| menu "Xen driver support" |
| depends on XEN |
| |
| config XEN_BALLOON |
| bool "Xen memory balloon driver" |
| default y |
| help |
| The balloon driver allows the Xen domain to request more memory from |
| the system to expand the domain's memory allocation, or alternatively |
| return unneeded memory to the system. |
| |
| config XEN_SELFBALLOONING |
| bool "Dynamically self-balloon kernel memory to target" |
| depends on XEN && XEN_BALLOON && CLEANCACHE && SWAP && XEN_TMEM |
| default n |
| help |
| Self-ballooning dynamically balloons available kernel memory driven |
| by the current usage of anonymous memory ("committed AS") and |
| controlled by various sysfs-settable parameters. Configuring |
| FRONTSWAP is highly recommended; if it is not configured, self- |
| ballooning is disabled by default but can be enabled with the |
| 'selfballooning' kernel boot parameter. If FRONTSWAP is configured, |
| frontswap-selfshrinking is enabled by default but can be disabled |
| with the 'noselfshrink' kernel boot parameter; and self-ballooning |
| is enabled by default but can be disabled with the 'noselfballooning' |
| kernel boot parameter. Note that systems without a sufficiently |
| large swap device should not enable self-ballooning. |
| |
| config XEN_BALLOON_MEMORY_HOTPLUG |
| bool "Memory hotplug support for Xen balloon driver" |
| default n |
| depends on XEN_BALLOON && MEMORY_HOTPLUG |
| help |
| Memory hotplug support for Xen balloon driver allows expanding memory |
| available for the system above limit declared at system startup. |
| It is very useful on critical systems which require long |
| run without rebooting. |
| |
| Memory could be hotplugged in following steps: |
| |
| 1) dom0: xl mem-max <domU> <maxmem> |
| where <maxmem> is >= requested memory size, |
| |
| 2) dom0: xl mem-set <domU> <memory> |
| where <memory> is requested memory size; alternatively memory |
| could be added by writing proper value to |
| /sys/devices/system/xen_memory/xen_memory0/target or |
| /sys/devices/system/xen_memory/xen_memory0/target_kb on dumU, |
| |
| 3) domU: for i in /sys/devices/system/memory/memory*/state; do \ |
| [ "`cat "$i"`" = offline ] && echo online > "$i"; done |
| |
| Memory could be onlined automatically on domU by adding following line to udev rules: |
| |
| SUBSYSTEM=="memory", ACTION=="add", RUN+="/bin/sh -c '[ -f /sys$devpath/state ] && echo online > /sys$devpath/state'" |
| |
| In that case step 3 should be omitted. |
| |
| config XEN_SCRUB_PAGES |
| bool "Scrub pages before returning them to system" |
| depends on XEN_BALLOON |
| default y |
| help |
| Scrub pages before returning them to the system for reuse by |
| other domains. This makes sure that any confidential data |
| is not accidentally visible to other domains. Is it more |
| secure, but slightly less efficient. |
| If in doubt, say yes. |
| |
| config XEN_DEV_EVTCHN |
| tristate "Xen /dev/xen/evtchn device" |
| default y |
| help |
| The evtchn driver allows a userspace process to triger event |
| channels and to receive notification of an event channel |
| firing. |
| If in doubt, say yes. |
| |
| config XEN_BACKEND |
| bool "Backend driver support" |
| depends on XEN_DOM0 |
| default y |
| help |
| Support for backend device drivers that provide I/O services |
| to other virtual machines. |
| |
| config XENFS |
| tristate "Xen filesystem" |
| select XEN_PRIVCMD |
| default y |
| help |
| The xen filesystem provides a way for domains to share |
| information with each other and with the hypervisor. |
| For example, by reading and writing the "xenbus" file, guests |
| may pass arbitrary information to the initial domain. |
| If in doubt, say yes. |
| |
| config XEN_COMPAT_XENFS |
| bool "Create compatibility mount point /proc/xen" |
| depends on XENFS |
| default y |
| help |
| The old xenstore userspace tools expect to find "xenbus" |
| under /proc/xen, but "xenbus" is now found at the root of the |
| xenfs filesystem. Selecting this causes the kernel to create |
| the compatibility mount point /proc/xen if it is running on |
| a xen platform. |
| If in doubt, say yes. |
| |
| config XEN_SYS_HYPERVISOR |
| bool "Create xen entries under /sys/hypervisor" |
| depends on SYSFS |
| select SYS_HYPERVISOR |
| default y |
| help |
| Create entries under /sys/hypervisor describing the Xen |
| hypervisor environment. When running native or in another |
| virtual environment, /sys/hypervisor will still be present, |
| but will have no xen contents. |
| |
| config XEN_XENBUS_FRONTEND |
| tristate |
| |
| config XEN_GNTDEV |
| tristate "userspace grant access device driver" |
| depends on XEN |
| default m |
| select MMU_NOTIFIER |
| help |
| Allows userspace processes to use grants. |
| |
| config XEN_GRANT_DEV_ALLOC |
| tristate "User-space grant reference allocator driver" |
| depends on XEN |
| default m |
| help |
| Allows userspace processes to create pages with access granted |
| to other domains. This can be used to implement frontend drivers |
| or as part of an inter-domain shared memory channel. |
| |
| config SWIOTLB_XEN |
| def_bool y |
| depends on PCI |
| select SWIOTLB |
| |
| config XEN_TMEM |
| bool |
| default y if (CLEANCACHE || FRONTSWAP) |
| help |
| Shim to interface in-kernel Transcendent Memory hooks |
| (e.g. cleancache and frontswap) to Xen tmem hypercalls. |
| |
| config XEN_PCIDEV_BACKEND |
| tristate "Xen PCI-device backend driver" |
| depends on PCI && X86 && XEN |
| depends on XEN_BACKEND |
| default m |
| help |
| The PCI device backend driver allows the kernel to export arbitrary |
| PCI devices to other guests. If you select this to be a module, you |
| will need to make sure no other driver has bound to the device(s) |
| you want to make visible to other guests. |
| |
| The parameter "passthrough" allows you specify how you want the PCI |
| devices to appear in the guest. You can choose the default (0) where |
| PCI topology starts at 00.00.0, or (1) for passthrough if you want |
| the PCI devices topology appear the same as in the host. |
| |
| The "hide" parameter (only applicable if backend driver is compiled |
| into the kernel) allows you to bind the PCI devices to this module |
| from the default device drivers. The argument is the list of PCI BDFs: |
| xen-pciback.hide=(03:00.0)(04:00.0) |
| |
| If in doubt, say m. |
| |
| config XEN_PRIVCMD |
| tristate |
| depends on XEN |
| default m |
| |
| config XEN_ACPI_PROCESSOR |
| tristate "Xen ACPI processor" |
| depends on XEN && X86 && ACPI_PROCESSOR |
| default y if (X86_ACPI_CPUFREQ = y || X86_POWERNOW_K8 = y) |
| default m if (X86_ACPI_CPUFREQ = m || X86_POWERNOW_K8 = m) |
| help |
| This ACPI processor uploads Power Management information to the Xen hypervisor. |
| |
| To do that the driver parses the Power Management data and uploads said |
| information to the Xen hypervisor. Then the Xen hypervisor can select the |
| proper Cx and Pxx states. It also registers itslef as the SMM so that |
| other drivers (such as ACPI cpufreq scaling driver) will not load. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called xen_acpi_processor If you do not know what to choose, |
| select M here. If the CPUFREQ drivers are built in, select Y here. |
| |
| endmenu |
