Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 KVM_COMMON
23 select HAVE_KVM_VCPU_ASYNC_IOCTL
24 select KVM_VFIO
25 select HAVE_KVM_IRQ_BYPASS
26
27config KVM_BOOK3S_HANDLER
28 bool
29
30config KVM_BOOK3S_32_HANDLER
31 bool
32 select KVM_BOOK3S_HANDLER
33 select KVM_MMIO
34
35config KVM_BOOK3S_64_HANDLER
36 bool
37 select KVM_BOOK3S_HANDLER
38
39config KVM_BOOK3S_PR_POSSIBLE
40 bool
41 select KVM_MMIO
42 select KVM_GENERIC_MMU_NOTIFIER
43
44config KVM_BOOK3S_HV_POSSIBLE
45 bool
46
47config 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
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 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
81config 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
102config 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
128config KVM_BOOK3S_HV_EXIT_TIMING
129 bool
130
131config 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
144config 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
159config 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
174config KVM_BOOKE_HV
175 bool
176
177config 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
188config 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
204config 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
221config 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
233config 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
243config KVM_XIVE
244 bool
245 default y
246 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
247
248endif # VIRTUALIZATION