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 HAVE_KVM_VCPU_ASYNC_IOCTL 24 select KVM_VFIO 25 select HAVE_KVM_IRQ_BYPASS 26 27config KVM_BOOK3S_HANDLER 28 bool 29 30config KVM_BOOK3S_32_HANDLER 31 bool 32 select KVM_BOOK3S_HANDLER 33 select KVM_MMIO 34 35config KVM_BOOK3S_64_HANDLER 36 bool 37 select KVM_BOOK3S_HANDLER 38 39config KVM_BOOK3S_PR_POSSIBLE 40 bool 41 select KVM_MMIO 42 select KVM_GENERIC_MMU_NOTIFIER 43 44config KVM_BOOK3S_HV_POSSIBLE 45 bool 46 47config KVM_BOOK3S_32 48 tristate "KVM support for PowerPC book3s_32 processors" 49 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT 50 depends on !CONTEXT_TRACKING_USER 51 select KVM 52 select KVM_BOOK3S_32_HANDLER 53 select KVM_BOOK3S_PR_POSSIBLE 54 select PPC_FPU 55 help 56 Support running unmodified book3s_32 guest kernels 57 in virtual machines on book3s_32 host processors. 58 59 This module provides access to the hardware capabilities through 60 a character device node named /dev/kvm. 61 62 If unsure, say N. 63 64config KVM_BOOK3S_64 65 tristate "KVM support for PowerPC book3s_64 processors" 66 depends on PPC_BOOK3S_64 67 select KVM_BOOK3S_64_HANDLER 68 select KVM 69 select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE 70 select PPC_64S_HASH_MMU 71 select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV) 72 help 73 Support running unmodified book3s_64 and book3s_32 guest kernels 74 in virtual machines on book3s_64 host processors. 75 76 This module provides access to the hardware capabilities through 77 a character device node named /dev/kvm. 78 79 If unsure, say N. 80 81config KVM_BOOK3S_64_HV 82 tristate "KVM for POWER7 and later using hypervisor mode in host" 83 depends on KVM_BOOK3S_64 && PPC_POWERNV 84 select KVM_BOOK3S_HV_POSSIBLE 85 select KVM_GENERIC_MMU_NOTIFIER 86 select KVM_BOOK3S_HV_PMU 87 select CMA 88 help 89 Support running unmodified book3s_64 guest kernels in 90 virtual machines on POWER7 and newer processors that have 91 hypervisor mode available to the host. 92 93 If you say Y here, KVM will use the hardware virtualization 94 facilities of POWER7 (and later) processors, meaning that 95 guest operating systems will run at full hardware speed 96 using supervisor and user modes. However, this also means 97 that KVM is not usable under PowerVM (pHyp), is only usable 98 on POWER7 or later processors, and cannot emulate a 99 different processor from the host processor. 100 101 If unsure, say N. 102 103config KVM_BOOK3S_64_PR 104 tristate "KVM support without using hypervisor mode in host" 105 depends on KVM_BOOK3S_64 106 depends on !CONTEXT_TRACKING_USER 107 select KVM_BOOK3S_PR_POSSIBLE 108 help 109 Support running guest kernels in virtual machines on processors 110 without using hypervisor mode in the host, by running the 111 guest in user mode (problem state) and emulating all 112 privileged instructions and registers. 113 114 This is only available for hash MMU mode and only supports 115 guests that use hash MMU mode. 116 117 This is not as fast as using hypervisor mode, but works on 118 machines where hypervisor mode is not available or not usable, 119 and can emulate processors that are different from the host 120 processor, including emulating 32-bit processors on a 64-bit 121 host. 122 123 Selecting this option will cause the SCV facility to be 124 disabled when the kernel is booted on the pseries platform in 125 hash MMU mode (regardless of PR VMs running). When any PR VMs 126 are running, "AIL" mode is disabled which may slow interrupts 127 and system calls on the host. 128 129config KVM_BOOK3S_HV_EXIT_TIMING 130 bool 131 132config KVM_BOOK3S_HV_P9_TIMING 133 bool "Detailed timing for the P9 entry point" 134 select KVM_BOOK3S_HV_EXIT_TIMING 135 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 136 help 137 Calculate time taken for each vcpu during vcpu entry and 138 exit, time spent inside the guest and time spent handling 139 hypercalls and page faults. The total, minimum and maximum 140 times in nanoseconds together with the number of executions 141 are reported in debugfs in kvm/vm#/vcpu#/timings. 142 143 If unsure, say N. 144 145config KVM_BOOK3S_HV_P8_TIMING 146 bool "Detailed timing for hypervisor real-mode code (for POWER8)" 147 select KVM_BOOK3S_HV_EXIT_TIMING 148 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING 149 help 150 Calculate time taken for each vcpu in the real-mode guest entry, 151 exit, and interrupt handling code, plus time spent in the guest 152 and in nap mode due to idle (cede) while other threads are still 153 in the guest. The total, minimum and maximum times in nanoseconds 154 together with the number of executions are reported in debugfs in 155 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 156 ns per exit on POWER8. 157 158 If unsure, say N. 159 160config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND 161 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT 162 depends on KVM_BOOK3S_HV_POSSIBLE 163 default !EXPERT 164 help 165 Old nested HV capable Linux guests have a bug where they don't 166 reflect the PMU in-use status of their L2 guest to the L0 host 167 while the L2 PMU registers are live. This can result in loss 168 of L2 PMU register state, causing perf to not work correctly in 169 L2 guests. 170 171 Selecting this option for the L0 host implements a workaround for 172 those buggy L1s which saves the L2 state, at the cost of performance 173 in all nested-capable guest entry/exit. 174 175config KVM_BOOK3S_HV_PMU 176 tristate "Hypervisor Perf events for KVM Book3s-HV" 177 depends on KVM_BOOK3S_64_HV 178 help 179 Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These 180 Perf events give an overview of hypervisor performance overall 181 instead of a specific guests. Currently the PMU reports 182 L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like: 183 * Total/Used Guest-Heap 184 * Total/Used Guest Page-table Memory 185 * Total amount of Guest Page-table Memory reclaimed 186 187config KVM_BOOKE_HV 188 bool 189 190config KVM_EXIT_TIMING 191 bool "Detailed exit timing" 192 depends on KVM_E500V2 || KVM_E500MC 193 help 194 Calculate elapsed time for every exit/enter cycle. A per-vcpu 195 report is available in debugfs kvm/vm#_vcpu#_timing. 196 The overhead is relatively small, however it is not recommended for 197 production environments. 198 199 If unsure, say N. 200 201config KVM_E500V2 202 bool "KVM support for PowerPC E500v2 processors" 203 depends on PPC_E500 && !PPC_E500MC 204 depends on !CONTEXT_TRACKING_USER 205 select KVM 206 select KVM_MMIO 207 select KVM_GENERIC_MMU_NOTIFIER 208 help 209 Support running unmodified E500 guest kernels in virtual machines on 210 E500v2 host processors. 211 212 This module provides access to the hardware capabilities through 213 a character device node named /dev/kvm. 214 215 If unsure, say N. 216 217config KVM_E500MC 218 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 219 depends on PPC_E500MC 220 depends on !CONTEXT_TRACKING_USER 221 select KVM 222 select KVM_MMIO 223 select KVM_BOOKE_HV 224 select KVM_GENERIC_MMU_NOTIFIER 225 help 226 Support running unmodified E500MC/E5500/E6500 guest kernels in 227 virtual machines on E500MC/E5500/E6500 host processors. 228 229 This module provides access to the hardware capabilities through 230 a character device node named /dev/kvm. 231 232 If unsure, say N. 233 234config KVM_MPIC 235 bool "KVM in-kernel MPIC emulation" 236 depends on KVM && PPC_E500 237 select HAVE_KVM_IRQCHIP 238 select HAVE_KVM_IRQ_ROUTING 239 select HAVE_KVM_MSI 240 help 241 Enable support for emulating MPIC devices inside the 242 host kernel, rather than relying on userspace to emulate. 243 Currently, support is limited to certain versions of 244 Freescale's MPIC implementation. 245 246config KVM_XICS 247 bool "KVM in-kernel XICS emulation" 248 depends on KVM_BOOK3S_64 && !KVM_MPIC 249 select HAVE_KVM_IRQCHIP 250 default y 251 help 252 Include support for the XICS (eXternal Interrupt Controller 253 Specification) interrupt controller architecture used on 254 IBM POWER (pSeries) servers. 255 256config KVM_XIVE 257 bool 258 default y 259 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE 260 261endif # VIRTUALIZATION 262