1 # SPDX-License-Identifier: GPL-2.0
6 source "virt/kvm/Kconfig"
8 menuconfig VIRTUALIZATION
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.
15 If you say N, all options in this submenu will be skipped and
22 select PREEMPT_NOTIFIERS
23 select HAVE_KVM_EVENTFD
24 select HAVE_KVM_VCPU_ASYNC_IOCTL
27 select IRQ_BYPASS_MANAGER
28 select HAVE_KVM_IRQ_BYPASS
31 config KVM_BOOK3S_HANDLER
34 config KVM_BOOK3S_32_HANDLER
36 select KVM_BOOK3S_HANDLER
39 config KVM_BOOK3S_64_HANDLER
41 select KVM_BOOK3S_HANDLER
43 config KVM_BOOK3S_PR_POSSIBLE
48 config KVM_BOOK3S_HV_POSSIBLE
52 tristate "KVM support for PowerPC book3s_32 processors"
53 depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
55 select KVM_BOOK3S_32_HANDLER
56 select KVM_BOOK3S_PR_POSSIBLE
59 Support running unmodified book3s_32 guest kernels
60 in virtual machines on book3s_32 host processors.
62 This module provides access to the hardware capabilities through
63 a character device node named /dev/kvm.
68 tristate "KVM support for PowerPC book3s_64 processors"
69 depends on PPC_BOOK3S_64
70 select KVM_BOOK3S_64_HANDLER
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)
76 Support running unmodified book3s_64 and book3s_32 guest kernels
77 in virtual machines on book3s_64 host processors.
79 This module provides access to the hardware capabilities through
80 a character device node named /dev/kvm.
84 config 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
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.
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.
105 config 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
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.
115 This is only available for hash MMU mode and only supports
116 guests that use hash MMU mode.
118 This is not as fast as using hypervisor mode, but works on
119 machines where hypervisor mode is not available or not usable,
120 and can emulate processors that are different from the host
121 processor, including emulating 32-bit processors on a 64-bit
124 Selecting this option will cause the SCV facility to be
125 disabled when the kernel is booted on the pseries platform in
126 hash MMU mode (regardless of PR VMs running). When any PR VMs
127 are running, "AIL" mode is disabled which may slow interrupts
128 and system calls on the host.
130 config KVM_BOOK3S_HV_EXIT_TIMING
131 bool "Detailed timing for hypervisor real-mode code"
132 depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
134 Calculate time taken for each vcpu in the real-mode guest entry,
135 exit, and interrupt handling code, plus time spent in the guest
136 and in nap mode due to idle (cede) while other threads are still
137 in the guest. The total, minimum and maximum times in nanoseconds
138 together with the number of executions are reported in debugfs in
139 kvm/vm#/vcpu#/timings. The overhead is of the order of 30 - 40
140 ns per exit on POWER8.
144 config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
145 bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT
146 depends on KVM_BOOK3S_HV_POSSIBLE
149 Old nested HV capable Linux guests have a bug where they don't
150 reflect the PMU in-use status of their L2 guest to the L0 host
151 while the L2 PMU registers are live. This can result in loss
152 of L2 PMU register state, causing perf to not work correctly in
155 Selecting this option for the L0 host implements a workaround for
156 those buggy L1s which saves the L2 state, at the cost of performance
157 in all nested-capable guest entry/exit.
162 config KVM_EXIT_TIMING
163 bool "Detailed exit timing"
164 depends on KVM_E500V2 || KVM_E500MC
166 Calculate elapsed time for every exit/enter cycle. A per-vcpu
167 report is available in debugfs kvm/vm#_vcpu#_timing.
168 The overhead is relatively small, however it is not recommended for
169 production environments.
174 bool "KVM support for PowerPC E500v2 processors"
175 depends on E500 && !PPC_E500MC
180 Support running unmodified E500 guest kernels in virtual machines on
181 E500v2 host processors.
183 This module provides access to the hardware capabilities through
184 a character device node named /dev/kvm.
189 bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
190 depends on PPC_E500MC
196 Support running unmodified E500MC/E5500/E6500 guest kernels in
197 virtual machines on E500MC/E5500/E6500 host processors.
199 This module provides access to the hardware capabilities through
200 a character device node named /dev/kvm.
205 bool "KVM in-kernel MPIC emulation"
206 depends on KVM && E500
207 select HAVE_KVM_IRQCHIP
208 select HAVE_KVM_IRQFD
209 select HAVE_KVM_IRQ_ROUTING
212 Enable support for emulating MPIC devices inside the
213 host kernel, rather than relying on userspace to emulate.
214 Currently, support is limited to certain versions of
215 Freescale's MPIC implementation.
218 bool "KVM in-kernel XICS emulation"
219 depends on KVM_BOOK3S_64 && !KVM_MPIC
220 select HAVE_KVM_IRQCHIP
221 select HAVE_KVM_IRQFD
224 Include support for the XICS (eXternal Interrupt Controller
225 Specification) interrupt controller architecture used on
226 IBM POWER (pSeries) servers.
231 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
233 endif # VIRTUALIZATION