From nobody Fri Oct 3 01:09:29 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D83102D6409; Tue, 9 Sep 2025 09:40:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757410804; cv=none; b=qzwCpjedTtuOVWazn3Be/BWuDRTazpg2W8+7HIXQ7hjR1Jda/ao40XmqHEiX8JExQq0ZWyQ3FuIzv8j5uV4ZJSb0opCxjTNjab1F97jciuW01ZG3+QAOnN0KPfidj9tuEw9NdyXMwdF/uhhQtxMoiSyJ+JyTa10cVaFVlFdFb3M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757410804; c=relaxed/simple; bh=VP1WTWQxCS9TlgJCKb39srQIObO767Az9EF/mk/4CHo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GB9zfLK1ERb73d/tqEfnO61V2jIcY2JhZ4/jwC3W4RBOP3PrUVQMhy0EIhlKGysZGm8e/MJHt32emBFKmnUDwEwZIiKvdOlpLc0Si/FmPnR3+c9lLl9IiPLAL3e7nFQx6PdUKTGzO4w35ecmgnR+GcIvxGl0vcbCQ0XPileE3pk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=hh45fLlz; arc=none smtp.client-ip=192.198.163.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hh45fLlz" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1757410802; x=1788946802; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VP1WTWQxCS9TlgJCKb39srQIObO767Az9EF/mk/4CHo=; b=hh45fLlzpM0RhQYHVsdxPf25Nwg8YWikdbgkizuLkoBVLyNYU/swu6nd G0vx5ompGMxwaI8xdgeJf5IyLBAcsDy5iUK7P0M47LIIZiT55CYgM58xF bzRuDFFA1qESSL0xvzWzLIlM5Iex0+zv2c+CHCr6y/OXrGW5uA9An2ZG1 4IQ/5AgubhN30L/58tx95z2tozG9hgizt/Kc6z72FFx1s7iC4OnGXNVOM zedtaxwTIGxf6AZNfxwzfR5OJZHNkUKqvGKeyOEH225clDjWgGf2QrZAW MqvBRQkBWHmsrZsqmI4PxQeTyPX9FCKxry7+QQcJToDAOqZuqo6Mzps8/ A==; X-CSE-ConnectionGUID: MGta7htzTXe/ITcovlOzbw== X-CSE-MsgGUID: fA7suPK5RJuz2JA1CoakEQ== X-IronPort-AV: E=McAfee;i="6800,10657,11547"; a="70307254" X-IronPort-AV: E=Sophos;i="6.18,251,1751266800"; d="scan'208";a="70307254" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2025 02:39:55 -0700 X-CSE-ConnectionGUID: 7w3l5ey9R++hR0k1hPWWAg== X-CSE-MsgGUID: 9wwOur5jT6i+eAk4YN+tcw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,251,1751266800"; d="scan'208";a="172207412" Received: from unknown (HELO CannotLeaveINTEL.jf.intel.com) ([10.165.54.94]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2025 02:39:56 -0700 From: Chao Gao To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: acme@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, john.allen@amd.com, mingo@kernel.org, mingo@redhat.com, minipli@grsecurity.net, mlevitsk@redhat.com, namhyung@kernel.org, pbonzini@redhat.com, prsampat@amd.com, rick.p.edgecombe@intel.com, seanjc@google.com, shuah@kernel.org, tglx@linutronix.de, weijiang.yang@intel.com, x86@kernel.org, xin@zytor.com, xiaoyao.li@intel.com Subject: [PATCH v14 09/22] KVM: VMX: Introduce CET VMCS fields and control bits Date: Tue, 9 Sep 2025 02:39:40 -0700 Message-ID: <20250909093953.202028-10-chao.gao@intel.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20250909093953.202028-1-chao.gao@intel.com> References: <20250909093953.202028-1-chao.gao@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yang Weijiang Control-flow Enforcement Technology (CET) is a kind of CPU feature used to prevent Return/CALL/Jump-Oriented Programming (ROP/COP/JOP) attacks. It provides two sub-features(SHSTK,IBT) to defend against ROP/COP/JOP style control-flow subversion attacks. Shadow Stack (SHSTK): A shadow stack is a second stack used exclusively for control transfer operations. The shadow stack is separate from the data/normal stack and can be enabled individually in user and kernel mode. When shadow stack is enabled, CALL pushes the return address on both the data and shadow stack. RET pops the return address from both stacks and compares them. If the return addresses from the two stacks do not match, the processor generates a #CP. Indirect Branch Tracking (IBT): IBT introduces instruction(ENDBRANCH)to mark valid target addresses of indirect branches (CALL, JMP etc...). If an indirect branch is executed and the next instruction is _not_ an ENDBRANCH, the processor generates a #CP. These instruction behaves as a NOP on platforms that have no CET. Several new CET MSRs are defined to support CET: MSR_IA32_{U,S}_CET: CET settings for {user,supervisor} CET respectively. MSR_IA32_PL{0,1,2,3}_SSP: SHSTK pointer linear address for CPL{0,1,2,3}. MSR_IA32_INT_SSP_TAB: Linear address of SHSTK pointer table, whose entry is indexed by IST of interrupt gate desc. Two XSAVES state bits are introduced for CET: IA32_XSS:[bit 11]: Control saving/restoring user mode CET states IA32_XSS:[bit 12]: Control saving/restoring supervisor mode CET states. Six VMCS fields are introduced for CET: {HOST,GUEST}_S_CET: Stores CET settings for kernel mode. {HOST,GUEST}_SSP: Stores current active SSP. {HOST,GUEST}_INTR_SSP_TABLE: Stores current active MSR_IA32_INT_SSP_TAB. On Intel platforms, two additional bits are defined in VM_EXIT and VM_ENTRY control fields: If VM_EXIT_LOAD_CET_STATE =3D 1, host CET states are loaded from following VMCS fields at VM-Exit: HOST_S_CET HOST_SSP HOST_INTR_SSP_TABLE If VM_ENTRY_LOAD_CET_STATE =3D 1, guest CET states are loaded from following VMCS fields at VM-Entry: GUEST_S_CET GUEST_SSP GUEST_INTR_SSP_TABLE Co-developed-by: Zhang Yi Z Signed-off-by: Zhang Yi Z Signed-off-by: Yang Weijiang Reviewed-by: Chao Gao Reviewed-by: Maxim Levitsky Tested-by: Mathias Krause Tested-by: John Allen Tested-by: Rick Edgecombe Signed-off-by: Chao Gao --- 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 cca7d6641287..ce10a7e2d3d9 100644 --- a/arch/x86/include/asm/vmx.h +++ b/arch/x86/include/asm/vmx.h @@ -106,6 +106,7 @@ #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_CET_STATE 0x10000000 =20 #define VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR 0x00036dff =20 @@ -119,6 +120,7 @@ #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_CET_STATE 0x00100000 =20 #define VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR 0x000011ff =20 @@ -369,6 +371,9 @@ enum vmcs_field { GUEST_PENDING_DBG_EXCEPTIONS =3D 0x00006822, GUEST_SYSENTER_ESP =3D 0x00006824, GUEST_SYSENTER_EIP =3D 0x00006826, + GUEST_S_CET =3D 0x00006828, + GUEST_SSP =3D 0x0000682a, + GUEST_INTR_SSP_TABLE =3D 0x0000682c, HOST_CR0 =3D 0x00006c00, HOST_CR3 =3D 0x00006c02, HOST_CR4 =3D 0x00006c04, @@ -381,6 +386,9 @@ enum vmcs_field { HOST_IA32_SYSENTER_EIP =3D 0x00006c12, HOST_RSP =3D 0x00006c14, HOST_RIP =3D 0x00006c16, + HOST_S_CET =3D 0x00006c18, + HOST_SSP =3D 0x00006c1a, + HOST_INTR_SSP_TABLE =3D 0x00006c1c }; =20 /* --=20 2.47.3