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1#
2# KVM configuration
3#
4
5source "virt/kvm/Kconfig"
6
7menuconfig VIRTUALIZATION
8	bool "Virtualization"
9	---help---
10	  Say Y here to get to see options for using your Linux host to run
11	  other operating systems inside virtual machines (guests).
12	  This option alone does not add any kernel code.
13
14	  If you say N, all options in this submenu will be skipped and
15	  disabled.
16
17if VIRTUALIZATION
18
19config KVM
20	bool
21	select PREEMPT_NOTIFIERS
22	select ANON_INODES
23	select HAVE_KVM_EVENTFD
24	select SRCU
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 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	select KVM
50	select KVM_BOOK3S_32_HANDLER
51	select KVM_BOOK3S_PR_POSSIBLE
52	---help---
53	  Support running unmodified book3s_32 guest kernels
54	  in virtual machines on book3s_32 host processors.
55
56	  This module provides access to the hardware capabilities through
57	  a character device node named /dev/kvm.
58
59	  If unsure, say N.
60
61config KVM_BOOK3S_64
62	tristate "KVM support for PowerPC book3s_64 processors"
63	depends on PPC_BOOK3S_64
64	select KVM_BOOK3S_64_HANDLER
65	select KVM
66	select KVM_BOOK3S_PR_POSSIBLE if !KVM_BOOK3S_HV_POSSIBLE
67	---help---
68	  Support running unmodified book3s_64 and book3s_32 guest kernels
69	  in virtual machines on book3s_64 host processors.
70
71	  This module provides access to the hardware capabilities through
72	  a character device node named /dev/kvm.
73
74	  If unsure, say N.
75
76config KVM_BOOK3S_64_HV
77	tristate "KVM for POWER7 and later using hypervisor mode in host"
78	depends on KVM_BOOK3S_64 && PPC_POWERNV
79	select KVM_BOOK3S_HV_POSSIBLE
80	select MMU_NOTIFIER
81	select CMA
82	---help---
83	  Support running unmodified book3s_64 guest kernels in
84	  virtual machines on POWER7 and newer processors that have
85	  hypervisor mode available to the host.
86
87	  If you say Y here, KVM will use the hardware virtualization
88	  facilities of POWER7 (and later) processors, meaning that
89	  guest operating systems will run at full hardware speed
90	  using supervisor and user modes.  However, this also means
91	  that KVM is not usable under PowerVM (pHyp), is only usable
92	  on POWER7 or later processors, and cannot emulate a
93	  different processor from the host processor.
94
95	  If unsure, say N.
96
97config KVM_BOOK3S_64_PR
98	tristate "KVM support without using hypervisor mode in host"
99	depends on KVM_BOOK3S_64
100	select KVM_BOOK3S_PR_POSSIBLE
101	---help---
102	  Support running guest kernels in virtual machines on processors
103	  without using hypervisor mode in the host, by running the
104	  guest in user mode (problem state) and emulating all
105	  privileged instructions and registers.
106
107	  This is not as fast as using hypervisor mode, but works on
108	  machines where hypervisor mode is not available or not usable,
109	  and can emulate processors that are different from the host
110	  processor, including emulating 32-bit processors on a 64-bit
111	  host.
112
113config KVM_BOOK3S_HV_EXIT_TIMING
114	bool "Detailed timing for hypervisor real-mode code"
115	depends on KVM_BOOK3S_HV_POSSIBLE && DEBUG_FS
116	---help---
117	  Calculate time taken for each vcpu in the real-mode guest entry,
118	  exit, and interrupt handling code, plus time spent in the guest
119	  and in nap mode due to idle (cede) while other threads are still
120	  in the guest.  The total, minimum and maximum times in nanoseconds
121	  together with the number of executions are reported in debugfs in
122	  kvm/vm#/vcpu#/timings.  The overhead is of the order of 30 - 40
123	  ns per exit on POWER8.
124
125	  If unsure, say N.
126
127config KVM_BOOKE_HV
128	bool
129
130config KVM_EXIT_TIMING
131	bool "Detailed exit timing"
132	depends on KVM_E500V2 || KVM_E500MC
133	---help---
134	  Calculate elapsed time for every exit/enter cycle. A per-vcpu
135	  report is available in debugfs kvm/vm#_vcpu#_timing.
136	  The overhead is relatively small, however it is not recommended for
137	  production environments.
138
139	  If unsure, say N.
140
141config KVM_E500V2
142	bool "KVM support for PowerPC E500v2 processors"
143	depends on E500 && !PPC_E500MC
144	select KVM
145	select KVM_MMIO
146	select MMU_NOTIFIER
147	---help---
148	  Support running unmodified E500 guest kernels in virtual machines on
149	  E500v2 host processors.
150
151	  This module provides access to the hardware capabilities through
152	  a character device node named /dev/kvm.
153
154	  If unsure, say N.
155
156config KVM_E500MC
157	bool "KVM support for PowerPC E500MC/E5500/E6500 processors"
158	depends on PPC_E500MC
159	select KVM
160	select KVM_MMIO
161	select KVM_BOOKE_HV
162	select MMU_NOTIFIER
163	---help---
164	  Support running unmodified E500MC/E5500/E6500 guest kernels in
165	  virtual machines on E500MC/E5500/E6500 host processors.
166
167	  This module provides access to the hardware capabilities through
168	  a character device node named /dev/kvm.
169
170	  If unsure, say N.
171
172config KVM_MPIC
173	bool "KVM in-kernel MPIC emulation"
174	depends on KVM && E500
175	select HAVE_KVM_IRQCHIP
176	select HAVE_KVM_IRQFD
177	select HAVE_KVM_IRQ_ROUTING
178	select HAVE_KVM_MSI
179	help
180	  Enable support for emulating MPIC devices inside the
181          host kernel, rather than relying on userspace to emulate.
182          Currently, support is limited to certain versions of
183          Freescale's MPIC implementation.
184
185config KVM_XICS
186	bool "KVM in-kernel XICS emulation"
187	depends on KVM_BOOK3S_64 && !KVM_MPIC
188	select HAVE_KVM_IRQCHIP
189	select HAVE_KVM_IRQFD
190	default y
191	---help---
192	  Include support for the XICS (eXternal Interrupt Controller
193	  Specification) interrupt controller architecture used on
194	  IBM POWER (pSeries) servers.
195
196source drivers/vhost/Kconfig
197
198endif # VIRTUALIZATION
199