1# SPDX-License-Identifier: GPL-2.0 2# 3# KVM configuration 4# 5 6source "virt/kvm/Kconfig" 7 8menuconfig VIRTUALIZATION 9 bool "Virtualization" 10 depends on HAVE_KVM || X86 11 default y 12 help 13 Say Y here to get to see options for using your Linux host to run other 14 operating systems inside virtual machines (guests). 15 This option alone does not add any kernel code. 16 17 If you say N, all options in this submenu will be skipped and disabled. 18 19if VIRTUALIZATION 20 21config KVM 22 tristate "Kernel-based Virtual Machine (KVM) support" 23 depends on HAVE_KVM 24 depends on HIGH_RES_TIMERS 25 depends on X86_LOCAL_APIC 26 select KVM_COMMON 27 select KVM_GENERIC_MMU_NOTIFIER 28 select HAVE_KVM_IRQCHIP 29 select HAVE_KVM_PFNCACHE 30 select HAVE_KVM_DIRTY_RING_TSO 31 select HAVE_KVM_DIRTY_RING_ACQ_REL 32 select IRQ_BYPASS_MANAGER 33 select HAVE_KVM_IRQ_BYPASS 34 select HAVE_KVM_IRQ_ROUTING 35 select KVM_ASYNC_PF 36 select USER_RETURN_NOTIFIER 37 select KVM_MMIO 38 select SCHED_INFO 39 select PERF_EVENTS 40 select GUEST_PERF_EVENTS 41 select HAVE_KVM_MSI 42 select HAVE_KVM_CPU_RELAX_INTERCEPT 43 select HAVE_KVM_NO_POLL 44 select KVM_XFER_TO_GUEST_WORK 45 select KVM_GENERIC_DIRTYLOG_READ_PROTECT 46 select KVM_VFIO 47 select HAVE_KVM_PM_NOTIFIER if PM 48 select KVM_GENERIC_HARDWARE_ENABLING 49 help 50 Support hosting fully virtualized guest machines using hardware 51 virtualization extensions. You will need a fairly recent 52 processor equipped with virtualization extensions. You will also 53 need to select one or more of the processor modules below. 54 55 This module provides access to the hardware capabilities through 56 a character device node named /dev/kvm. 57 58 To compile this as a module, choose M here: the module 59 will be called kvm. 60 61 If unsure, say N. 62 63config KVM_WERROR 64 bool "Compile KVM with -Werror" 65 # Disallow KVM's -Werror if KASAN is enabled, e.g. to guard against 66 # randomized configs from selecting KVM_WERROR=y, which doesn't play 67 # nice with KASAN. KASAN builds generates warnings for the default 68 # FRAME_WARN, i.e. KVM_WERROR=y with KASAN=y requires special tuning. 69 # Building KVM with -Werror and KASAN is still doable via enabling 70 # the kernel-wide WERROR=y. 71 depends on KVM && EXPERT && !KASAN 72 help 73 Add -Werror to the build flags for KVM. 74 75 If in doubt, say "N". 76 77config KVM_SW_PROTECTED_VM 78 bool "Enable support for KVM software-protected VMs" 79 depends on EXPERT 80 depends on KVM && X86_64 81 select KVM_GENERIC_PRIVATE_MEM 82 help 83 Enable support for KVM software-protected VMs. Currently "protected" 84 means the VM can be backed with memory provided by 85 KVM_CREATE_GUEST_MEMFD. 86 87 If unsure, say "N". 88 89config KVM_INTEL 90 tristate "KVM for Intel (and compatible) processors support" 91 depends on KVM && IA32_FEAT_CTL 92 help 93 Provides support for KVM on processors equipped with Intel's VT 94 extensions, a.k.a. Virtual Machine Extensions (VMX). 95 96 To compile this as a module, choose M here: the module 97 will be called kvm-intel. 98 99config X86_SGX_KVM 100 bool "Software Guard eXtensions (SGX) Virtualization" 101 depends on X86_SGX && KVM_INTEL 102 help 103 104 Enables KVM guests to create SGX enclaves. 105 106 This includes support to expose "raw" unreclaimable enclave memory to 107 guests via a device node, e.g. /dev/sgx_vepc. 108 109 If unsure, say N. 110 111config KVM_AMD 112 tristate "KVM for AMD processors support" 113 depends on KVM && (CPU_SUP_AMD || CPU_SUP_HYGON) 114 help 115 Provides support for KVM on AMD processors equipped with the AMD-V 116 (SVM) extensions. 117 118 To compile this as a module, choose M here: the module 119 will be called kvm-amd. 120 121config KVM_AMD_SEV 122 def_bool y 123 bool "AMD Secure Encrypted Virtualization (SEV) support" 124 depends on KVM_AMD && X86_64 125 depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m) 126 help 127 Provides support for launching Encrypted VMs (SEV) and Encrypted VMs 128 with Encrypted State (SEV-ES) on AMD processors. 129 130config KVM_SMM 131 bool "System Management Mode emulation" 132 default y 133 depends on KVM 134 help 135 Provides support for KVM to emulate System Management Mode (SMM) 136 in virtual machines. This can be used by the virtual machine 137 firmware to implement UEFI secure boot. 138 139 If unsure, say Y. 140 141config KVM_HYPERV 142 bool "Support for Microsoft Hyper-V emulation" 143 depends on KVM 144 default y 145 help 146 Provides KVM support for emulating Microsoft Hyper-V. This allows KVM 147 to expose a subset of the paravirtualized interfaces defined in the 148 Hyper-V Hypervisor Top-Level Functional Specification (TLFS): 149 https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs 150 These interfaces are required for the correct and performant functioning 151 of Windows and Hyper-V guests on KVM. 152 153 If unsure, say "Y". 154 155config KVM_XEN 156 bool "Support for Xen hypercall interface" 157 depends on KVM 158 help 159 Provides KVM support for the hosting Xen HVM guests and 160 passing Xen hypercalls to userspace. 161 162 If in doubt, say "N". 163 164config KVM_PROVE_MMU 165 bool "Prove KVM MMU correctness" 166 depends on DEBUG_KERNEL 167 depends on KVM 168 depends on EXPERT 169 help 170 Enables runtime assertions in KVM's MMU that are too costly to enable 171 in anything remotely resembling a production environment, e.g. this 172 gates code that verifies a to-be-freed page table doesn't have any 173 present SPTEs. 174 175 If in doubt, say "N". 176 177config KVM_EXTERNAL_WRITE_TRACKING 178 bool 179 180config KVM_MAX_NR_VCPUS 181 int "Maximum number of vCPUs per KVM guest" 182 depends on KVM 183 range 1024 4096 184 default 4096 if MAXSMP 185 default 1024 186 help 187 Set the maximum number of vCPUs per KVM guest. Larger values will increase 188 the memory footprint of each KVM guest, regardless of how many vCPUs are 189 created for a given VM. 190 191endif # VIRTUALIZATION 192