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 PREEMPT_NOTIFIERS
23	select HAVE_KVM_EVENTFD
24	select HAVE_KVM_VCPU_ASYNC_IOCTL
25	select SRCU
26	select KVM_VFIO
27	select IRQ_BYPASS_MANAGER
28	select HAVE_KVM_IRQ_BYPASS
29	select INTERVAL_TREE
30
31config KVM_BOOK3S_HANDLER
32	bool
33
34config KVM_BOOK3S_32_HANDLER
35	bool
36	select KVM_BOOK3S_HANDLER
37	select KVM_MMIO
38
39config KVM_BOOK3S_64_HANDLER
40	bool
41	select KVM_BOOK3S_HANDLER
42
43config KVM_BOOK3S_PR_POSSIBLE
44	bool
45	select KVM_MMIO
46	select MMU_NOTIFIER
47
48config KVM_BOOK3S_HV_POSSIBLE
49	bool
50
51config KVM_BOOK3S_32
52	tristate "KVM support for PowerPC book3s_32 processors"
53	depends on PPC_BOOK3S_32 && !SMP && !PTE_64BIT
54	select KVM
55	select KVM_BOOK3S_32_HANDLER
56	select KVM_BOOK3S_PR_POSSIBLE
57	select PPC_FPU
58	help
59	  Support running unmodified book3s_32 guest kernels
60	  in virtual machines on book3s_32 host processors.
61
62	  This module provides access to the hardware capabilities through
63	  a character device node named /dev/kvm.
64
65	  If unsure, say N.
66
67config KVM_BOOK3S_64
68	tristate "KVM support for PowerPC book3s_64 processors"
69	depends on PPC_BOOK3S_64
70	select KVM_BOOK3S_64_HANDLER
71	select KVM
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)
75	help
76	  Support running unmodified book3s_64 and book3s_32 guest kernels
77	  in virtual machines on book3s_64 host processors.
78
79	  This module provides access to the hardware capabilities through
80	  a character device node named /dev/kvm.
81
82	  If unsure, say N.
83
84config 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
88	select MMU_NOTIFIER
89	select CMA
90	help
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.
94
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.
102
103	  If unsure, say N.
104
105config 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
109	help
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.
114
115	  This is only available for hash MMU mode and only supports
116	  guests that use hash MMU mode.
117
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
122	  host.
123
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.
129
130config KVM_BOOK3S_HV_EXIT_TIMING
131	bool "Detailed timing for hypervisor real-mode code"
132	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
133	help
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.
141
142	  If unsure, say N.
143
144config 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
147	default !EXPERT
148	help
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
153	  L2 guests.
154
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.
158
159config KVM_BOOKE_HV
160	bool
161
162config KVM_EXIT_TIMING
163	bool "Detailed exit timing"
164	depends on KVM_E500V2 || KVM_E500MC
165	help
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.
170
171	  If unsure, say N.
172
173config KVM_E500V2
174	bool "KVM support for PowerPC E500v2 processors"
175	depends on E500 && !PPC_E500MC
176	select KVM
177	select KVM_MMIO
178	select MMU_NOTIFIER
179	help
180	  Support running unmodified E500 guest kernels in virtual machines on
181	  E500v2 host processors.
182
183	  This module provides access to the hardware capabilities through
184	  a character device node named /dev/kvm.
185
186	  If unsure, say N.
187
188config KVM_E500MC
189	bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
190	depends on PPC_E500MC
191	select KVM
192	select KVM_MMIO
193	select KVM_BOOKE_HV
194	select MMU_NOTIFIER
195	help
196	  Support running unmodified E500MC/E5500/E6500 guest kernels in
197	  virtual machines on E500MC/E5500/E6500 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_MPIC
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
210	select HAVE_KVM_MSI
211	help
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.
216
217config KVM_XICS
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
222	default y
223	help
224	  Include support for the XICS (eXternal Interrupt Controller
225	  Specification) interrupt controller architecture used on
226	  IBM POWER (pSeries) servers.
227
228config KVM_XIVE
229	bool
230	default y
231	depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
232
233endif # VIRTUALIZATION
234