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