xref: /linux/arch/powerpc/kvm/Kconfig (revision 3349ada3cffdbe4579872a004360daa31938f683)
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 KVM_BOOK3S_HV_PMU
87	select CMA
88	help
89	  Support running unmodified book3s_64 guest kernels in
90	  virtual machines on POWER7 and newer processors that have
91	  hypervisor mode available to the host.
92
93	  If you say Y here, KVM will use the hardware virtualization
94	  facilities of POWER7 (and later) processors, meaning that
95	  guest operating systems will run at full hardware speed
96	  using supervisor and user modes.  However, this also means
97	  that KVM is not usable under PowerVM (pHyp), is only usable
98	  on POWER7 or later processors, and cannot emulate a
99	  different processor from the host processor.
100
101	  If unsure, say N.
102
103config KVM_BOOK3S_64_PR
104	tristate "KVM support without using hypervisor mode in host"
105	depends on KVM_BOOK3S_64
106	depends on !CONTEXT_TRACKING_USER
107	select KVM_BOOK3S_PR_POSSIBLE
108	help
109	  Support running guest kernels in virtual machines on processors
110	  without using hypervisor mode in the host, by running the
111	  guest in user mode (problem state) and emulating all
112	  privileged instructions and registers.
113
114	  This is only available for hash MMU mode and only supports
115	  guests that use hash MMU mode.
116
117	  This is not as fast as using hypervisor mode, but works on
118	  machines where hypervisor mode is not available or not usable,
119	  and can emulate processors that are different from the host
120	  processor, including emulating 32-bit processors on a 64-bit
121	  host.
122
123	  Selecting this option will cause the SCV facility to be
124	  disabled when the kernel is booted on the pseries platform in
125	  hash MMU mode (regardless of PR VMs running). When any PR VMs
126	  are running, "AIL" mode is disabled which may slow interrupts
127	  and system calls on the host.
128
129config KVM_BOOK3S_HV_EXIT_TIMING
130	bool
131
132config KVM_BOOK3S_HV_P9_TIMING
133	bool "Detailed timing for the P9 entry point"
134	select KVM_BOOK3S_HV_EXIT_TIMING
135	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
136	help
137	  Calculate time taken for each vcpu during vcpu entry and
138	  exit, time spent inside the guest and time spent handling
139	  hypercalls and page faults. The total, minimum and maximum
140	  times in nanoseconds together with the number of executions
141	  are reported in debugfs in kvm/vm#/vcpu#/timings.
142
143	  If unsure, say N.
144
145config KVM_BOOK3S_HV_P8_TIMING
146	bool "Detailed timing for hypervisor real-mode code (for POWER8)"
147	select KVM_BOOK3S_HV_EXIT_TIMING
148	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS && !KVM_BOOK3S_HV_P9_TIMING
149	help
150	  Calculate time taken for each vcpu in the real-mode guest entry,
151	  exit, and interrupt handling code, plus time spent in the guest
152	  and in nap mode due to idle (cede) while other threads are still
153	  in the guest.  The total, minimum and maximum times in nanoseconds
154	  together with the number of executions are reported in debugfs in
155	  kvm/vm#/vcpu#/timings.  The overhead is of the order of 30 - 40
156	  ns per exit on POWER8.
157
158	  If unsure, say N.
159
160config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND
161	bool "Nested L0 host workaround for L1 KVM host PMU handling bug" if EXPERT
162	depends on KVM_BOOK3S_HV_POSSIBLE
163	default !EXPERT
164	help
165	  Old nested HV capable Linux guests have a bug where they don't
166	  reflect the PMU in-use status of their L2 guest to the L0 host
167	  while the L2 PMU registers are live. This can result in loss
168	  of L2 PMU register state, causing perf to not work correctly in
169	  L2 guests.
170
171	  Selecting this option for the L0 host implements a workaround for
172	  those buggy L1s which saves the L2 state, at the cost of performance
173	  in all nested-capable guest entry/exit.
174
175config KVM_BOOK3S_HV_PMU
176	tristate "Hypervisor Perf events for KVM Book3s-HV"
177	depends on KVM_BOOK3S_64_HV
178	help
179	  Enable Book3s-HV Hypervisor Perf events PMU named 'kvm-hv'. These
180	  Perf events give an overview of hypervisor performance overall
181	  instead of a specific guests. Currently the PMU reports
182	  L0-Hypervisor stats on a kvm-hv enabled PSeries LPAR like:
183	  * Total/Used Guest-Heap
184	  * Total/Used Guest Page-table Memory
185	  * Total amount of Guest Page-table Memory reclaimed
186
187config KVM_BOOKE_HV
188	bool
189
190config KVM_EXIT_TIMING
191	bool "Detailed exit timing"
192	depends on KVM_E500V2 || KVM_E500MC
193	help
194	  Calculate elapsed time for every exit/enter cycle. A per-vcpu
195	  report is available in debugfs kvm/vm#_vcpu#_timing.
196	  The overhead is relatively small, however it is not recommended for
197	  production environments.
198
199	  If unsure, say N.
200
201config KVM_E500V2
202	bool "KVM support for PowerPC E500v2 processors"
203	depends on PPC_E500 && !PPC_E500MC
204	depends on !CONTEXT_TRACKING_USER
205	select KVM
206	select KVM_MMIO
207	select KVM_GENERIC_MMU_NOTIFIER
208	help
209	  Support running unmodified E500 guest kernels in virtual machines on
210	  E500v2 host processors.
211
212	  This module provides access to the hardware capabilities through
213	  a character device node named /dev/kvm.
214
215	  If unsure, say N.
216
217config KVM_E500MC
218	bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
219	depends on PPC_E500MC
220	depends on !CONTEXT_TRACKING_USER
221	select KVM
222	select KVM_MMIO
223	select KVM_BOOKE_HV
224	select KVM_GENERIC_MMU_NOTIFIER
225	help
226	  Support running unmodified E500MC/E5500/E6500 guest kernels in
227	  virtual machines on E500MC/E5500/E6500 host processors.
228
229	  This module provides access to the hardware capabilities through
230	  a character device node named /dev/kvm.
231
232	  If unsure, say N.
233
234config KVM_MPIC
235	bool "KVM in-kernel MPIC emulation"
236	depends on KVM && PPC_E500
237	select HAVE_KVM_IRQCHIP
238	select HAVE_KVM_IRQ_ROUTING
239	select HAVE_KVM_MSI
240	help
241	  Enable support for emulating MPIC devices inside the
242	  host kernel, rather than relying on userspace to emulate.
243	  Currently, support is limited to certain versions of
244	  Freescale's MPIC implementation.
245
246config KVM_XICS
247	bool "KVM in-kernel XICS emulation"
248	depends on KVM_BOOK3S_64 && !KVM_MPIC
249	select HAVE_KVM_IRQCHIP
250	default y
251	help
252	  Include support for the XICS (eXternal Interrupt Controller
253	  Specification) interrupt controller architecture used on
254	  IBM POWER (pSeries) servers.
255
256config KVM_XIVE
257	bool
258	default y
259	depends on KVM_XICS && PPC_XIVE_NATIVE && KVM_BOOK3S_HV_POSSIBLE
260
261endif # VIRTUALIZATION
262