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