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 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 select KVM_BOOK3S_PR_POSSIBLE 109 help 110 Support running guest kernels in virtual machines on processors 111 without using hypervisor mode in the host, by running the 112 guest in user mode (problem state) and emulating all 113 privileged instructions and registers. 114 115 This is not as fast as using hypervisor mode, but works on 116 machines where hypervisor mode is not available or not usable, 117 and can emulate processors that are different from the host 118 processor, including emulating 32-bit processors on a 64-bit 119 host. 120 121config KVM_BOOK3S_HV_EXIT_TIMING 122 bool "Detailed timing for hypervisor real-mode code" 123 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 124 help 125 Calculate time taken for each vcpu in the real-mode guest entry, 126 exit, and interrupt handling code, plus time spent in the guest 127 and in nap mode due to idle (cede) while other threads are still 128 in the guest. The total, minimum and maximum times in nanoseconds 129 together with the number of executions are reported in debugfs in 130 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 131 ns per exit on POWER8. 132 133 If unsure, say N. 134 135config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND 136 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT 137 depends on KVM_BOOK3S_HV_POSSIBLE 138 default !EXPERT 139 help 140 Old nested HV capable Linux guests have a bug where they don't 141 reflect the PMU in-use status of their L2 guest to the L0 host 142 while the L2 PMU registers are live. This can result in loss 143 of L2 PMU register state, causing perf to not work correctly in 144 L2 guests. 145 146 Selecting this option for the L0 host implements a workaround for 147 those buggy L1s which saves the L2 state, at the cost of performance 148 in all nested-capable guest entry/exit. 149 150config KVM_BOOKE_HV 151 bool 152 153config KVM_EXIT_TIMING 154 bool "Detailed exit timing" 155 depends on KVM_E500V2 || KVM_E500MC 156 help 157 Calculate elapsed time for every exit/enter cycle. A per-vcpu 158 report is available in debugfs kvm/vm#_vcpu#_timing. 159 The overhead is relatively small, however it is not recommended for 160 production environments. 161 162 If unsure, say N. 163 164config KVM_E500V2 165 bool "KVM support for PowerPC E500v2 processors" 166 depends on E500 && !PPC_E500MC 167 select KVM 168 select KVM_MMIO 169 select MMU_NOTIFIER 170 help 171 Support running unmodified E500 guest kernels in virtual machines on 172 E500v2 host processors. 173 174 This module provides access to the hardware capabilities through 175 a character device node named /dev/kvm. 176 177 If unsure, say N. 178 179config KVM_E500MC 180 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 181 depends on PPC_E500MC 182 select KVM 183 select KVM_MMIO 184 select KVM_BOOKE_HV 185 select MMU_NOTIFIER 186 help 187 Support running unmodified E500MC/E5500/E6500 guest kernels in 188 virtual machines on E500MC/E5500/E6500 host processors. 189 190 This module provides access to the hardware capabilities through 191 a character device node named /dev/kvm. 192 193 If unsure, say N. 194 195config KVM_MPIC 196 bool "KVM in-kernel MPIC emulation" 197 depends on KVM && E500 198 select HAVE_KVM_IRQCHIP 199 select HAVE_KVM_IRQFD 200 select HAVE_KVM_IRQ_ROUTING 201 select HAVE_KVM_MSI 202 help 203 Enable support for emulating MPIC devices inside the 204 host kernel, rather than relying on userspace to emulate. 205 Currently, support is limited to certain versions of 206 Freescale's MPIC implementation. 207 208config KVM_XICS 209 bool "KVM in-kernel XICS emulation" 210 depends on KVM_BOOK3S_64 && !KVM_MPIC 211 select HAVE_KVM_IRQCHIP 212 select HAVE_KVM_IRQFD 213 default y 214 help 215 Include support for the XICS (eXternal Interrupt Controller 216 Specification) interrupt controller architecture used on 217 IBM POWER (pSeries) servers. 218 219config KVM_XIVE 220 bool 221 default y 222 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE 223 224endif # VIRTUALIZATION 225