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