1 # SPDX-License-Identifier: GPL-2.0 2 # 3 # KVM configuration 4 # 5 6 source "virt/kvm/Kconfig" 7 8 menuconfig 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 18 if VIRTUALIZATION 19 20 config 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 27 config KVM_BOOK3S_HANDLER 28 bool 29 30 config KVM_BOOK3S_32_HANDLER 31 bool 32 select KVM_BOOK3S_HANDLER 33 select KVM_MMIO 34 35 config KVM_BOOK3S_64_HANDLER 36 bool 37 select KVM_BOOK3S_HANDLER 38 39 config KVM_BOOK3S_PR_POSSIBLE 40 bool 41 select KVM_MMIO 42 select KVM_GENERIC_MMU_NOTIFIER 43 44 config KVM_BOOK3S_HV_POSSIBLE 45 bool 46 47 config 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 64 config 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 81 config 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 CMA 87 help 88 Support running unmodified book3s_64 guest kernels in 89 virtual machines on POWER7 and newer processors that have 90 hypervisor mode available to the host. 91 92 If you say Y here, KVM will use the hardware virtualization 93 facilities of POWER7 (and later) processors, meaning that 94 guest operating systems will run at full hardware speed 95 using supervisor and user modes. However, this also means 96 that KVM is not usable under PowerVM (pHyp), is only usable 97 on POWER7 or later processors, and cannot emulate a 98 different processor from the host processor. 99 100 If unsure, say N. 101 102 config KVM_BOOK3S_64_PR 103 tristate "KVM support without using hypervisor mode in host" 104 depends on KVM_BOOK3S_64 105 depends on !CONTEXT_TRACKING_USER 106 select KVM_BOOK3S_PR_POSSIBLE 107 help 108 Support running guest kernels in virtual machines on processors 109 without using hypervisor mode in the host, by running the 110 guest in user mode (problem state) and emulating all 111 privileged instructions and registers. 112 113 This is only available for hash MMU mode and only supports 114 guests that use hash MMU mode. 115 116 This is not as fast as using hypervisor mode, but works on 117 machines where hypervisor mode is not available or not usable, 118 and can emulate processors that are different from the host 119 processor, including emulating 32-bit processors on a 64-bit 120 host. 121 122 Selecting this option will cause the SCV facility to be 123 disabled when the kernel is booted on the pseries platform in 124 hash MMU mode (regardless of PR VMs running). When any PR VMs 125 are running, "AIL" mode is disabled which may slow interrupts 126 and system calls on the host. 127 128 config KVM_BOOK3S_HV_EXIT_TIMING 129 bool 130 131 config KVM_BOOK3S_HV_P9_TIMING 132 bool "Detailed timing for the P9 entry point" 133 select KVM_BOOK3S_HV_EXIT_TIMING 134 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 135 help 136 Calculate time taken for each vcpu during vcpu entry and 137 exit, time spent inside the guest and time spent handling 138 hypercalls and page faults. The total, minimum and maximum 139 times in nanoseconds together with the number of executions 140 are reported in debugfs in kvm/vm#/vcpu#/timings. 141 142 If unsure, say N. 143 144 config KVM_BOOK3S_HV_P8_TIMING 145 bool "Detailed timing for hypervisor real-mode code (for POWER8)" 146 select KVM_BOOK3S_HV_EXIT_TIMING 147 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING 148 help 149 Calculate time taken for each vcpu in the real-mode guest entry, 150 exit, and interrupt handling code, plus time spent in the guest 151 and in nap mode due to idle (cede) while other threads are still 152 in the guest. The total, minimum and maximum times in nanoseconds 153 together with the number of executions are reported in debugfs in 154 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 155 ns per exit on POWER8. 156 157 If unsure, say N. 158 159 config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND 160 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT 161 depends on KVM_BOOK3S_HV_POSSIBLE 162 default !EXPERT 163 help 164 Old nested HV capable Linux guests have a bug where they don't 165 reflect the PMU in-use status of their L2 guest to the L0 host 166 while the L2 PMU registers are live. This can result in loss 167 of L2 PMU register state, causing perf to not work correctly in 168 L2 guests. 169 170 Selecting this option for the L0 host implements a workaround for 171 those buggy L1s which saves the L2 state, at the cost of performance 172 in all nested-capable guest entry/exit. 173 174 config KVM_BOOKE_HV 175 bool 176 177 config KVM_EXIT_TIMING 178 bool "Detailed exit timing" 179 depends on KVM_E500V2 || KVM_E500MC 180 help 181 Calculate elapsed time for every exit/enter cycle. A per-vcpu 182 report is available in debugfs kvm/vm#_vcpu#_timing. 183 The overhead is relatively small, however it is not recommended for 184 production environments. 185 186 If unsure, say N. 187 188 config KVM_E500V2 189 bool "KVM support for PowerPC E500v2 processors" 190 depends on PPC_E500 && !PPC_E500MC 191 depends on !CONTEXT_TRACKING_USER 192 select KVM 193 select KVM_MMIO 194 select KVM_GENERIC_MMU_NOTIFIER 195 help 196 Support running unmodified E500 guest kernels in virtual machines on 197 E500v2 host processors. 198 199 This module provides access to the hardware capabilities through 200 a character device node named /dev/kvm. 201 202 If unsure, say N. 203 204 config KVM_E500MC 205 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 206 depends on PPC_E500MC 207 depends on !CONTEXT_TRACKING_USER 208 select KVM 209 select KVM_MMIO 210 select KVM_BOOKE_HV 211 select KVM_GENERIC_MMU_NOTIFIER 212 help 213 Support running unmodified E500MC/E5500/E6500 guest kernels in 214 virtual machines on E500MC/E5500/E6500 host processors. 215 216 This module provides access to the hardware capabilities through 217 a character device node named /dev/kvm. 218 219 If unsure, say N. 220 221 config KVM_MPIC 222 bool "KVM in-kernel MPIC emulation" 223 depends on KVM && PPC_E500 224 select HAVE_KVM_IRQCHIP 225 select HAVE_KVM_IRQ_ROUTING 226 select HAVE_KVM_MSI 227 help 228 Enable support for emulating MPIC devices inside the 229 host kernel, rather than relying on userspace to emulate. 230 Currently, support is limited to certain versions of 231 Freescale's MPIC implementation. 232 233 config KVM_XICS 234 bool "KVM in-kernel XICS emulation" 235 depends on KVM_BOOK3S_64 && !KVM_MPIC 236 select HAVE_KVM_IRQCHIP 237 default y 238 help 239 Include support for the XICS (eXternal Interrupt Controller 240 Specification) interrupt controller architecture used on 241 IBM POWER (pSeries) servers. 242 243 config KVM_XIVE 244 bool 245 default y 246 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE 247 248 endif # VIRTUALIZATION 249