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
249