1# 2# KVM configuration 3# 4 5source "virt/kvm/Kconfig" 6 7menuconfig VIRTUALIZATION 8 bool "Virtualization" 9 ---help--- 10 Say Y here to get to see options for using your Linux host to run 11 other operating systems inside virtual machines (guests). 12 This option alone does not add any kernel code. 13 14 If you say N, all options in this submenu will be skipped and 15 disabled. 16 17if VIRTUALIZATION 18 19config KVM 20 bool 21 select PREEMPT_NOTIFIERS 22 select ANON_INODES 23 select HAVE_KVM_EVENTFD 24 select SRCU 25 select KVM_VFIO 26 select IRQ_BYPASS_MANAGER 27 select HAVE_KVM_IRQ_BYPASS 28 29config KVM_BOOK3S_HANDLER 30 bool 31 32config KVM_BOOK3S_32_HANDLER 33 bool 34 select KVM_BOOK3S_HANDLER 35 select KVM_MMIO 36 37config KVM_BOOK3S_64_HANDLER 38 bool 39 select KVM_BOOK3S_HANDLER 40 41config KVM_BOOK3S_PR_POSSIBLE 42 bool 43 select KVM_MMIO 44 select MMU_NOTIFIER 45 46config KVM_BOOK3S_HV_POSSIBLE 47 bool 48 49config KVM_BOOK3S_32 50 tristate "KVM support for PowerPC book3s_32 processors" 51 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT 52 select KVM 53 select KVM_BOOK3S_32_HANDLER 54 select KVM_BOOK3S_PR_POSSIBLE 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 64config 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 ---help--- 71 Support running unmodified book3s_64 and book3s_32 guest kernels 72 in virtual machines on book3s_64 host processors. 73 74 This module provides access to the hardware capabilities through 75 a character device node named /dev/kvm. 76 77 If unsure, say N. 78 79config KVM_BOOK3S_64_HV 80 tristate "KVM for POWER7 and later using hypervisor mode in host" 81 depends on KVM_BOOK3S_64 && PPC_POWERNV 82 select KVM_BOOK3S_HV_POSSIBLE 83 select MMU_NOTIFIER 84 select CMA 85 ---help--- 86 Support running unmodified book3s_64 guest kernels in 87 virtual machines on POWER7 and newer processors that have 88 hypervisor mode available to the host. 89 90 If you say Y here, KVM will use the hardware virtualization 91 facilities of POWER7 (and later) processors, meaning that 92 guest operating systems will run at full hardware speed 93 using supervisor and user modes. However, this also means 94 that KVM is not usable under PowerVM (pHyp), is only usable 95 on POWER7 or later processors, and cannot emulate a 96 different processor from the host processor. 97 98 If unsure, say N. 99 100config KVM_BOOK3S_64_PR 101 tristate "KVM support without using hypervisor mode in host" 102 depends on KVM_BOOK3S_64 103 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 not as fast as using hypervisor mode, but works on 111 machines where hypervisor mode is not available or not usable, 112 and can emulate processors that are different from the host 113 processor, including emulating 32-bit processors on a 64-bit 114 host. 115 116config KVM_BOOK3S_HV_EXIT_TIMING 117 bool "Detailed timing for hypervisor real-mode code" 118 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 119 ---help--- 120 Calculate time taken for each vcpu in the real-mode guest entry, 121 exit, and interrupt handling code, plus time spent in the guest 122 and in nap mode due to idle (cede) while other threads are still 123 in the guest. The total, minimum and maximum times in nanoseconds 124 together with the number of executions are reported in debugfs in 125 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 126 ns per exit on POWER8. 127 128 If unsure, say N. 129 130config KVM_BOOKE_HV 131 bool 132 133config KVM_EXIT_TIMING 134 bool "Detailed exit timing" 135 depends on KVM_E500V2 || KVM_E500MC 136 ---help--- 137 Calculate elapsed time for every exit/enter cycle. A per-vcpu 138 report is available in debugfs kvm/vm#_vcpu#_timing. 139 The overhead is relatively small, however it is not recommended for 140 production environments. 141 142 If unsure, say N. 143 144config KVM_E500V2 145 bool "KVM support for PowerPC E500v2 processors" 146 depends on E500 && !PPC_E500MC 147 select KVM 148 select KVM_MMIO 149 select MMU_NOTIFIER 150 ---help--- 151 Support running unmodified E500 guest kernels in virtual machines on 152 E500v2 host processors. 153 154 This module provides access to the hardware capabilities through 155 a character device node named /dev/kvm. 156 157 If unsure, say N. 158 159config KVM_E500MC 160 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 161 depends on PPC_E500MC 162 select KVM 163 select KVM_MMIO 164 select KVM_BOOKE_HV 165 select MMU_NOTIFIER 166 ---help--- 167 Support running unmodified E500MC/E5500/E6500 guest kernels in 168 virtual machines on E500MC/E5500/E6500 host processors. 169 170 This module provides access to the hardware capabilities through 171 a character device node named /dev/kvm. 172 173 If unsure, say N. 174 175config KVM_MPIC 176 bool "KVM in-kernel MPIC emulation" 177 depends on KVM && E500 178 select HAVE_KVM_IRQCHIP 179 select HAVE_KVM_IRQFD 180 select HAVE_KVM_IRQ_ROUTING 181 select HAVE_KVM_MSI 182 help 183 Enable support for emulating MPIC devices inside the 184 host kernel, rather than relying on userspace to emulate. 185 Currently, support is limited to certain versions of 186 Freescale's MPIC implementation. 187 188config KVM_XICS 189 bool "KVM in-kernel XICS emulation" 190 depends on KVM_BOOK3S_64 && !KVM_MPIC 191 select HAVE_KVM_IRQCHIP 192 select HAVE_KVM_IRQFD 193 default y 194 ---help--- 195 Include support for the XICS (eXternal Interrupt Controller 196 Specification) interrupt controller architecture used on 197 IBM POWER (pSeries) servers. 198 199source drivers/vhost/Kconfig 200 201endif # VIRTUALIZATION 202