1 # SPDX-License-Identifier: GPL-2.0
6 source "virt/kvm/Kconfig"
8 menuconfig VIRTUALIZATION
10 depends on HAVE_KVM || X86
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.
17 If you say N, all options in this submenu will be skipped and disabled.
22 tristate "Kernel-based Virtual Machine (KVM) support"
24 depends on HIGH_RES_TIMERS
25 depends on X86_LOCAL_APIC
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
36 select USER_RETURN_NOTIFIER
40 select GUEST_PERF_EVENTS
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
47 select HAVE_KVM_PM_NOTIFIER if PM
48 select KVM_GENERIC_HARDWARE_ENABLING
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.
55 This module provides access to the hardware capabilities through
56 a character device node named /dev/kvm.
58 To compile this as a module, choose M here: the module
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
73 Add -Werror to the build flags for KVM.
77 config KVM_SW_PROTECTED_VM
78 bool "Enable support for KVM software-protected VMs"
80 depends on KVM && X86_64
81 select KVM_GENERIC_PRIVATE_MEM
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.
90 tristate "KVM for Intel (and compatible) processors support"
91 depends on KVM && IA32_FEAT_CTL
93 Provides support for KVM on processors equipped with Intel's VT
94 extensions, a.k.a. Virtual Machine Extensions (VMX).
96 To compile this as a module, choose M here: the module
97 will be called kvm-intel.
100 bool "Software Guard eXtensions (SGX) Virtualization"
101 depends on X86_SGX && KVM_INTEL
104 Enables KVM guests to create SGX enclaves.
106 This includes support to expose "raw" unreclaimable enclave memory to
107 guests via a device node, e.g. /dev/sgx_vepc.
112 tristate "KVM for AMD processors support"
113 depends on KVM && (CPU_SUP_AMD || CPU_SUP_HYGON)
115 Provides support for KVM on AMD processors equipped with the AMD-V
118 To compile this as a module, choose M here: the module
119 will be called kvm-amd.
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)
127 Provides support for launching Encrypted VMs (SEV) and Encrypted VMs
128 with Encrypted State (SEV-ES) on AMD processors.
131 bool "System Management Mode emulation"
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.
142 bool "Support for Microsoft Hyper-V emulation"
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.
156 bool "Support for Xen hypercall interface"
159 Provides KVM support for the hosting Xen HVM guests and
160 passing Xen hypercalls to userspace.
162 If in doubt, say "N".
165 bool "Prove KVM MMU correctness"
166 depends on DEBUG_KERNEL
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
175 If in doubt, say "N".
177 config KVM_EXTERNAL_WRITE_TRACKING
180 config KVM_MAX_NR_VCPUS
181 int "Maximum number of vCPUs per KVM guest"
184 default 4096 if MAXSMP
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.
191 endif # VIRTUALIZATION