A mechanism is required to binarily patch the running hypervisor with new
opcodes that have come about due to primarily security updates.
This document describes the design of the API that would allow us to
upload to the hypervisor binary patches.
This document has been shaped by the input from:
Martin Pohlack <mpohlack@amazon.de>
Jan Beulich <jbeulich@suse.com>
Thank you!
Input-from: Martin Pohlack <mpohlack@amazon.de>
Input-from: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
Add a section about what the firmware should do in EL3 before starting Xen.
E.g guest will use HVC instruction to issue hypercall. As this can be set only
at EL3, i.e. outside Xen, document this boot requirement.
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
The command line instructions for FLASK include a note on how to compile
Xen with FLASK but the note was out of date after the change to Kconfig.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
This patch updates the documentation for allowing detection of an XSM
module that lacks a specific compatible string.
This mechanism has been added by the commit
ca32012341.
Signed-off-by: Fu Wei <fu.wei@linaro.org>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Julien Grall <julien.grall@arm.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
The previous default of "permissive" is meant for developing or
debugging a disaggregated system. However, this default makes it too
easy to accidentally boot a machine in this state, which does not place
any restrictions on guests. This is not suitable for normal systems
because any guest can perform any operation (including operations like
rebooting the machine, kexec, and reading or writing another domain's
memory).
This change will cause the boot to fail if you do not specify an XSM
policy during boot; if you need to load a policy from dom0, use the
"flask=late" boot parameter.
Original patch by Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>; modified
to also change the default value of flask_enforcing so that the policy
is not still in permissive mode. This also removes the (no longer
documented) command line argument directly changing that variable since
it has been superseded by the flask= parameter.
Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
In fact, credit2 uses CPU topology to decide how to arrange
its internal runqueues. Before this change, only 'one runqueue
per socket' was allowed. However, experiments have shown that,
for instance, having one runqueue per physical core improves
performance, especially in case hyperthreading is available.
In general, it makes sense to allow users to pick one runqueue
arrangement at boot time, so that:
- more experiments can be easily performed to even better
assess and improve performance;
- one can select the best configuration for his specific
use case and/or hardware.
This patch enables the above.
Note that, for correctly arranging runqueues to be per-core,
just checking cpu_to_core() on the host CPUs is not enough.
In fact, cores (and hyperthreads) on different sockets, can
have the same core (and thread) IDs! We, therefore, need to
check whether the full topology of two CPUs matches, for
them to be put in the same runqueue.
Note also that the default (although not functional) for
credit2, since now, has been per-socket runqueue. This patch
leaves things that way, to avoid mixing policy and technical
changes.
Finally, it would be a nice feature to be able to select
a particular runqueue arrangement, even when creating a
Credit2 cpupool. This is left as future work.
Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Signed-off-by: Uma Sharma <uma.sharma523@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Add the FreeBSD disk hotplug interface details to the block-scripts.txt
document.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Add a new pvusb backend type "qusb" which is provided by qemu. It can
be selected either by specifying the type directly in the configuration
or it is selected automatically by libxl in case there is no "usbback"
driver loaded.
The "qusb" backend is a full replacement for the kernel based backend
"vusb". The interface to the frontend is the very same including all
Xenstore paths, while the backend paths in Xenstore differ ("qusb"
instead ov "vusb").
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Add a function to query whether the device model is supporting a
specific backend type. The device model is writing the supported
backend types to Xenstore on startup. The new query function checks
for the appropriate entry to be present.
As not all versions of qemu are capable to indicate support of
specific backends the query function is to be called with an indicator
whether the default return value should be "supported" (in case qemu
doesn't know set any support information) or "not supported".
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
The patches adding Xen tools support for paravirtualized USB devices
(pvUSB) omitted documenting the introduced Xenstore paths.
Add the paths to docs/misc/xenstore-paths.markdown
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
The hyperlinks for the different I/O protocols are wrong.
Correct them.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Add cmdline switches to 'xl migrate-receive' command to specify
a domain-specific hotplug script to setup COLO proxy.
Add a new config var 'colo.default.agentscript' to xl.conf, that
allows the user to override the default global script used to
setup COLO proxy.
Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Add a new option -c to the command 'xl remus'. If you want
to use COLO HA instead of Remus HA, please use -c option.
Update man pages to reflect the addition of a new option to
'xl remus' command.
Also add a new option --colo to the internal command 'xl migrate-receive'.
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Yang Hongyang <hongyang.yang@easystack.cn>
Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Create a DT for Dom0 for ACPI-case only. DT contains minimal required
information such as Dom0 bootargs, initrd, efi description table and
address of uefi memory table.
Also document this device tree bindings of "hypervisor" and
"hypervisor/uefi" node.
Signed-off-by: Naresh Bhat <naresh.bhat@linaro.org>
Signed-off-by: Parth Dixit <parth.dixit@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Julien Grall <julien.grall@arm.com>
This patch adds code to enable the APIC assist enlightenment which,
under certain conditions, means that the guest can avoid an EOI of
the local APIC and thereby avoid a VMEXIT.
Use of the enlightenment by the hypervisor is under control of the
toolstack, and is added to the default set.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Add pvusb commands: usbctrl-attach, usbctrl-detach, usb-list,
usbdev-attach and usbdev-detach.
To attach a usb device to guest through pvusb, one could follow
following example:
#xl usbctrl-attach test_vm version=1 ports=8
#xl usb-list test_vm
will show the usb controllers and port usage under the domain.
#xl usbdev-attach test_vm hostbus=1 hostaddr=2
will find the first usable controller:port, and attach usb
device whose busnum is 1 and devnum is 6.
One could also specify which <controller> and which <port>.
#xl usbdev-detach test_vm 0 1
will detach USB device under controller 0 port 1.
#xl usbctrl-detach test_vm dev_id
will destroy the controller with specified dev_id. Dev_id
can be traced in usb-list info.
Signed-off-by: Chunyan Liu <cyliu@suse.com>
Signed-off-by: Simon Cao <caobosimon@gmail.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Add code to support pvusb in domain config file. One could specify
usbctrl and usb in domain's configuration file and create domain,
then usb controllers will be created and usb device would be attached
to guest automatically.
One could specify usb controllers and usb devices in config file
like this:
usbctrl=['version=2,ports=4', 'version=1, ports=4', ]
usbdev=['hostbus=2, hostaddr=1, controller=0,port=1', ]
Signed-off-by: Chunyan Liu <cyliu@suse.com>
Signed-off-by: Simon Cao <caobosimon@gmail.com>
Reviewed-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
Write down what emulated hardware is supported in qemu-xen. Add a way
for users to ask for a change in the list.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
The printk formats %*ph{C,D,N} are chosen to be compatible with their Linux
counterparts.
Sample:
(XEN) buf: 00 01 03 07 78 65 6e 00
(XEN) buf: 00:01:03:07:78:65:6e:00
(XEN) buf: 00-01-03-07-78-65-6e-00
(XEN) buf: 0001030778656e00
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
We've been told by Intel that inconsistent cachability between
multiple mappings of the same page can affect system stability only
when the affected page is an MMIO one. Since the stale data issue is
of no relevance to the hypervisor (since all guest memory accesses go
through proper accessors and validation), handling of RAM pages
remains unchanged here. Any MMIO mapped by domains however needs to be
done consistently (all cachable mappings or all uncachable ones), in
order to avoid Machine Check exceptions. Since converting existing
cachable mappings to uncachable (at the time an uncachable mapping
gets established) would in the PV case require tracking all mappings,
allow MMIO to only get mapped uncachable (UC, UC-, or WC).
This also implies that in the PV case we mustn't use the L1 PTE update
fast path when cachability flags get altered.
Since in the HVM case at least for now we want to continue honoring
pinned cachability attributes for pages not mapped by the hypervisor,
special case handling of r/o MMIO pages (forcing UC) gets added there.
Arguably the counterpart change to p2m-pt.c may not be necessary, since
UC- (which already gets enforced there) is probably strict enough.
Note that the shadow code changes include fixing the write protection
of r/o MMIO ranges: shadow_l1e_remove_flags() and its siblings, other
than l1e_remove_flags() and alike, return the new PTE (and hence
ignoring their return values makes them no-ops).
This is CVE-2016-2270 / XSA-154.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
This platform is no longer actively used, but it makes GICv2 development
harder.
Signed-off-by: Zoltan Kiss <zoltan.kiss@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
The discussion in [1] lead to an agreement of the missing pieces in PVH
(or HVM without a device-model) in order to progress with it's
implementation.
One of the missing pieces is a new boot ABI, that replaces the PV boot
ABI. The aim of this new boot ABI is to remove the limitations of the
PV boot ABI, that are no longer present when using auto-translated
guests. The new boot protocol should allow to use the same entry point
for both 32bit and 64bit guests, and let the guest choose it's bitness
and paging mode at run time without the domain builder knowing in
advance.
This patch introduces a new document called hvmlite.markdown, with the
intention of merging it into pvh.markdown once the HVMlite implementation
has feature parity with PVH and the old PVH ABI is replaced with the
HVMlite one.
[1] http://lists.xen.org/archives/html/xen-devel/2015-06/msg00258.html
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
gnttab_max_frames incorrectly referred to numbers of grant tab
operations and gnttab_max_maptrack_frames was confusingly worded.
Add the default for gnttab_max_frames while here (it's currently the
same on all arches since no arch uses the available arch override) and
adjust the default for gnttab_max_maptrack_frames to match the normal
form.
Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Add the xenstore domain specific xenstore paths to
docs/misc/xenstore-paths.markdown
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Converts the existing XSM_ENABLE flag from Config.mk to CONFIG_XSM
within Kconfig. This also re-adds the dependency of CONFIG_FLASK on
CONFIG_XSM.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Converts the Config.mk option of FLASK_ENABLE into a Kconfig option for
the hypervisor called CONFIG_FLASK. This commit knowingly breaks the
dependent relationship on XSM_ENABLE which is addressed when XSM_ENABLE
is converted to Kconfig.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
This introduces a way to have a restricted VPMU, by specifying one of two
predefined groups of PMCs to make available. For secure environments, this
allows the VPMU to be used without needing to enable all PMCs.
Signed-off-by: Brendan Gregg <bgregg@netflix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
Converts the existing XSM_ENABLE flag from Config.mk to CONFIG_XSM
within Kconfig. This also re-adds the dependency of CONFIG_FLASK on
CONFIG_XSM.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Converts the Config.mk option of FLASK_ENABLE into a Kconfig option for
the hypervisor called CONFIG_FLASK. This commit knowingly breaks the
dependent relationship on XSM_ENABLE which is addressed when XSM_ENABLE
is converted to Kconfig.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Set the SIF_VIRT_P2M_4TOOLS flag for pv-domUs in the domain builder
to indicate the Xen tools have full support for the virtual mapped
linear p2m list.
This will enable pv-domUs to drop support of the 3 level p2m tree
and use the linear list only. Without setting this flag some kernels
might limit themselves to 512 GB memory size in order not to break
migration.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Import the following files and directories from the Linux v4.3 tag /
commit id 6a13feb9c82803e2b815eca72fa7a9f5561d7861.
- scripts/kconfig -> xen/tools/kconfig
- Documentation/kbuild/kconfig{,-language}.txt ->
docs/misc/kconfig{-language}.txt
- scripts/Makefile.host -> xen/tools/kconfig/Makefile.host
These files are currently unused but will be used shortly.
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Konrad Rzeszutek Wilk
Dirk Behme
Fu Wei
Doug Goldstein
Juergen Gross
Daniel De Graaf
Dario Faggioli
Chong Li
Roger Pau Monne
George Dunlap
Wei Liu
Wen Congyang
Shannon Zhao
Olaf Hering
Paul Durrant
Chunyan Liu
Haozhong Zhang
Feng Wu
Stefano Stabellini
Andrew Cooper
Jim Fehlig
Jan Beulich
Zoltan Kiss
Ian Campbell
Brendan Gregg
Huaitong Han