF3A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,328,1744095600"; d="scan'208";a="158067516" Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orviesa010.jf.intel.com with ESMTP; 21 Jul 2025 00:00:46 -0700 From: Xiaoyao Li To: David Hildenbrand , Igor Mammedov , Paolo Bonzini Cc: qemu-devel@nongnu.org, Xiaoyao Li , Stefano Garzarella Subject: [PATCH] hostmem/shm: Allow shm memory backend serve as shared memory for coco-VMs Date: Mon, 21 Jul 2025 14:52:20 +0800 Message-ID: <20250721065220.895606-1-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=192.198.163.12; envelope-from=xiaoyao.li@intel.com; helo=mgamail.intel.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.088, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.999, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org shm can surely serve as the shared memory for coco-VMs. But currently it doesn't check the backend->guest_memfd to pass down the RAM_GUEST_MEMFD flag. It leads to failure when creating coco-VMs (e.g., TDX guest) which require private mmeory. Set and pass down RAM_GUEST_MEMFD when backend->guest_memfd is true, to allow shm memory backend serve as shared memory for coco-VMs. cc: Stefano Garzarella Signed-off-by: Xiaoyao Li --- backends/hostmem-shm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/backends/hostmem-shm.c b/backends/hostmem-shm.c index f66211a2ec92..806e2670e039 100644 --- a/backends/hostmem-shm.c +++ b/backends/hostmem-shm.c @@ -54,6 +54,7 @@ have_fd: /* Let's do the same as memory-backend-ram,share=on would do. */ ram_flags = RAM_SHARED; ram_flags |= backend->reserve ? 0 : RAM_NORESERVE; + ram_flags |= backend->guest_memfd ? RAM_GUEST_MEMFD : 0; return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), backend_name, backend->size, -- 2.43.0