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