From patchwork Thu Mar 10 08:39:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chenyi Qiang X-Patchwork-Id: 12776031 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E6D7C433EF for ; Thu, 10 Mar 2022 08:34:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240389AbiCJIfI (ORCPT ); Thu, 10 Mar 2022 03:35:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57010 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240359AbiCJIfH (ORCPT ); Thu, 10 Mar 2022 03:35:07 -0500 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0942C5BE58; Thu, 10 Mar 2022 00:34:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646901246; x=1678437246; h=from:to:cc:subject:date:message-id; bh=nz5FzexQmq7xmux0Vn9kIxPKVazZKup2wF1i2KERivk=; b=ihjvRKREeBn6xQYTMuahJyIqhLfwHMjYERNMrgfGYhxK8hDrmGBbe0AP u33nN2O15BN9LT60fHyIjlTY8MqLF5FW9EO5QoigdCPCD7XekmW0mVEJr 69kOFd4M1V3OSsShTgatqrlnRfm3Rw9UWabRNT4ejY+PBKBEkfnTicF0f pUBnd1aSfIcAwtW9WGCtRQUJkx92nKqrsKhDZSyBqsiLzEreeed/tj/d+ 9vRifD5KSlS2kE06FZJgSPSdoDXqO68h5c7b76kTfrZal2UHFMmPN2L4G 1PpbXan/a5fctush6l4oLj86VW4vqH3fydP2OWmP5A+Fb1S7ydzjytjGq A==; X-IronPort-AV: E=McAfee;i="6200,9189,10281"; a="235800117" X-IronPort-AV: E=Sophos;i="5.90,169,1643702400"; d="scan'208";a="235800117" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2022 00:34:06 -0800 X-IronPort-AV: E=Sophos;i="5.90,169,1643702400"; d="scan'208";a="513891422" Received: from chenyi-pc.sh.intel.com ([10.239.159.73]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Mar 2022 00:34:04 -0800 From: Chenyi Qiang To: Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Xiaoyao Li Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/3] Introduce Notify VM exit Date: Thu, 10 Mar 2022 16:39:58 +0800 Message-Id: <20220310084001.10235-1-chenyi.qiang@intel.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Virtual machines can exploit Intel ISA characterstics to cause functional denial of service to the VMM. This series introduces a new feature named Notify VM exit, which can help mitigate such kind of attack. Patch 1: An extension of KVM_SET_VCPU_EVENTS ioctl to inject a synthesized shutdown event from user space. Patch 2: The main patch to enable Notify VM exit. Patch 3: Add document about the new KVM capability and KVM exit reason. --- Change logs: v3 -> v4 - Change this feature to per-VM scope. (Jim) - Once VM_CONTEXT_INVALID set in exit_qualification, exit to user space notify this fatal case, especially the notify VM exit happens in L2. (Jim) - extend KVM_SET_VCPU_EVENTS to allow user space to inject a shutdown event. (Jim) - A minor code changes. - Add document for the new KVM capability. - v3: https://lore.kernel.org/lkml/20220223062412.22334-1-chenyi.qiang@intel.com/ v2 -> v3 - add a vcpu state notify_window_exits to record the number of occurence as well as a pr_warn output. (Sean) - Add the handling in nested VM to prevent L1 bypassing the restriction through launching a L2. (Sean) - Only kill L2 when L2 VM is context invalid, synthesize a EXIT_REASON_TRIPLE_FAULT to L1 (Sean) - To ease the current implementation, make module parameter notify_window read-only. (Sean) - Disable notify window exit by default. - v2: https://lore.kernel.org/lkml/20210525051204.1480610-1-tao3.xu@intel.com/ v1 -> v2 - Default set notify window to 0, less than 0 to disable. - Add more description in commit message. --- Chenyi Qiang (2): KVM: X86: Extend KVM_SET_VCPU_EVENTS to inject a SHUTDOWN event KVM: Add document for KVM_CAP_X86_NOTIFY_VMEXIT and KVM_EXIT_NOTIFY Tao Xu (1): KVM: VMX: Enable Notify VM exit Documentation/virt/kvm/api.rst | 42 ++++++++++++++++++++++++++++ arch/x86/include/asm/kvm_host.h | 5 ++++ arch/x86/include/asm/vmx.h | 7 +++++ arch/x86/include/asm/vmxfeatures.h | 1 + arch/x86/include/uapi/asm/kvm.h | 1 + arch/x86/include/uapi/asm/vmx.h | 4 ++- arch/x86/kvm/vmx/capabilities.h | 6 ++++ arch/x86/kvm/vmx/nested.c | 17 +++++++++++- arch/x86/kvm/vmx/vmx.c | 44 ++++++++++++++++++++++++++++-- arch/x86/kvm/x86.c | 25 +++++++++++++++-- arch/x86/kvm/x86.h | 5 ++++ include/uapi/linux/kvm.h | 7 +++++ 12 files changed, 156 insertions(+), 8 deletions(-)