From patchwork Wed Nov 8 18:29:58 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 742452 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 224A2C0018C for ; Wed, 8 Nov 2023 19:00:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232745AbjKHTAj (ORCPT ); Wed, 8 Nov 2023 14:00:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232749AbjKHTAb (ORCPT ); Wed, 8 Nov 2023 14:00:31 -0500 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F30612132; Wed, 8 Nov 2023 11:00:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1699470026; x=1731006026; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ukS+/b5BwUHCj+QqTdfJhuP2WcGpUwcg7AQHZyyo+p8=; b=m4G+UnkAQRoNu38+P1kCKjofAFVvUV6r0FiYU935R73M8WSEqnr5UJ6V v63xRYU/pJMC1zzA24/oeD+bmCwc5sM0imvFcOmTj7JsL/1CO3qAGOwmr FZipAswXLEJNdhyWP4Ioz2Uay+nv/Itv78aZpDvypYxJOfxIiBaATMGCg LVNJtx0KMUlRBHgs/XXfuTMXkJjUkzNm64NZAG2IicHdDajB3DAGpqms1 p9OWqONJeB1vqu9dp4DN6Ttt4f92jhYcuWKWrTDOg0YOctq26qjuQon1a fYbqjfNJXMIJIQhvagS2f4ZQ82ZomIcMwfN2ftPYlH33pSyTuL9MMMe06 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10888"; a="8486422" X-IronPort-AV: E=Sophos;i="6.03,287,1694761200"; d="scan'208";a="8486422" Received: from orviesa001.jf.intel.com ([10.64.159.141]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Nov 2023 11:00:26 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,287,1694761200"; d="scan'208";a="10892498" Received: from unknown (HELO fred..) ([172.25.112.68]) by orviesa001.jf.intel.com with ESMTP; 08 Nov 2023 11:00:25 -0800 From: Xin Li To: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, corbet@lwn.net, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, vkuznets@redhat.com, peterz@infradead.org, ravi.v.shankar@intel.com Subject: [PATCH v1 18/23] KVM: nVMX: Add VMCS FRED states checking Date: Wed, 8 Nov 2023 10:29:58 -0800 Message-ID: <20231108183003.5981-19-xin3.li@intel.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231108183003.5981-1-xin3.li@intel.com> References: <20231108183003.5981-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add FRED related VMCS fields checkings. As real hardware, nested VMX performs checks on various VMCS fields, including both controls and guest/host states. With the introduction of VMX FRED, add FRED related VMCS fields checkings. Tested-by: Shan Kang Signed-off-by: Xin Li --- arch/x86/kvm/vmx/nested.c | 70 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 69 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index b85cd5c0ec98..bbfa09d575d3 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -2940,6 +2940,7 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) { struct vcpu_vmx *vmx = to_vmx(vcpu); + bool fred_enabled = !!(vmcs12->guest_cr4 & X86_CR4_FRED); if (CC(!vmx_control_verify(vmcs12->vm_entry_controls, vmx->nested.msrs.entry_ctls_low, @@ -2958,6 +2959,7 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu, u32 intr_type = intr_info & INTR_INFO_INTR_TYPE_MASK; bool has_error_code = intr_info & INTR_INFO_DELIVER_CODE_MASK; bool should_have_error_code; + bool has_nested_exception = vmx->nested.msrs.basic & VMX_BASIC_NESTED_EXCEPTION; bool urg = nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST); bool prot_mode = !urg || vmcs12->guest_cr0 & X86_CR0_PE; @@ -2971,7 +2973,9 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu, /* VM-entry interruption-info field: vector */ if (CC(intr_type == INTR_TYPE_NMI_INTR && vector != NMI_VECTOR) || CC(intr_type == INTR_TYPE_HARD_EXCEPTION && vector > 31) || - CC(intr_type == INTR_TYPE_OTHER_EVENT && vector != 0)) + CC(intr_type == INTR_TYPE_OTHER_EVENT && + ((!fred_enabled && vector > 0) || + (fred_enabled && vector > 2)))) return -EINVAL; /* VM-entry interruption-info field: deliver error code */ @@ -2990,6 +2994,15 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu, if (CC(intr_info & INTR_INFO_RESVD_BITS_MASK)) return -EINVAL; + /* + * When the CPU enumerates VMX nested-exception support, bit 13 + * (set to indicate a nested exception) of the intr info field + * may have value 1. Otherwise the bit 13 is reserved. + */ + if (CC(!has_nested_exception && + (intr_info & INTR_INFO_NESTED_EXCEPTION_MASK))) + return -EINVAL; + /* VM-entry instruction length */ switch (intr_type) { case INTR_TYPE_SOFT_EXCEPTION: @@ -2999,6 +3012,12 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu, CC(vmcs12->vm_entry_instruction_len == 0 && CC(!nested_cpu_has_zero_length_injection(vcpu)))) return -EINVAL; + break; + case INTR_TYPE_OTHER_EVENT: + if (fred_enabled && (vector == 1 || vector == 2)) + if (CC(vmcs12->vm_entry_instruction_len > 15)) + return -EINVAL; + break; } } @@ -3056,14 +3075,31 @@ static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu, vmcs12->host_ia32_perf_global_ctrl))) return -EINVAL; + /* Host FRED state checking */ if (ia32e) { if (CC(!(vmcs12->host_cr4 & X86_CR4_PAE))) return -EINVAL; + if (vmcs12->vm_exit_controls & VM_EXIT_ACTIVATE_SECONDARY_CONTROLS && + vmcs12->secondary_vm_exit_controls & SECONDARY_VM_EXIT_LOAD_IA32_FRED) { + /* Bit 2, bits 5:4, and bit 11 of the IA32_FRED_CONFIG must be zero */ + if (CC(vmcs12->host_ia32_fred_config & 0x834) || + CC(vmcs12->host_ia32_fred_rsp1 & 0x3F) || + CC(vmcs12->host_ia32_fred_rsp2 & 0x3F) || + CC(vmcs12->host_ia32_fred_rsp3 & 0x3F)) + return -EINVAL; + if (CC(is_noncanonical_address(vmcs12->host_ia32_fred_config & ~0xFFFULL, vcpu)) || + CC(is_noncanonical_address(vmcs12->host_ia32_fred_rsp1, vcpu)) || + CC(is_noncanonical_address(vmcs12->host_ia32_fred_rsp2, vcpu)) || + CC(is_noncanonical_address(vmcs12->host_ia32_fred_rsp3, vcpu))) + return -EINVAL; + } } else { if (CC(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) || CC(vmcs12->host_cr4 & X86_CR4_PCIDE) || CC((vmcs12->host_rip) >> 32)) return -EINVAL; + if (CC(vmcs12->host_cr4 & X86_CR4_FRED)) + return -EINVAL; } if (CC(vmcs12->host_cs_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) || @@ -3205,6 +3241,38 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu, CC((vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)))) return -EINVAL; + /* Guest FRED state checking */ + if (ia32e) { + if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_FRED) { + /* Bit 2, bits 5:4, and bit 11 of the IA32_FRED_CONFIG must be zero */ + if (CC(vmcs12->guest_ia32_fred_config & 0x834) || + CC(vmcs12->guest_ia32_fred_rsp1 & 0x3F) || + CC(vmcs12->guest_ia32_fred_rsp2 & 0x3F) || + CC(vmcs12->guest_ia32_fred_rsp3 & 0x3F)) + return -EINVAL; + if (CC(is_noncanonical_address(vmcs12->guest_ia32_fred_config & ~0xFFFULL, vcpu)) || + CC(is_noncanonical_address(vmcs12->guest_ia32_fred_rsp1, vcpu)) || + CC(is_noncanonical_address(vmcs12->guest_ia32_fred_rsp2, vcpu)) || + CC(is_noncanonical_address(vmcs12->guest_ia32_fred_rsp3, vcpu))) + return -EINVAL; + } + if (vmcs12->guest_cr4 & X86_CR4_FRED) { + unsigned int ss_dpl = VMX_AR_DPL(vmcs12->guest_ss_ar_bytes); + if (CC(ss_dpl == 1 || ss_dpl == 2)) + return -EINVAL; + if (ss_dpl == 0 && + CC(!(vmcs12->guest_cs_ar_bytes & VMX_AR_L_MASK))) + return -EINVAL; + if (ss_dpl == 3 && + (CC(vmcs12->guest_rflags & X86_EFLAGS_IOPL) || + CC(vmcs12->guest_interruptibility_info & GUEST_INTR_STATE_STI))) + return -EINVAL; + } + } else { + if (CC(vmcs12->guest_cr4 & X86_CR4_FRED)) + return -EINVAL; + } + if (nested_check_guest_non_reg_state(vmcs12)) return -EINVAL;