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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 4E448C072A4 for ; Wed, 22 May 2019 07:02:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2D3D020863 for ; Wed, 22 May 2019 07:02:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728527AbfEVHB5 (ORCPT ); Wed, 22 May 2019 03:01:57 -0400 Received: from mga18.intel.com ([134.134.136.126]:31984 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726552AbfEVHB4 (ORCPT ); Wed, 22 May 2019 03:01:56 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 22 May 2019 00:01:56 -0700 X-ExtLoop1: 1 Received: from local-michael-cet-test.sh.intel.com ([10.239.159.128]) by fmsmga001.fm.intel.com with ESMTP; 22 May 2019 00:01:54 -0700 From: Yang Weijiang To: pbonzini@redhat.com, sean.j.christopherson@intel.com, mst@redhat.com, rkrcmar@redhat.com, jmattson@google.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, yu-cheng.yu@intel.com Cc: weijiang.yang@intel.com Subject: [PATCH v5 1/8] KVM: VMX: Define CET VMCS fields and control bits Date: Wed, 22 May 2019 15:00:54 +0800 Message-Id: <20190522070101.7636-2-weijiang.yang@intel.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190522070101.7636-1-weijiang.yang@intel.com> References: <20190522070101.7636-1-weijiang.yang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org CET(Control-flow Enforcement Technology) is an upcoming Intel® processor family feature that blocks return/jump-oriented programming (ROP) attacks. It provides the following capabilities to defend against ROP/JOP style control-flow subversion attacks: - Shadow Stack (SHSTK): A second stack for the program that is used exclusively for control transfer operations. - Indirect Branch Tracking (IBT): Free branch protection to defend against jump/call oriented programming. Several new CET MSRs are defined in kernel to support CET: MSR_IA32_{U,S}_CET - MSRs to control the CET settings for user mode and suervisor mode respectively. MSR_IA32_PL{0,1,2,3}_SSP - MSRs to store shadow stack pointers for CPL-0,1,2,3 levels. MSR_IA32_INT_SSP_TAB - MSR to store base address of shadow stack pointer table. Two XSAVES state components are introduced for CET: IA32_XSS:[bit 11] - bit for save/restor user mode CET states IA32_XSS:[bit 12] - bit for save/restor supervisor mode CET states. 6 VMCS fields are introduced for CET, {HOST,GUEST}_S_CET is to store CET settings in supervisor mode. {HOST,GUEST}_SSP is to store shadow stack pointers in supervisor mode. {HOST,GUEST}_INTR_SSP_TABLE is to store base address of shadow stack pointer table. If VM_EXIT_LOAD_HOST_CET_STATE = 1, the host's CET MSRs are restored from below VMCS fields at VM-Exit: - HOST_S_CET - HOST_SSP - HOST_INTR_SSP_TABLE If VM_ENTRY_LOAD_GUEST_CET_STATE = 1, the guest's CET MSRs are loaded from below VMCS fields at VM-Entry: - GUEST_S_CET - GUEST_SSP - GUEST_INTR_SSP_TABLE Apart from VMCS auto-load fields, KVM calls kvm_load_guest_fpu() and kvm_put_guest_fpu() to save/restore the guest CET MSR states at VM exit/entry. XSAVES/XRSTORS are executed underneath these functions if they are supported. The CET xsave area is consolidated with other XSAVE components in thread_struct.fpu field. When context switch happens during task switch/interrupt/exception etc., Kernel also relies on above functions to switch CET states properly. Signed-off-by: Yang Weijiang Co-developed-by: Zhang Yi Z --- arch/x86/include/asm/vmx.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h index 4e4133e86484..d84804c7ddaa 100644 --- a/arch/x86/include/asm/vmx.h +++ b/arch/x86/include/asm/vmx.h @@ -103,6 +103,7 @@ #define VM_EXIT_CLEAR_BNDCFGS 0x00800000 #define VM_EXIT_PT_CONCEAL_PIP 0x01000000 #define VM_EXIT_CLEAR_IA32_RTIT_CTL 0x02000000 +#define VM_EXIT_LOAD_HOST_CET_STATE 0x10000000 #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR 0x00036dff @@ -116,6 +117,7 @@ #define VM_ENTRY_LOAD_BNDCFGS 0x00010000 #define VM_ENTRY_PT_CONCEAL_PIP 0x00020000 #define VM_ENTRY_LOAD_IA32_RTIT_CTL 0x00040000 +#define VM_ENTRY_LOAD_GUEST_CET_STATE 0x00100000 #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR 0x000011ff @@ -334,6 +336,9 @@ enum vmcs_field { GUEST_PENDING_DBG_EXCEPTIONS = 0x00006822, GUEST_SYSENTER_ESP = 0x00006824, GUEST_SYSENTER_EIP = 0x00006826, + GUEST_S_CET = 0x00006828, + GUEST_SSP = 0x0000682a, + GUEST_INTR_SSP_TABLE = 0x0000682c, HOST_CR0 = 0x00006c00, HOST_CR3 = 0x00006c02, HOST_CR4 = 0x00006c04, @@ -346,6 +351,9 @@ enum vmcs_field { HOST_IA32_SYSENTER_EIP = 0x00006c12, HOST_RSP = 0x00006c14, HOST_RIP = 0x00006c16, + HOST_S_CET = 0x00006c18, + HOST_SSP = 0x00006c1a, + HOST_INTR_SSP_TABLE = 0x00006c1c }; /* -- 2.17.2