tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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 KVM_VFIO
24 select HAVE_KVM_IRQ_BYPASS
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 KVM_GENERIC_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 depends on !CONTEXT_TRACKING_USER
50 select KVM
51 select KVM_BOOK3S_32_HANDLER
52 select KVM_BOOK3S_PR_POSSIBLE
53 select PPC_FPU
54 help
55 Support running unmodified book3s_32 guest kernels
56 in virtual machines on book3s_32 host processors.
57
58 This module provides access to the hardware capabilities through
59 a character device node named /dev/kvm.
60
61 If unsure, say N.
62
63config KVM_BOOK3S_64
64 tristate "KVM support for PowerPC book3s_64 processors"
65 depends on PPC_BOOK3S_64
66 select KVM_BOOK3S_64_HANDLER
67 select KVM
68 select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE
69 select PPC_64S_HASH_MMU
70 select SPAPR_TCE_IOMMU if IOMMU_SUPPORT && (PPC_PSERIES || PPC_POWERNV)
71 help
72 Support running unmodified book3s_64 and book3s_32 guest kernels
73 in virtual machines on book3s_64 host processors.
74
75 This module provides access to the hardware capabilities through
76 a character device node named /dev/kvm.
77
78 If unsure, say N.
79
80config KVM_BOOK3S_64_HV
81 tristate "KVM for POWER7 and later using hypervisor mode in host"
82 depends on KVM_BOOK3S_64 && PPC_POWERNV
83 select KVM_BOOK3S_HV_POSSIBLE
84 select KVM_GENERIC_MMU_NOTIFIER
85 select KVM_BOOK3S_HV_PMU
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_BOOK3S_HV_PMU
175 tristate "Hypervisor Perf events for KVM Book3s-HV"
176 depends on KVM_BOOK3S_64_HV
177 help
178 Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These
179 Perf events give an overview of hypervisor performance overall
180 instead of a specific guests. Currently the PMU reports
181 L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like:
182 * Total/Used Guest-Heap
183 * Total/Used Guest Page-table Memory
184 * Total amount of Guest Page-table Memory reclaimed
185
186config KVM_BOOKE_HV
187 bool
188
189config KVM_EXIT_TIMING
190 bool "Detailed exit timing"
191 depends on KVM_E500V2 || KVM_E500MC
192 help
193 Calculate elapsed time for every exit/enter cycle. A per-vcpu
194 report is available in debugfs kvm/vm#_vcpu#_timing.
195 The overhead is relatively small, however it is not recommended for
196 production environments.
197
198 If unsure, say N.
199
200config KVM_E500V2
201 bool "KVM support for PowerPC E500v2 processors"
202 depends on PPC_E500 && !PPC_E500MC
203 depends on !CONTEXT_TRACKING_USER
204 select KVM
205 select KVM_MMIO
206 select KVM_GENERIC_MMU_NOTIFIER
207 help
208 Support running unmodified E500 guest kernels in virtual machines on
209 E500v2 host processors.
210
211 This module provides access to the hardware capabilities through
212 a character device node named /dev/kvm.
213
214 If unsure, say N.
215
216config KVM_E500MC
217 bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
218 depends on PPC_E500MC
219 depends on !CONTEXT_TRACKING_USER
220 select KVM
221 select KVM_MMIO
222 select KVM_BOOKE_HV
223 select KVM_GENERIC_MMU_NOTIFIER
224 help
225 Support running unmodified E500MC/E5500/E6500 guest kernels in
226 virtual machines on E500MC/E5500/E6500 host processors.
227
228 This module provides access to the hardware capabilities through
229 a character device node named /dev/kvm.
230
231 If unsure, say N.
232
233config KVM_MPIC
234 bool "KVM in-kernel MPIC emulation"
235 depends on KVM && PPC_E500
236 select HAVE_KVM_IRQCHIP
237 select HAVE_KVM_IRQ_ROUTING
238 select HAVE_KVM_MSI
239 help
240 Enable support for emulating MPIC devices inside the
241 host kernel, rather than relying on userspace to emulate.
242 Currently, support is limited to certain versions of
243 Freescale's MPIC implementation.
244
245config KVM_XICS
246 bool "KVM in-kernel XICS emulation"
247 depends on KVM_BOOK3S_64 && !KVM_MPIC
248 select HAVE_KVM_IRQCHIP
249 default y
250 help
251 Include support for the XICS (eXternal Interrupt Controller
252 Specification) interrupt controller architecture used on
253 IBM POWER (pSeries) servers.
254
255config KVM_XIVE
256 bool
257 default y
258 depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
259
260endif # VIRTUALIZATION