1menu "Xen driver support" 2 depends on XEN 3 4config XEN_BALLOON 5 bool "Xen memory balloon driver" 6 default y 7 help 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. 11 12config XEN_SELFBALLOONING 13 bool "Dynamically self-balloon kernel memory to target" 14 depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP 15 default n 16 help 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. 28 29config XEN_SCRUB_PAGES 30 bool "Scrub pages before returning them to system" 31 depends on XEN_BALLOON 32 default y 33 help 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. 38 If in doubt, say yes. 39 40config XEN_DEV_EVTCHN 41 tristate "Xen /dev/xen/evtchn device" 42 default y 43 help 44 The evtchn driver allows a userspace process to triger event 45 channels and to receive notification of an event channel 46 firing. 47 If in doubt, say yes. 48 49config XEN_BACKEND 50 bool "Backend driver support" 51 depends on XEN_DOM0 52 default y 53 help 54 Support for backend device drivers that provide I/O services 55 to other virtual machines. 56 57config XENFS 58 tristate "Xen filesystem" 59 default y 60 help 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. 65 If in doubt, say yes. 66 67config XEN_COMPAT_XENFS 68 bool "Create compatibility mount point /proc/xen" 69 depends on XENFS 70 default y 71 help 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 76 a xen platform. 77 If in doubt, say yes. 78 79config XEN_SYS_HYPERVISOR 80 bool "Create xen entries under /sys/hypervisor" 81 depends on SYSFS 82 select SYS_HYPERVISOR 83 default y 84 help 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. 89 90config XEN_XENBUS_FRONTEND 91 tristate 92 93config XEN_GNTDEV 94 tristate "userspace grant access device driver" 95 depends on XEN 96 default m 97 select MMU_NOTIFIER 98 help 99 Allows userspace processes to use grants. 100 101config XEN_GRANT_DEV_ALLOC 102 tristate "User-space grant reference allocator driver" 103 depends on XEN 104 default m 105 help 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. 109 110config XEN_PLATFORM_PCI 111 tristate "xen platform pci device driver" 112 depends on XEN_PVHVM && PCI 113 default m 114 help 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 118 frontend on Xen HVM. 119 120config SWIOTLB_XEN 121 def_bool y 122 depends on PCI 123 select SWIOTLB 124 125endmenu 126