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 X-Spam-Level: X-Spam-Status: No, score=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67448C4338F for ; Tue, 10 Aug 2021 18:07:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4DA426044F for ; Tue, 10 Aug 2021 18:07:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237881AbhHJSID (ORCPT ); Tue, 10 Aug 2021 14:08:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:38806 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238876AbhHJSEe (ORCPT ); Tue, 10 Aug 2021 14:04:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 50C8A6140F; Tue, 10 Aug 2021 17:48:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1628617704; bh=/JrhBX0ziRnLbtewtunYKUMLWwn5i7XYGX4vXtnNh4I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M5ch7chLlDG3B0iCzUte/46KodeLYfiV+cAZbel/ijeek5QbOyurztcxq5Kpr4F83 ndzjX5Q54Fsp48cm4YCkU9ZC2NUSAvWPv3Y0I3Q4rB0RGdT1kkQTFmxIIs1swCwO0C iRr4Mso79qxAEnl8VXgcL4eF7alIOEaRb4WuVTvA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Shuo Liu , Fei Li Subject: [PATCH 5.13 133/175] virt: acrn: Do hcall_destroy_vm() before resource release Date: Tue, 10 Aug 2021 19:30:41 +0200 Message-Id: <20210810173005.326442924@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210810173000.928681411@linuxfoundation.org> References: <20210810173000.928681411@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Shuo Liu commit 4c4c1257b844ffe5d0933684e612f92c4b78e120 upstream. The ACRN hypervisor has scenarios which could run a real-time guest VM. The real-time guest VM occupies dedicated CPU cores, be assigned with dedicated PCI devices. It can run without the Service VM after boot up. hcall_destroy_vm() returns failure when a real-time guest VM refuses. The clearing of flag ACRN_VM_FLAG_DESTROYED causes some kernel resource double-freed in a later acrn_vm_destroy(). Do hcall_destroy_vm() before resource release to drop this chance to destroy the VM if hypercall fails. Fixes: 9c5137aedd11 ("virt: acrn: Introduce VM management interfaces") Cc: stable Signed-off-by: Shuo Liu Signed-off-by: Fei Li Link: https://lore.kernel.org/r/20210722062736.15050-1-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/virt/acrn/vm.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) --- a/drivers/virt/acrn/vm.c +++ b/drivers/virt/acrn/vm.c @@ -64,6 +64,14 @@ int acrn_vm_destroy(struct acrn_vm *vm) test_and_set_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags)) return 0; + ret = hcall_destroy_vm(vm->vmid); + if (ret < 0) { + dev_err(acrn_dev.this_device, + "Failed to destroy VM %u\n", vm->vmid); + clear_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags); + return ret; + } + /* Remove from global VM list */ write_lock_bh(&acrn_vm_list_lock); list_del_init(&vm->list); @@ -78,14 +86,6 @@ int acrn_vm_destroy(struct acrn_vm *vm) vm->monitor_page = NULL; } - ret = hcall_destroy_vm(vm->vmid); - if (ret < 0) { - dev_err(acrn_dev.this_device, - "Failed to destroy VM %u\n", vm->vmid); - clear_bit(ACRN_VM_FLAG_DESTROYED, &vm->flags); - return ret; - } - acrn_vm_all_ram_unmap(vm); dev_dbg(acrn_dev.this_device, "VM %u destroyed.\n", vm->vmid);