0001 # SPDX-License-Identifier: GPL-2.0
0002 #
0003 # KVM configuration
0004 #
0005
0006 source "virt/kvm/Kconfig"
0007
0008 menuconfig VIRTUALIZATION
0009 bool "Virtualization"
0010 help
0011 Say Y here to get to see options for using your Linux host to run
0012 other operating systems inside virtual machines (guests).
0013 This option alone does not add any kernel code.
0014
0015 If you say N, all options in this submenu will be skipped and
0016 disabled.
0017
0018 if VIRTUALIZATION
0019
0020 config KVM
0021 bool
0022 select PREEMPT_NOTIFIERS
0023 select HAVE_KVM_EVENTFD
0024 select HAVE_KVM_VCPU_ASYNC_IOCTL
0025 select SRCU
0026 select KVM_VFIO
0027 select IRQ_BYPASS_MANAGER
0028 select HAVE_KVM_IRQ_BYPASS
0029 select INTERVAL_TREE
0030
0031 config KVM_BOOK3S_HANDLER
0032 bool
0033
0034 config KVM_BOOK3S_32_HANDLER
0035 bool
0036 select KVM_BOOK3S_HANDLER
0037 select KVM_MMIO
0038
0039 config KVM_BOOK3S_64_HANDLER
0040 bool
0041 select KVM_BOOK3S_HANDLER
0042
0043 config KVM_BOOK3S_PR_POSSIBLE
0044 bool
0045 select KVM_MMIO
0046 select MMU_NOTIFIER
0047
0048 config KVM_BOOK3S_HV_POSSIBLE
0049 bool
0050
0051 config KVM_BOOK3S_32
0052 tristate "KVM support for PowerPC book3s_32 processors"
0053 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
0054 select KVM
0055 select KVM_BOOK3S_32_HANDLER
0056 select KVM_BOOK3S_PR_POSSIBLE
0057 select PPC_FPU
0058 help
0059 Support running unmodified book3s_32 guest kernels
0060 in virtual machines on book3s_32 host processors.
0061
0062 This module provides access to the hardware capabilities through
0063 a character device node named /dev/kvm.
0064
0065 If unsure, say N.
0066
0067 config KVM_BOOK3S_64
0068 tristate "KVM support for PowerPC book3s_64 processors"
0069 depends on PPC_BOOK3S_64
0070 select KVM_BOOK3S_64_HANDLER
0071 select KVM
0072 select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE
0073 select PPC_64S_HASH_MMU
0074 select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV)
0075 help
0076 Support running unmodified book3s_64 and book3s_32 guest kernels
0077 in virtual machines on book3s_64 host processors.
0078
0079 This module provides access to the hardware capabilities through
0080 a character device node named /dev/kvm.
0081
0082 If unsure, say N.
0083
0084 config KVM_BOOK3S_64_HV
0085 tristate "KVM for POWER7 and later using hypervisor mode in host"
0086 depends on KVM_BOOK3S_64 && PPC_POWERNV
0087 select KVM_BOOK3S_HV_POSSIBLE
0088 select MMU_NOTIFIER
0089 select CMA
0090 help
0091 Support running unmodified book3s_64 guest kernels in
0092 virtual machines on POWER7 and newer processors that have
0093 hypervisor mode available to the host.
0094
0095 If you say Y here, KVM will use the hardware virtualization
0096 facilities of POWER7 (and later) processors, meaning that
0097 guest operating systems will run at full hardware speed
0098 using supervisor and user modes. However, this also means
0099 that KVM is not usable under PowerVM (pHyp), is only usable
0100 on POWER7 or later processors, and cannot emulate a
0101 different processor from the host processor.
0102
0103 If unsure, say N.
0104
0105 config KVM_BOOK3S_64_PR
0106 tristate "KVM support without using hypervisor mode in host"
0107 depends on KVM_BOOK3S_64
0108 select KVM_BOOK3S_PR_POSSIBLE
0109 help
0110 Support running guest kernels in virtual machines on processors
0111 without using hypervisor mode in the host, by running the
0112 guest in user mode (problem state) and emulating all
0113 privileged instructions and registers.
0114
0115 This is only available for hash MMU mode and only supports
0116 guests that use hash MMU mode.
0117
0118 This is not as fast as using hypervisor mode, but works on
0119 machines where hypervisor mode is not available or not usable,
0120 and can emulate processors that are different from the host
0121 processor, including emulating 32-bit processors on a 64-bit
0122 host.
0123
0124 Selecting this option will cause the SCV facility to be
0125 disabled when the kernel is booted on the pseries platform in
0126 hash MMU mode (regardless of PR VMs running). When any PR VMs
0127 are running, "AIL" mode is disabled which may slow interrupts
0128 and system calls on the host.
0129
0130 config KVM_BOOK3S_HV_EXIT_TIMING
0131 bool
0132
0133 config KVM_BOOK3S_HV_P9_TIMING
0134 bool "Detailed timing for the P9 entry point"
0135 select KVM_BOOK3S_HV_EXIT_TIMING
0136 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
0137 help
0138 Calculate time taken for each vcpu during vcpu entry and
0139 exit, time spent inside the guest and time spent handling
0140 hypercalls and page faults. The total, minimum and maximum
0141 times in nanoseconds together with the number of executions
0142 are reported in debugfs in kvm/vm#/vcpu#/timings.
0143
0144 If unsure, say N.
0145
0146 config KVM_BOOK3S_HV_P8_TIMING
0147 bool "Detailed timing for hypervisor real-mode code (for POWER8)"
0148 select KVM_BOOK3S_HV_EXIT_TIMING
0149 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING
0150 help
0151 Calculate time taken for each vcpu in the real-mode guest entry,
0152 exit, and interrupt handling code, plus time spent in the guest
0153 and in nap mode due to idle (cede) while other threads are still
0154 in the guest. The total, minimum and maximum times in nanoseconds
0155 together with the number of executions are reported in debugfs in
0156 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40
0157 ns per exit on POWER8.
0158
0159 If unsure, say N.
0160
0161 config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
0162 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT
0163 depends on KVM_BOOK3S_HV_POSSIBLE
0164 default !EXPERT
0165 help
0166 Old nested HV capable Linux guests have a bug where they don't
0167 reflect the PMU in-use status of their L2 guest to the L0 host
0168 while the L2 PMU registers are live. This can result in loss
0169 of L2 PMU register state, causing perf to not work correctly in
0170 L2 guests.
0171
0172 Selecting this option for the L0 host implements a workaround for
0173 those buggy L1s which saves the L2 state, at the cost of performance
0174 in all nested-capable guest entry/exit.
0175
0176 config KVM_BOOKE_HV
0177 bool
0178
0179 config KVM_EXIT_TIMING
0180 bool "Detailed exit timing"
0181 depends on KVM_E500V2 || KVM_E500MC
0182 help
0183 Calculate elapsed time for every exit/enter cycle. A per-vcpu
0184 report is available in debugfs kvm/vm#_vcpu#_timing.
0185 The overhead is relatively small, however it is not recommended for
0186 production environments.
0187
0188 If unsure, say N.
0189
0190 config KVM_E500V2
0191 bool "KVM support for PowerPC E500v2 processors"
0192 depends on E500 && !PPC_E500MC
0193 select KVM
0194 select KVM_MMIO
0195 select MMU_NOTIFIER
0196 help
0197 Support running unmodified E500 guest kernels in virtual machines on
0198 E500v2 host processors.
0199
0200 This module provides access to the hardware capabilities through
0201 a character device node named /dev/kvm.
0202
0203 If unsure, say N.
0204
0205 config KVM_E500MC
0206 bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
0207 depends on PPC_E500MC
0208 select KVM
0209 select KVM_MMIO
0210 select KVM_BOOKE_HV
0211 select MMU_NOTIFIER
0212 help
0213 Support running unmodified E500MC/E5500/E6500 guest kernels in
0214 virtual machines on E500MC/E5500/E6500 host processors.
0215
0216 This module provides access to the hardware capabilities through
0217 a character device node named /dev/kvm.
0218
0219 If unsure, say N.
0220
0221 config KVM_MPIC
0222 bool "KVM in-kernel MPIC emulation"
0223 depends on KVM && E500
0224 select HAVE_KVM_IRQCHIP
0225 select HAVE_KVM_IRQFD
0226 select HAVE_KVM_IRQ_ROUTING
0227 select HAVE_KVM_MSI
0228 help
0229 Enable support for emulating MPIC devices inside the
0230 host kernel, rather than relying on userspace to emulate.
0231 Currently, support is limited to certain versions of
0232 Freescale's MPIC implementation.
0233
0234 config KVM_XICS
0235 bool "KVM in-kernel XICS emulation"
0236 depends on KVM_BOOK3S_64 && !KVM_MPIC
0237 select HAVE_KVM_IRQCHIP
0238 select HAVE_KVM_IRQFD
0239 default y
0240 help
0241 Include support for the XICS (eXternal Interrupt Controller
0242 Specification) interrupt controller architecture used on
0243 IBM POWER (pSeries) servers.
0244
0245 config KVM_XIVE
0246 bool
0247 default y
0248 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
0249
0250 endif # VIRTUALIZATION
