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 26config KVM_BOOK3S_HANDLER 27 bool 28 29config KVM_BOOK3S_32_HANDLER 30 bool 31 select KVM_BOOK3S_HANDLER 32 select KVM_MMIO 33 34config KVM_BOOK3S_64_HANDLER 35 bool 36 select KVM_BOOK3S_HANDLER 37 38config KVM_BOOK3S_PR_POSSIBLE 39 bool 40 select KVM_MMIO 41 select MMU_NOTIFIER 42 43config KVM_BOOK3S_HV_POSSIBLE 44 bool 45 46config KVM_BOOK3S_32 47 tristate "KVM support for PowerPC book3s_32 processors" 48 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT 49 select KVM 50 select KVM_BOOK3S_32_HANDLER 51 select KVM_BOOK3S_PR_POSSIBLE 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 ---help--- 68 Support running unmodified book3s_64 and book3s_32 guest kernels 69 in virtual machines on book3s_64 host processors. 70 71 This module provides access to the hardware capabilities through 72 a character device node named /dev/kvm. 73 74 If unsure, say N. 75 76config KVM_BOOK3S_64_HV 77 tristate "KVM for POWER7 and later using hypervisor mode in host" 78 depends on KVM_BOOK3S_64 && PPC_POWERNV 79 select KVM_BOOK3S_HV_POSSIBLE 80 select MMU_NOTIFIER 81 select CMA 82 ---help--- 83 Support running unmodified book3s_64 guest kernels in 84 virtual machines on POWER7 and newer processors that have 85 hypervisor mode available to the host. 86 87 If you say Y here, KVM will use the hardware virtualization 88 facilities of POWER7 (and later) processors, meaning that 89 guest operating systems will run at full hardware speed 90 using supervisor and user modes. However, this also means 91 that KVM is not usable under PowerVM (pHyp), is only usable 92 on POWER7 or later processors, and cannot emulate a 93 different processor from the host processor. 94 95 If unsure, say N. 96 97config KVM_BOOK3S_64_PR 98 tristate "KVM support without using hypervisor mode in host" 99 depends on KVM_BOOK3S_64 100 select KVM_BOOK3S_PR_POSSIBLE 101 ---help--- 102 Support running guest kernels in virtual machines on processors 103 without using hypervisor mode in the host, by running the 104 guest in user mode (problem state) and emulating all 105 privileged instructions and registers. 106 107 This is not as fast as using hypervisor mode, but works on 108 machines where hypervisor mode is not available or not usable, 109 and can emulate processors that are different from the host 110 processor, including emulating 32-bit processors on a 64-bit 111 host. 112 113config KVM_BOOK3S_HV_EXIT_TIMING 114 bool "Detailed timing for hypervisor real-mode code" 115 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS 116 ---help--- 117 Calculate time taken for each vcpu in the real-mode guest entry, 118 exit, and interrupt handling code, plus time spent in the guest 119 and in nap mode due to idle (cede) while other threads are still 120 in the guest. The total, minimum and maximum times in nanoseconds 121 together with the number of executions are reported in debugfs in 122 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40 123 ns per exit on POWER8. 124 125 If unsure, say N. 126 127config KVM_BOOKE_HV 128 bool 129 130config KVM_EXIT_TIMING 131 bool "Detailed exit timing" 132 depends on KVM_E500V2 || KVM_E500MC 133 ---help--- 134 Calculate elapsed time for every exit/enter cycle. A per-vcpu 135 report is available in debugfs kvm/vm#_vcpu#_timing. 136 The overhead is relatively small, however it is not recommended for 137 production environments. 138 139 If unsure, say N. 140 141config KVM_E500V2 142 bool "KVM support for PowerPC E500v2 processors" 143 depends on E500 && !PPC_E500MC 144 select KVM 145 select KVM_MMIO 146 select MMU_NOTIFIER 147 ---help--- 148 Support running unmodified E500 guest kernels in virtual machines on 149 E500v2 host processors. 150 151 This module provides access to the hardware capabilities through 152 a character device node named /dev/kvm. 153 154 If unsure, say N. 155 156config KVM_E500MC 157 bool "KVM support for PowerPC E500MC/E5500/E6500 processors" 158 depends on PPC_E500MC 159 select KVM 160 select KVM_MMIO 161 select KVM_BOOKE_HV 162 select MMU_NOTIFIER 163 ---help--- 164 Support running unmodified E500MC/E5500/E6500 guest kernels in 165 virtual machines on E500MC/E5500/E6500 host processors. 166 167 This module provides access to the hardware capabilities through 168 a character device node named /dev/kvm. 169 170 If unsure, say N. 171 172config KVM_MPIC 173 bool "KVM in-kernel MPIC emulation" 174 depends on KVM && E500 175 select HAVE_KVM_IRQCHIP 176 select HAVE_KVM_IRQFD 177 select HAVE_KVM_IRQ_ROUTING 178 select HAVE_KVM_MSI 179 help 180 Enable support for emulating MPIC devices inside the 181 host kernel, rather than relying on userspace to emulate. 182 Currently, support is limited to certain versions of 183 Freescale's MPIC implementation. 184 185config KVM_XICS 186 bool "KVM in-kernel XICS emulation" 187 depends on KVM_BOOK3S_64 && !KVM_MPIC 188 select HAVE_KVM_IRQCHIP 189 select HAVE_KVM_IRQFD 190 default y 191 ---help--- 192 Include support for the XICS (eXternal Interrupt Controller 193 Specification) interrupt controller architecture used on 194 IBM POWER (pSeries) servers. 195 196source drivers/vhost/Kconfig 197 198endif # VIRTUALIZATION 199