From patchwork Mon Nov 18 08:37:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?C=C3=A9dric_Le_Goater?= X-Patchwork-Id: 13878299 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 17B1DD43FEE for ; Mon, 18 Nov 2024 08:38:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tCxHK-0001x0-L8; Mon, 18 Nov 2024 03:38:38 -0500 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 1tCxGh-0001YT-MO for qemu-devel@nongnu.org; Mon, 18 Nov 2024 03:38:00 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tCxGg-000465-8j for qemu-devel@nongnu.org; Mon, 18 Nov 2024 03:37:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1731919075; h=from:from: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=FFMW8k47U5OHurm3wQXHfDb8dU2AP+okgUT5HYiHDCc=; b=bpLxMWyk6RwGoizGhsYk5Ch/z2eH+fZdl834MNY4B6UJ2u1Dec/sPefPZfpl4vFPyhM4hR oAAO4rx2CljknhRXoybKXEALqz0Mcjlc60Q3i3+XZdTyjU5XPIQpCt5AJwLW0NvmuTl6gL bGDAEZLWEWJtTuYjqwqhTWsseZgWZgQ= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-372-VlvcK9zbMZe7wNECLEo8QQ-1; Mon, 18 Nov 2024 03:37:53 -0500 X-MC-Unique: VlvcK9zbMZe7wNECLEo8QQ-1 X-Mimecast-MFC-AGG-ID: VlvcK9zbMZe7wNECLEo8QQ Received: from mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id C4CD419560B2; Mon, 18 Nov 2024 08:37:52 +0000 (UTC) Received: from corto.redhat.com (unknown [10.39.192.9]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E09771956054; Mon, 18 Nov 2024 08:37:45 +0000 (UTC) From: =?utf-8?q?C=C3=A9dric_Le_Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Zhenzhong Duan , Eric Auger Subject: [PULL 3/3] vfio/container: Fix container object destruction Date: Mon, 18 Nov 2024 09:37:37 +0100 Message-ID: <20241118083737.174219-4-clg@redhat.com> In-Reply-To: <20241118083737.174219-1-clg@redhat.com> References: <20241118083737.174219-1-clg@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.141, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_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 When commit 96b7af4388b3 intoduced a .instance_finalize() handler, it did not take into account that the container was not necessarily inserted into the container list of the address space. Hence, if the container object is destroyed, by calling object_unref() for example, before vfio_address_space_insert() is called, QEMU may crash when removing the container from the list as done in vfio_container_instance_finalize(). This was seen with an SEV-SNP guest for which discarding of RAM fails. To resolve this issue, use the safe version of QLIST_REMOVE(). Cc: Zhenzhong Duan Cc: Eric Auger Fixes: 96b7af4388b3 ("vfio/container: Move vfio_container_destroy() to an instance_finalize() handler") Reviewed-by: Zhenzhong Duan Signed-off-by: Cédric Le Goater --- hw/vfio/container-base.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/vfio/container-base.c b/hw/vfio/container-base.c index 809b15767425a48f2404b08fc409ee5684af2094..6f86c37d971ec38426dacd471bca837c0d0df806 100644 --- a/hw/vfio/container-base.c +++ b/hw/vfio/container-base.c @@ -103,7 +103,7 @@ static void vfio_container_instance_finalize(Object *obj) VFIOContainerBase *bcontainer = VFIO_IOMMU(obj); VFIOGuestIOMMU *giommu, *tmp; - QLIST_REMOVE(bcontainer, next); + QLIST_SAFE_REMOVE(bcontainer, next); QLIST_FOREACH_SAFE(giommu, &bcontainer->giommu_list, giommu_next, tmp) { memory_region_unregister_iommu_notifier(