1# SPDX-License-Identifier: GPL-2.0 2# 3# KVM configuration 4# 5 6source "virt/kvm/Kconfig" 7 8menuconfig VIRTUALIZATION 9 bool "Virtualization" 10 help 11 Say Y here to get to see options for using your Linux host to run 12 other operating systems inside virtual machines (guests). 13 This option alone does not add any kernel code. 14 15 If you say N, all options in this submenu will be skipped and 16 disabled. 17 18if VIRTUALIZATION 19 20config KVM 21 bool 22 select KVM_COMMON 23 select KVM_VFIO 24 select HAVE_KVM_IRQ_BYPASS 25 26config KVM_BOOK3S_HANDLER 27 bool 28 29config KVM_BOOK3S_32_HANDLER 30 bool 31 select KVM_BOOK3S_HANDLER 32 select KVM_MMIO 33 34config KVM_BOOK3S_64_HANDLER 35 bool 36 select KVM_BOOK3S_HANDLER 37 38config KVM_BOOK3S_PR_POSSIBLE 39 bool 40 select KVM_MMIO 41 select KVM_GENERIC_MMU_NOTIFIER 42 43config KVM_BOOK3S_HV_POSSIBLE 44 bool 45 46config KVM_BOOK3S_32 47 tristate "KVM support for PowerPC book3s_32 processors" 48 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT 49 depends on !CONTEXT_TRACKING_USER 50 select KVM 51 select KVM_BOOK3S_32_HANDLER 52 select KVM_BOOK3S_PR_POSSIBLE 53 select PPC_FPU 54 help 55 Support running unmodified book3s_32 guest kernels 56 in virtual machines on book3s_32 host processors. 57 58 This module provides access to the hardware capabilities through 59 a character device node named /dev/kvm. 60 61 If unsure, say N. 62 63config KVM_BOOK3S_64 64 tristate "KVM support for PowerPC book3s_64 processors" 65 depends on PPC_BOOK3S_64 66 select KVM_BOOK3S_64_HANDLER 67 select KVM 68 select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE 69 select PPC_64S_HASH_MMU 70 select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV) 71 help 72 Support running unmodified book3s_64 and book3s_32 guest kernels 73 in virtual machines on book3s_64 host processors. 74 75 This module provides access to the hardware capabilities through 76 a character device node named /dev/kvm. 77 78 If unsure, say N. 79 80config KVM_BOOK3S_64_HV 81 tristate "KVM for POWER7 and later using hypervisor mode in host" 82 depends on KVM_BOOK3S_64 && PPC_POWERNV 83 select KVM_BOOK3S_HV_POSSIBLE 84 select KVM_GENERIC_MMU_NOTIFIER 85 select KVM_BOOK3S_HV_PMU 86 select CMA 87 help 88 Support running unmodified book3s_64 guest kernels in 89 virtual machines on POWER7 and newer processors that have 90 hypervisor mode available to the host. 91 92 If you say Y here, KVM will use the hardware virtualization 93 facilities of POWER7 (and later) processors, meaning that 94 guest operating systems will run at full hardware speed 95 using supervisor and user modes. However, this also means 96 that KVM is not usable under PowerVM (pHyp), is only usable 97 on POWER7 or later processors, and cannot emulate a 98 different processor from the host processor. 99 100 If unsure, say N. 101 102config KVM_BOOK3S_64_PR 103 tristate "KVM support without using hypervisor mode in host" 104 depends on KVM_BOOK3S_64 105 depends on !CONTEXT_TRACKING_USER 106 select KVM_BOOK3S_PR_POSSIBLE 107 help 108 Support running guest kernels in virtual machines on processors 109 without using hypervisor mode in the host, by running the 110 guest in user mode (problem state) and emulating all 111 privileged instructions and registers. 112 113 This is only available for hash MMU mode and only supports 114 guests that use hash MMU mode. 115 116 This is not as fast as using hypervisor mode, but works on 117 machines where hypervisor mode is not available or not usable, 118 and can emulate processors that are different from the host 119 processor, including emulating 32-bit processors on a 64-bit 120 host. 121 122 Selecting this option will cause the SCV facility to be 123 disabled when the kernel is booted on the pseries platform in 124 hash MMU mode (regardless of PR VMs running). When any PR VMs 125 are running, "AIL" mode is disabled which may slow interrupts 126 and system calls on the host. 127 128config KVM_BOOK3S_HV_EXIT_TIMING 129 bool 130 131config KVM_BOOK3S_HV_P9_TIMING 132 bool "Detailed timing for the P9 entry point" 133 select KVM_BOOK3S_HV_EXIT_TIMING 134 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 135 help 136 Calculate time taken for each vcpu during vcpu entry and 137 exit, time spent inside the guest and time spent handling 138 hypercalls and page faults. The total, minimum and maximum 139 times in nanoseconds together with the number of executions 140 are reported in debugfs in kvm/vm#/vcpu#/timings. 141 142 If unsure, say N. 143 144config KVM_BOOK3S_HV_P8_TIMING 145 bool "Detailed timing for hypervisor real-mode code (for POWER8)" 146 select KVM_BOOK3S_HV_EXIT_TIMING 147 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING 148 help 149 Calculate time taken for each vcpu in the real-mode guest entry, 150 exit, and interrupt handling code, plus time spent in the guest 151 and in nap mode due to idle (cede) while other threads are still 152 in the guest. The total, minimum and maximum times in nanoseconds 153 together with the number of executions are reported in debugfs in 154 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 155 ns per exit on POWER8. 156 157 If unsure, say N. 158 159config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND 160 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT 161 depends on KVM_BOOK3S_HV_POSSIBLE 162 default !EXPERT 163 help 164 Old nested HV capable Linux guests have a bug where they don't 165 reflect the PMU in-use status of their L2 guest to the L0 host 166 while the L2 PMU registers are live. This can result in loss 167 of L2 PMU register state, causing perf to not work correctly in 168 L2 guests. 169 170 Selecting this option for the L0 host implements a workaround for 171 those buggy L1s which saves the L2 state, at the cost of performance 172 in all nested-capable guest entry/exit. 173 174config KVM_BOOK3S_HV_PMU 175 tristate "Hypervisor Perf events for KVM Book3s-HV" 176 depends on KVM_BOOK3S_64_HV 177 help 178 Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These 179 Perf events give an overview of hypervisor performance overall 180 instead of a specific guests. Currently the PMU reports 181 L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like: 182 * Total/Used Guest-Heap 183 * Total/Used Guest Page-table Memory 184 * Total amount of Guest Page-table Memory reclaimed 185 186config KVM_BOOKE_HV 187 bool 188 189config KVM_EXIT_TIMING 190 bool "Detailed exit timing" 191 depends on KVM_E500V2 || KVM_E500MC 192 help 193 Calculate elapsed time for every exit/enter cycle. A per-vcpu 194 report is available in debugfs kvm/vm#_vcpu#_timing. 195 The overhead is relatively small, however it is not recommended for 196 production environments. 197 198 If unsure, say N. 199 200config KVM_E500V2 201 bool "KVM support for PowerPC E500v2 processors" 202 depends on PPC_E500 && !PPC_E500MC 203 depends on !CONTEXT_TRACKING_USER 204 select KVM 205 select KVM_MMIO 206 select KVM_GENERIC_MMU_NOTIFIER 207 help 208 Support running unmodified E500 guest kernels in virtual machines on 209 E500v2 host processors. 210 211 This module provides access to the hardware capabilities through 212 a character device node named /dev/kvm. 213 214 If unsure, say N. 215 216config KVM_E500MC 217 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 218 depends on PPC_E500MC 219 depends on !CONTEXT_TRACKING_USER 220 select KVM 221 select KVM_MMIO 222 select KVM_BOOKE_HV 223 select KVM_GENERIC_MMU_NOTIFIER 224 help 225 Support running unmodified E500MC/E5500/E6500 guest kernels in 226 virtual machines on E500MC/E5500/E6500 host processors. 227 228 This module provides access to the hardware capabilities through 229 a character device node named /dev/kvm. 230 231 If unsure, say N. 232 233config KVM_MPIC 234 bool "KVM in-kernel MPIC emulation" 235 depends on KVM && PPC_E500 236 select HAVE_KVM_IRQCHIP 237 select HAVE_KVM_IRQ_ROUTING 238 select HAVE_KVM_MSI 239 help 240 Enable support for emulating MPIC devices inside the 241 host kernel, rather than relying on userspace to emulate. 242 Currently, support is limited to certain versions of 243 Freescale's MPIC implementation. 244 245config KVM_XICS 246 bool "KVM in-kernel XICS emulation" 247 depends on KVM_BOOK3S_64 && !KVM_MPIC 248 select HAVE_KVM_IRQCHIP 249 default y 250 help 251 Include support for the XICS (eXternal Interrupt Controller 252 Specification) interrupt controller architecture used on 253 IBM POWER (pSeries) servers. 254 255config KVM_XIVE 256 bool 257 default y 258 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE 259 260endif # VIRTUALIZATION 261