1 menu "Xen driver support"
5 bool "Xen memory balloon driver"
8 The balloon driver allows the Xen domain to request more memory from
9 the system to expand the domain's memory allocation, or alternatively
10 return unneeded memory to the system.
12 config XEN_SELFBALLOONING
13 bool "Dynamically self-balloon kernel memory to target"
14 depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP
17 Self-ballooning dynamically balloons available kernel memory driven
18 by the current usage of anonymous memory ("committed AS") and
19 controlled by various sysfs-settable parameters. Configuring
20 FRONTSWAP is highly recommended; if it is not configured, self-
21 ballooning is disabled by default but can be enabled with the
22 'selfballooning' kernel boot parameter. If FRONTSWAP is configured,
23 frontswap-selfshrinking is enabled by default but can be disabled
24 with the 'noselfshrink' kernel boot parameter; and self-ballooning
25 is enabled by default but can be disabled with the 'noselfballooning'
26 kernel boot parameter. Note that systems without a sufficiently
27 large swap device should not enable self-ballooning.
29 config XEN_SCRUB_PAGES
30 bool "Scrub pages before returning them to system"
31 depends on XEN_BALLOON
34 Scrub pages before returning them to the system for reuse by
35 other domains. This makes sure that any confidential data
36 is not accidentally visible to other domains. Is it more
37 secure, but slightly less efficient.
41 tristate "Xen /dev/xen/evtchn device"
44 The evtchn driver allows a userspace process to triger event
45 channels and to receive notification of an event channel
50 bool "Backend driver support"
54 Support for backend device drivers that provide I/O services
55 to other virtual machines.
58 tristate "Xen filesystem"
61 The xen filesystem provides a way for domains to share
62 information with each other and with the hypervisor.
63 For example, by reading and writing the "xenbus" file, guests
64 may pass arbitrary information to the initial domain.
67 config XEN_COMPAT_XENFS
68 bool "Create compatibility mount point /proc/xen"
72 The old xenstore userspace tools expect to find "xenbus"
73 under /proc/xen, but "xenbus" is now found at the root of the
74 xenfs filesystem. Selecting this causes the kernel to create
75 the compatibility mount point /proc/xen if it is running on
79 config XEN_SYS_HYPERVISOR
80 bool "Create xen entries under /sys/hypervisor"
85 Create entries under /sys/hypervisor describing the Xen
86 hypervisor environment. When running native or in another
87 virtual environment, /sys/hypervisor will still be present,
88 but will have no xen contents.
90 config XEN_XENBUS_FRONTEND
94 tristate "userspace grant access device driver"
99 Allows userspace processes to use grants.
101 config XEN_GRANT_DEV_ALLOC
102 tristate "User-space grant reference allocator driver"
106 Allows userspace processes to create pages with access granted
107 to other domains. This can be used to implement frontend drivers
108 or as part of an inter-domain shared memory channel.
110 config XEN_PLATFORM_PCI
111 tristate "xen platform pci device driver"
112 depends on XEN_PVHVM && PCI
115 Driver for the Xen PCI Platform device: it is responsible for
116 initializing xenbus and grant_table when running in a Xen HVM
117 domain. As a consequence this driver is required to run any Xen PV
127 default y if (CLEANCACHE || FRONTSWAP)
129 Shim to interface in-kernel Transcendent Memory hooks
130 (e.g. cleancache and frontswap) to Xen tmem hypercalls.
132 config XEN_PCIDEV_BACKEND
133 tristate "Xen PCI-device backend driver"
134 depends on PCI && X86 && XEN
135 depends on XEN_BACKEND
138 The PCI device backend driver allows the kernel to export arbitrary
139 PCI devices to other guests. If you select this to be a module, you
140 will need to make sure no other driver has bound to the device(s)
141 you want to make visible to other guests.
143 The parameter "passthrough" allows you specify how you want the PCI
144 devices to appear in the guest. You can choose the default (0) where
145 PCI topology starts at 00.00.0, or (1) for passthrough if you want
146 the PCI devices topology appear the same as in the host.
148 The "hide" parameter (only applicable if backend driver is compiled
149 into the kernel) allows you to bind the PCI devices to this module
150 from the default device drivers. The argument is the list of PCI BDFs:
151 xen-pciback.hide=(03:00.0)(04:00.0)