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 && XEN_TMEM 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_BALLOON_MEMORY_HOTPLUG 30 bool "Memory hotplug support for Xen balloon driver" 31 default n 32 depends on XEN_BALLOON && MEMORY_HOTPLUG 33 help 34 Memory hotplug support for Xen balloon driver allows expanding memory 35 available for the system above limit declared at system startup. 36 It is very useful on critical systems which require long 37 run without rebooting. 38 39 Memory could be hotplugged in following steps: 40 41 1) dom0: xl mem-max <domU> <maxmem> 42 where <maxmem> is >= requested memory size, 43 44 2) dom0: xl mem-set <domU> <memory> 45 where <memory> is requested memory size; alternatively memory 46 could be added by writing proper value to 47 /sys/devices/system/xen_memory/xen_memory0/target or 48 /sys/devices/system/xen_memory/xen_memory0/target_kb on dumU, 49 50 3) domU: for i in /sys/devices/system/memory/memory*/state; do \ 51 [ "`cat "$i"`" = offline ] && echo online > "$i"; done 52 53 Memory could be onlined automatically on domU by adding following line to udev rules: 54 55 SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'" 56 57 In that case step 3 should be omitted. 58 59config XEN_SCRUB_PAGES 60 bool "Scrub pages before returning them to system" 61 depends on XEN_BALLOON 62 default y 63 help 64 Scrub pages before returning them to the system for reuse by 65 other domains. This makes sure that any confidential data 66 is not accidentally visible to other domains. Is it more 67 secure, but slightly less efficient. 68 If in doubt, say yes. 69 70config XEN_DEV_EVTCHN 71 tristate "Xen /dev/xen/evtchn device" 72 default y 73 help 74 The evtchn driver allows a userspace process to triger event 75 channels and to receive notification of an event channel 76 firing. 77 If in doubt, say yes. 78 79config XEN_BACKEND 80 bool "Backend driver support" 81 depends on XEN_DOM0 82 default y 83 help 84 Support for backend device drivers that provide I/O services 85 to other virtual machines. 86 87config XENFS 88 tristate "Xen filesystem" 89 select XEN_PRIVCMD 90 default y 91 help 92 The xen filesystem provides a way for domains to share 93 information with each other and with the hypervisor. 94 For example, by reading and writing the "xenbus" file, guests 95 may pass arbitrary information to the initial domain. 96 If in doubt, say yes. 97 98config XEN_COMPAT_XENFS 99 bool "Create compatibility mount point /proc/xen" 100 depends on XENFS 101 default y 102 help 103 The old xenstore userspace tools expect to find "xenbus" 104 under /proc/xen, but "xenbus" is now found at the root of the 105 xenfs filesystem. Selecting this causes the kernel to create 106 the compatibility mount point /proc/xen if it is running on 107 a xen platform. 108 If in doubt, say yes. 109 110config XEN_SYS_HYPERVISOR 111 bool "Create xen entries under /sys/hypervisor" 112 depends on SYSFS 113 select SYS_HYPERVISOR 114 default y 115 help 116 Create entries under /sys/hypervisor describing the Xen 117 hypervisor environment. When running native or in another 118 virtual environment, /sys/hypervisor will still be present, 119 but will have no xen contents. 120 121config XEN_XENBUS_FRONTEND 122 tristate 123 124config XEN_GNTDEV 125 tristate "userspace grant access device driver" 126 depends on XEN 127 default m 128 select MMU_NOTIFIER 129 help 130 Allows userspace processes to use grants. 131 132config XEN_GRANT_DEV_ALLOC 133 tristate "User-space grant reference allocator driver" 134 depends on XEN 135 default m 136 help 137 Allows userspace processes to create pages with access granted 138 to other domains. This can be used to implement frontend drivers 139 or as part of an inter-domain shared memory channel. 140 141config SWIOTLB_XEN 142 def_bool y 143 depends on PCI 144 select SWIOTLB 145 146config XEN_TMEM 147 bool 148 default y if (CLEANCACHE || FRONTSWAP) 149 help 150 Shim to interface in-kernel Transcendent Memory hooks 151 (e.g. cleancache and frontswap) to Xen tmem hypercalls. 152 153config XEN_PCIDEV_BACKEND 154 tristate "Xen PCI-device backend driver" 155 depends on PCI && X86 && XEN 156 depends on XEN_BACKEND 157 default m 158 help 159 The PCI device backend driver allows the kernel to export arbitrary 160 PCI devices to other guests. If you select this to be a module, you 161 will need to make sure no other driver has bound to the device(s) 162 you want to make visible to other guests. 163 164 The parameter "passthrough" allows you specify how you want the PCI 165 devices to appear in the guest. You can choose the default (0) where 166 PCI topology starts at 00.00.0, or (1) for passthrough if you want 167 the PCI devices topology appear the same as in the host. 168 169 The "hide" parameter (only applicable if backend driver is compiled 170 into the kernel) allows you to bind the PCI devices to this module 171 from the default device drivers. The argument is the list of PCI BDFs: 172 xen-pciback.hide=(03:00.0)(04:00.0) 173 174 If in doubt, say m. 175 176config XEN_PRIVCMD 177 tristate 178 depends on XEN 179 default m 180 181config XEN_ACPI_PROCESSOR 182 tristate "Xen ACPI processor" 183 depends on XEN && X86 && ACPI_PROCESSOR 184 default m 185 help 186 This ACPI processor uploads Power Management information to the Xen hypervisor. 187 188 To do that the driver parses the Power Management data and uploads said 189 information to the Xen hypervisor. Then the Xen hypervisor can select the 190 proper Cx and Pxx states. It also registers itslef as the SMM so that 191 other drivers (such as ACPI cpufreq scaling driver) will not load. 192 193 To compile this driver as a module, choose M here: the 194 module will be called xen_acpi_processor If you do not know what to choose, 195 select M here. If the CPUFREQ drivers are built in, select Y here. 196 197endmenu 198