Commit | Line | Data |
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ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
27fb7f00 RD |
2 | menu "Xen driver support" |
3 | depends on XEN | |
4 | ||
1775826c JF |
5 | config XEN_BALLOON |
6 | bool "Xen memory balloon driver" | |
1775826c JF |
7 | default y |
8 | help | |
9 | The balloon driver allows the Xen domain to request more memory from | |
10 | the system to expand the domain's memory allocation, or alternatively | |
11 | return unneeded memory to the system. | |
12 | ||
080e2be7 DK |
13 | config XEN_BALLOON_MEMORY_HOTPLUG |
14 | bool "Memory hotplug support for Xen balloon driver" | |
080e2be7 DK |
15 | depends on XEN_BALLOON && MEMORY_HOTPLUG |
16 | help | |
17 | Memory hotplug support for Xen balloon driver allows expanding memory | |
18 | available for the system above limit declared at system startup. | |
19 | It is very useful on critical systems which require long | |
20 | run without rebooting. | |
21 | ||
22 | Memory could be hotplugged in following steps: | |
23 | ||
703fc13a VK |
24 | 1) target domain: ensure that memory auto online policy is in |
25 | effect by checking /sys/devices/system/memory/auto_online_blocks | |
26 | file (should be 'online'). | |
27 | ||
28 | 2) control domain: xl mem-max <target-domain> <maxmem> | |
080e2be7 DK |
29 | where <maxmem> is >= requested memory size, |
30 | ||
703fc13a | 31 | 3) control domain: xl mem-set <target-domain> <memory> |
080e2be7 DK |
32 | where <memory> is requested memory size; alternatively memory |
33 | could be added by writing proper value to | |
34 | /sys/devices/system/xen_memory/xen_memory0/target or | |
703fc13a VK |
35 | /sys/devices/system/xen_memory/xen_memory0/target_kb on the |
36 | target domain. | |
080e2be7 | 37 | |
703fc13a VK |
38 | Alternatively, if memory auto onlining was not requested at step 1 |
39 | the newly added memory can be manually onlined in the target domain | |
40 | by doing the following: | |
080e2be7 | 41 | |
703fc13a VK |
42 | for i in /sys/devices/system/memory/memory*/state; do \ |
43 | [ "`cat "$i"`" = offline ] && echo online > "$i"; done | |
080e2be7 | 44 | |
703fc13a | 45 | or by adding the following line to udev rules: |
080e2be7 | 46 | |
703fc13a | 47 | SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'" |
080e2be7 | 48 | |
633d6f17 JG |
49 | config XEN_BALLOON_MEMORY_HOTPLUG_LIMIT |
50 | int "Hotplugged memory limit (in GiB) for a PV guest" | |
51 | default 512 if X86_64 | |
52 | default 4 if X86_32 | |
53 | range 0 64 if X86_32 | |
54 | depends on XEN_HAVE_PVMMU | |
55 | depends on XEN_BALLOON_MEMORY_HOTPLUG | |
56 | help | |
57 | Maxmium amount of memory (in GiB) that a PV guest can be | |
58 | expanded to when using memory hotplug. | |
59 | ||
60 | A PV guest can have more memory than this limit if is | |
61 | started with a larger maximum. | |
62 | ||
63 | This value is used to allocate enough space in internal | |
64 | tables needed for physical memory administration. | |
65 | ||
197ecb38 MMG |
66 | config XEN_SCRUB_PAGES_DEFAULT |
67 | bool "Scrub pages before returning them to system by default" | |
1775826c JF |
68 | depends on XEN_BALLOON |
69 | default y | |
70 | help | |
71 | Scrub pages before returning them to the system for reuse by | |
72 | other domains. This makes sure that any confidential data | |
af320de9 | 73 | is not accidentally visible to other domains. It is more |
197ecb38 MMG |
74 | secure, but slightly less efficient. This can be controlled with |
75 | xen_scrub_pages=0 parameter and | |
76 | /sys/devices/system/xen_memory/xen_memory0/scrub_pages. | |
77 | This option only sets the default value. | |
78 | ||
1775826c | 79 | If in doubt, say yes. |
1107ba88 | 80 | |
f7116284 IC |
81 | config XEN_DEV_EVTCHN |
82 | tristate "Xen /dev/xen/evtchn device" | |
f7116284 IC |
83 | default y |
84 | help | |
6b2aac42 | 85 | The evtchn driver allows a userspace process to trigger event |
f7116284 IC |
86 | channels and to receive notification of an event channel |
87 | firing. | |
88 | If in doubt, say yes. | |
89 | ||
df660251 | 90 | config XEN_BACKEND |
329620a8 | 91 | bool "Backend driver support" |
ea9e57d0 | 92 | default XEN_DOM0 |
df660251 IC |
93 | help |
94 | Support for backend device drivers that provide I/O services | |
95 | to other virtual machines. | |
96 | ||
1107ba88 AZ |
97 | config XENFS |
98 | tristate "Xen filesystem" | |
d8414d3c | 99 | select XEN_PRIVCMD |
1107ba88 AZ |
100 | default y |
101 | help | |
102 | The xen filesystem provides a way for domains to share | |
103 | information with each other and with the hypervisor. | |
104 | For example, by reading and writing the "xenbus" file, guests | |
105 | may pass arbitrary information to the initial domain. | |
106 | If in doubt, say yes. | |
107 | ||
108 | config XEN_COMPAT_XENFS | |
109 | bool "Create compatibility mount point /proc/xen" | |
110 | depends on XENFS | |
111 | default y | |
112 | help | |
113 | The old xenstore userspace tools expect to find "xenbus" | |
114 | under /proc/xen, but "xenbus" is now found at the root of the | |
115 | xenfs filesystem. Selecting this causes the kernel to create | |
692105b8 | 116 | the compatibility mount point /proc/xen if it is running on |
1107ba88 AZ |
117 | a xen platform. |
118 | If in doubt, say yes. | |
119 | ||
cff7e81b JF |
120 | config XEN_SYS_HYPERVISOR |
121 | bool "Create xen entries under /sys/hypervisor" | |
27fb7f00 | 122 | depends on SYSFS |
cff7e81b JF |
123 | select SYS_HYPERVISOR |
124 | default y | |
125 | help | |
126 | Create entries under /sys/hypervisor describing the Xen | |
127 | hypervisor environment. When running native or in another | |
128 | virtual environment, /sys/hypervisor will still be present, | |
27fb7f00 RD |
129 | but will have no xen contents. |
130 | ||
2de06cc1 | 131 | config XEN_XENBUS_FRONTEND |
9c4bc1c2 LT |
132 | tristate |
133 | ||
ab31523c GH |
134 | config XEN_GNTDEV |
135 | tristate "userspace grant access device driver" | |
136 | depends on XEN | |
1f169f66 | 137 | default m |
ab31523c GH |
138 | select MMU_NOTIFIER |
139 | help | |
140 | Allows userspace processes to use grants. | |
6bac7f9f | 141 | |
932d6562 OA |
142 | config XEN_GNTDEV_DMABUF |
143 | bool "Add support for dma-buf grant access device driver extension" | |
144 | depends on XEN_GNTDEV && XEN_GRANT_DMA_ALLOC && DMA_SHARED_BUFFER | |
145 | help | |
146 | Allows userspace processes and kernel modules to use Xen backed | |
147 | dma-buf implementation. With this extension grant references to | |
148 | the pages of an imported dma-buf can be exported for other domain | |
149 | use and grant references coming from a foreign domain can be | |
150 | converted into a local dma-buf for local export. | |
151 | ||
dd314058 DDG |
152 | config XEN_GRANT_DEV_ALLOC |
153 | tristate "User-space grant reference allocator driver" | |
154 | depends on XEN | |
1f169f66 | 155 | default m |
dd314058 DDG |
156 | help |
157 | Allows userspace processes to create pages with access granted | |
158 | to other domains. This can be used to implement frontend drivers | |
159 | or as part of an inter-domain shared memory channel. | |
160 | ||
9bdc7304 OA |
161 | config XEN_GRANT_DMA_ALLOC |
162 | bool "Allow allocating DMA capable buffers with grant reference module" | |
163 | depends on XEN && HAS_DMA | |
164 | help | |
165 | Extends grant table module API to allow allocating DMA capable | |
166 | buffers and mapping foreign grant references on top of it. | |
167 | The resulting buffer is similar to one allocated by the balloon | |
168 | driver in that proper memory reservation is made by | |
169 | ({increase|decrease}_reservation and VA mappings are updated if | |
170 | needed). | |
171 | This is useful for sharing foreign buffers with HW drivers which | |
172 | cannot work with scattered buffers provided by the balloon driver, | |
173 | but require DMAable memory instead. | |
174 | ||
b097186f KRW |
175 | config SWIOTLB_XEN |
176 | def_bool y | |
2775609c | 177 | select SWIOTLB |
b097186f | 178 | |
30edc14b KRW |
179 | config XEN_PCIDEV_BACKEND |
180 | tristate "Xen PCI-device backend driver" | |
181 | depends on PCI && X86 && XEN | |
182 | depends on XEN_BACKEND | |
2ebdc426 | 183 | default m |
30edc14b KRW |
184 | help |
185 | The PCI device backend driver allows the kernel to export arbitrary | |
186 | PCI devices to other guests. If you select this to be a module, you | |
187 | will need to make sure no other driver has bound to the device(s) | |
188 | you want to make visible to other guests. | |
189 | ||
2ebdc426 KRW |
190 | The parameter "passthrough" allows you specify how you want the PCI |
191 | devices to appear in the guest. You can choose the default (0) where | |
192 | PCI topology starts at 00.00.0, or (1) for passthrough if you want | |
193 | the PCI devices topology appear the same as in the host. | |
30edc14b | 194 | |
2ebdc426 KRW |
195 | The "hide" parameter (only applicable if backend driver is compiled |
196 | into the kernel) allows you to bind the PCI devices to this module | |
197 | from the default device drivers. The argument is the list of PCI BDFs: | |
198 | xen-pciback.hide=(03:00.0)(04:00.0) | |
30edc14b | 199 | |
2ebdc426 | 200 | If in doubt, say m. |
d8414d3c | 201 | |
5eee149a SS |
202 | config XEN_PVCALLS_FRONTEND |
203 | tristate "XEN PV Calls frontend driver" | |
204 | depends on INET && XEN | |
5eee149a SS |
205 | select XEN_XENBUS_FRONTEND |
206 | help | |
207 | Experimental frontend for the Xen PV Calls protocol | |
208 | (https://xenbits.xen.org/docs/unstable/misc/pvcalls.html). It | |
209 | sends a small set of POSIX calls to the backend, which | |
210 | implements them. | |
211 | ||
42d3078a SS |
212 | config XEN_PVCALLS_BACKEND |
213 | bool "XEN PV Calls backend driver" | |
214 | depends on INET && XEN && XEN_BACKEND | |
42d3078a SS |
215 | help |
216 | Experimental backend for the Xen PV Calls protocol | |
217 | (https://xenbits.xen.org/docs/unstable/misc/pvcalls.html). It | |
218 | allows PV Calls frontends to send POSIX calls to the backend, | |
219 | which implements them. | |
220 | ||
221 | If in doubt, say n. | |
222 | ||
d9d660f6 JG |
223 | config XEN_SCSI_BACKEND |
224 | tristate "XEN SCSI backend driver" | |
225 | depends on XEN && XEN_BACKEND && TARGET_CORE | |
226 | help | |
227 | The SCSI backend driver allows the kernel to export its SCSI Devices | |
228 | to other guests via a high-performance shared-memory interface. | |
229 | Only needed for systems running as XEN driver domains (e.g. Dom0) and | |
230 | if guests need generic access to SCSI devices. | |
231 | ||
d8414d3c BB |
232 | config XEN_PRIVCMD |
233 | tristate | |
234 | depends on XEN | |
235 | default m | |
236 | ||
dcb93b96 LJ |
237 | config XEN_STUB |
238 | bool "Xen stub drivers" | |
76fc2537 | 239 | depends on XEN && X86_64 && BROKEN |
dcb93b96 LJ |
240 | help |
241 | Allow kernel to install stub drivers, to reserve space for Xen drivers, | |
242 | i.e. memory hotplug and cpu hotplug, and to block native drivers loaded, | |
243 | so that real Xen drivers can be modular. | |
244 | ||
245 | To enable Xen features like cpu and memory hotplug, select Y here. | |
246 | ||
ef92e7ca LJ |
247 | config XEN_ACPI_HOTPLUG_MEMORY |
248 | tristate "Xen ACPI memory hotplug" | |
249 | depends on XEN_DOM0 && XEN_STUB && ACPI | |
ef92e7ca LJ |
250 | help |
251 | This is Xen ACPI memory hotplug. | |
252 | ||
253 | Currently Xen only support ACPI memory hot-add. If you want | |
254 | to hot-add memory at runtime (the hot-added memory cannot be | |
255 | removed until machine stop), select Y/M here, otherwise select N. | |
256 | ||
39adc483 LJ |
257 | config XEN_ACPI_HOTPLUG_CPU |
258 | tristate "Xen ACPI cpu hotplug" | |
259 | depends on XEN_DOM0 && XEN_STUB && ACPI | |
260 | select ACPI_CONTAINER | |
39adc483 LJ |
261 | help |
262 | Xen ACPI cpu enumerating and hotplugging | |
263 | ||
264 | For hotplugging, currently Xen only support ACPI cpu hotadd. | |
265 | If you want to hotadd cpu at runtime (the hotadded cpu cannot | |
266 | be removed until machine stop), select Y/M here. | |
267 | ||
59a56802 KRW |
268 | config XEN_ACPI_PROCESSOR |
269 | tristate "Xen ACPI processor" | |
c4f9d9cb | 270 | depends on XEN && XEN_DOM0 && X86 && ACPI_PROCESSOR && CPU_FREQ |
102b208e | 271 | default m |
59a56802 | 272 | help |
1fd14432 AM |
273 | This ACPI processor uploads Power Management information to the Xen |
274 | hypervisor. | |
275 | ||
276 | To do that the driver parses the Power Management data and uploads | |
277 | said information to the Xen hypervisor. Then the Xen hypervisor can | |
5065a706 | 278 | select the proper Cx and Pxx states. It also registers itself as the |
1fd14432 AM |
279 | SMM so that other drivers (such as ACPI cpufreq scaling driver) will |
280 | not load. | |
281 | ||
282 | To compile this driver as a module, choose M here: the module will be | |
283 | called xen_acpi_processor If you do not know what to choose, select | |
284 | M here. If the CPUFREQ drivers are built in, select Y here. | |
59a56802 | 285 | |
cef12ee5 LJ |
286 | config XEN_MCE_LOG |
287 | bool "Xen platform mcelog" | |
288 | depends on XEN_DOM0 && X86_64 && X86_MCE | |
cef12ee5 LJ |
289 | help |
290 | Allow kernel fetching MCE error from Xen platform and | |
291 | converting it into Linux mcelog format for mcelog tools | |
292 | ||
c2374bf5 IC |
293 | config XEN_HAVE_PVMMU |
294 | bool | |
295 | ||
be81c8a1 DK |
296 | config XEN_EFI |
297 | def_bool y | |
be1aaf4e | 298 | depends on (ARM || ARM64 || X86_64) && EFI |
be81c8a1 | 299 | |
628c28ee DV |
300 | config XEN_AUTO_XLATE |
301 | def_bool y | |
302 | depends on ARM || ARM64 || XEN_PVHVM | |
303 | help | |
304 | Support for auto-translated physmap guests. | |
305 | ||
42068cfd HG |
306 | config XEN_ACPI |
307 | def_bool y | |
308 | depends on X86 && ACPI | |
309 | ||
a11f4f0a BO |
310 | config XEN_SYMS |
311 | bool "Xen symbols" | |
312 | depends on X86 && XEN_DOM0 && XENFS | |
313 | default y if KALLSYMS | |
314 | help | |
315 | Exports hypervisor symbols (along with their types and addresses) via | |
316 | /proc/xen/xensyms file, similar to /proc/kallsyms | |
317 | ||
5f141548 BO |
318 | config XEN_HAVE_VPMU |
319 | bool | |
320 | ||
b3383974 OA |
321 | config XEN_FRONT_PGDIR_SHBUF |
322 | tristate | |
323 | ||
27fb7f00 | 324 | endmenu |