Implied by QEMU >= 1.2.0.
Delete this one first, because QEMU_CAPS_NODEFCONFIG is only used
when QEMU_CAPS_NO_USER_CONFIG is unsupported.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
We require QEMU >= 1.5.0, assume every QEMU supports it.
Sadly that does not let us trivially drop qemuMonitor's
priv->monJSON bool, because of qemuDomainQemuAttach.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Now that we assume QEMU_CAPS_NETDEV, the only thing left to check
is whether we need to use the legacy -net syntax because of
a non-conforming armchitecture.
Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Up until now we have only formatted non-default GIC versions on
the command line, in order to maintain compatibility with older
QEMU versions that didn't implement the gic-version option to
begin with; however, doing so is entirely unnecessary for newer
QEMU versions, where the option is available. Moreover, having
the GIC version formatted on the command line at all times
ensures that QEMU changing its own defaults doesn't affect the
ABI of libvirt guests.
A few test cases are removed to avoid extra churn. It doesn't
matter for coverage, as those scenarios are already covered by
other parts of the test suite.
This patch is better viewed with 'git show -w'.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The new controller will not yet be used automatically by
libvirt, but at this point it's already possible to configure
a guest to use it.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
The qemu command line generator code set disk caching of shareable disks
to 'none' when formatting the command line silently. Move this code to a
common place when preparing the domain definition for startup so that it
does not have to be duplicated.
The new test case shows that the actual cache mode will now be recorded
in the live XML definition.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
The old qcow2 encryption format was buggy, so the new approach is to use
luks inside qcow2. As it turns out, it didn't require that many changes.
It was necessary to fix the command line formatter to stop mangling the
format when secrets are present and specify the encryption format and
secret in correct format.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
For some reason we've decided to silently translate the disk
detect_zeroes mode if it would be invalid. Extract the
logic so that it does not need to be copypasta'd across the code base.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
It was not possible to determine whether virJSONValueObjectAddVArgs and
the functions using it would consume a virJSONValue or not when used
with the 'a' or 'A' modifier depending on when the loop failed.
Fix this by passing in a pointer to the pointer so that it can be
cleared once it's successfully consumed and the callers don't have to
second-guess leaving a chance of leaking or double freeing the value
depending on the ordering.
Fix all callers to pass a double pointer too.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
QEMU on S390 (since v2.11) can support virtio input ccw devices.
So build the qemu command line for ccw devices.
Also add test cases for virtio-{keyboard, mouse, tablet}-ccw.
Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>
Signed-off-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
QEMU on S390 (since v2.11) can support the virtio-gpu-ccw device,
which can be used as a video device.
Signed-off-by: Farhan Ali <alifm@linux.vnet.ibm.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1558317
Similarly to b133fac356 we need to look up alias of CCID
controller when constructing smartcard command line instead of
relying on broken assumption it will always be 'ccid0'. After
user aliases it can be anything.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1552127
When building command line for USB controllers we have to do more
than just put controller's alias onto the command line. QEMU has
concept of these joined USB controllers. For instance ehci and
uhci controllers need to create the same USB bus. To achieve that
the slave controller needs to refer the master controller. This
worked until we've introduced user aliases because both master
and slave had the same alias. With user aliases slave can have
different alias than master. Therefore, when generating command
line for slave we need to look up the master's alias.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Ensure all enum cases are listed in switch statements, or cast away
enum type in places where we don't wish to cover all cases.
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The controller model is slightly unusual in that the default value is
-1, not 0. As a result the default value is not covered by any of the
existing enum cases. This in turn means that any switch() statements
that think they have covered all cases, will in fact not match the
default value at all. In the qemuDomainDeviceCalculatePCIConnectFlags()
method this has caused a serious mistake where we fallthrough from the
SCSI controller case, to the VirtioSerial controller case, and from
the USB controller case to the IDE controller case.
By adding explicit enum constant starting at -1, we can ensure switches
remember to handle the default case.
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
There's no need to perform checks before conversion, we can just
call virDomainControllerPCIModelNameTypeToString() and check the
results later on.
Since the variables involved are only used for PCI controllers,
we can declare them in the 'case' scope rather than in the
function scope to make everything a bit nicer while at it.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Performing the skip earlier will help us making the function
nicer later on. We also make the condition for the skip a bit
more precise, though that'a more for self-documenting purposes
and doesn't change anything in practice.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
This wires up the previously added Chassis strings XML schema to be able to
generate comamnd line args for QEMU. This requires QEMU >= 2.1 release
containing this patch:
SMBIOS: Build aggregate smbios tables and entry point
https://git.qemu.org/?p=qemu.git;a=commit;h=c97294ec1b9e36887e119589d456557d72ab37b5
Signed-off-by: Zhuang Yanying <ann.zhuangyanying@huawei.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Instead of storing separately whether the feature is enabled
or not and what resizing policy should be used, store both of
them in a single place.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Instead of storing separately whether the feature is enabled
or not and what driver should be used, store both of them in
a single place.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Keep them along with other arch/machine type checks for
features instead of waiting until command line generation
time.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This reverts commit 038eb472a0.
On reflection adding defaults for arbitrary guest XML device config
settings to the qemu.conf is not a sustainable path. Removing the
support for rx/tx queue size so that it doesn't set a bad precedent.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
The floppy command formatting is special-cased since it does not
directly translate to a single '-device' argument.
Move the code from qemuBuildDiskDriveCommandLine to a new helper
function so that all the related code is together.
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Several PCI controllers have the same options, and thus
can be handled together.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Loadable drivers must never depend on each other. Over time some usage
mistakenly crept in for the storage and network drivers, but now this is
eliminated the syntax-check rules can enforce this separation once more.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Use a switch statement instead of if-else-if statements. Move the
command line building of the iothread attribute into the common path
as the SCSI controller attributes are already validated.
Signed-off-by: Marc Hartmayer <mhartmay@linux.vnet.ibm.com>
Move the SATA controller check from command line building to
controller def validation. This includes copying the SATA
skip check found in qemuBuildSkipController.
Move the qemuCaps checks over to qemuDomainControllerDefValidatePCI.
This requires two test updates in order to set the correct capability
bit for an xml2xml test as well as setting up the similar capability
for the pseries memlocktest.
Excluding the qemuCaps checks, move the remainder of the checks
that validate whether the PCI definition is valid or not into
qemuDomainControllerDefValidatePCI.
Similar to the checking the modelName vs. NAME_NONE, let's make the
ModelNameTypeToString check more generic too within the checking done
in controller validation (with the same ignore certain models.
NB: We need to keep the ModelNameTypeToString fetch in command line
validation since we use it, but at least we can assume it returns
something valid now.
Move the various modelName == NAME_NONE from the command line
generation into domain controller validation. Also rather than
have multiple cases with the same check, let's make the code
more generic, but also note that it was the modelName option
that caused the failure. We also have to be sure not to check
the PCI models that we don't care about.
For the remaining checks in command line building, we can use
the field name in the error message to be more specific about
what causes the failure.
We format the 'chassis' and 'port' properties on the QEMU command
line later on, so we should make sure they've been set.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Move PCI validation checks out of qemu_command into the proper
qemu_domain validation helper.
Since there's a lot to move, we'll start slow by replicating the
pcie-root and pci-root avoidance from qemuBuildSkipController and
the first switch found in qemuBuildControllerDevStr.
Move SCSI validation from qemu_command into qemu_domain.
Rename/reorder the args in qemuCheckSCSIControllerIOThreads
to match the caller as well as fixing up the comments to
remove the previously removed qemuCaps arg.
Modify the SCSI controller switch during command line building
to account for all virDomainControllerModelSCSI types rather
than using the default label.
Move the checks that various attributes are not set on any controller
other than SCSI controller using virtio-scsi model into the common
controller validate checks.
In 2074ef6cd4 and c56cdf259 (and friends) we've added two
attributes to virtio NICs: rx_queue_size and tx_queue_size.
However, sysadmins might want to set these on per-host basis but
don't necessarily have an access to domain XML (e.g. because they
are generated by some other app). So let's expose them under
qemu.conf (the settings from domain XML still take precedence as
they are more specific ones).
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Now that the controller model is updated during post parse callback,
this code no longer needs to fetch the model based on the capabilities
and can just return the model directly if the controller is found.
Removal of @qemuCaps cascades through various callers which are now
updated to not pass the capabilities.
Now that post parse processing handles setting the SCSI controller
model, there's no need to call qemuDomainGetSCSIControllerModel to
get the "default controller" when building the command line controller
string or when assigning the spaprvio address since the controller
model value will already be filled in.
Rename and rework qemuDomainSetSCSIControllerModel since we're
really not setting the SCSI controller model. Instead the code
is either returning the existing SCSI controller model value, the
default value based on the capabilities, or -1 with the error set.
Rather than repeat multiple steps in order to find the SCSI
controller model, let's combine them into one helper that will
return either the model from the definition or the default
model based on the capabilities.
This patch adds an extra check/error that the controller
that's being found actually exists. This just clarifies that
the error was because the controller doesn't exist rather
than the more generic error that we were unable to determine
the model from qemuDomainSetSCSIControllerModel when a -1
was passed in and the capabilities were unable to find one.
As it turns out virDomainDeviceFindControllerModel was only ever
called for SCSI controllers using VIR_DOMAIN_CONTROLLER_TYPE_SCSI
as a parameter.
So rename to virDomainDeviceFindSCSIController and rather than
return a model, let's return a virDomainControllerDefPtr to let
the caller reference whatever it wants.
Rather than one function serving two purposes, let's split out the
else condition which is checking whether the model can be used
during command line building based on the capabilities.
Signed-off-by: John Ferlan <jferlan@redhat.com>
This wires up the previously added OEM strings XML schema to be able to
generate comamnd line args for QEMU. This requires QEMU >= 2.12 release
containing this patch:
commit 2d6dcbf93fb01b4a7f45a93d276d4d74b16392dd
Author: Daniel P. Berrange <berrange@redhat.com>
Date: Sat Oct 28 21:51:36 2017 +0100
smbios: support setting OEM strings table
Reviewed-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
When the -machine pseries,max-cpu-compat=X is supported use
machine parameter instead of -cpu host,compat=X parameter as
that is deprecated now with qemu >= v2.10.
Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1519146
Signed-off-by: Shivaprasad G Bhat <sbhat@linux.vnet.ibm.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
ebtables/iptables processing is skipped for any interface connected to
Open vSwitch (they have their own packet filtering), likewise for
midonet (according to
http://blog.midokura.com/2016/04/midonet-rule-chains), but libvirt
would allow adding a <filterref> to interfaces connected in these
ways, so the user might mistakenly believe they were being protected.
This patch checks for a non-NULL <virtualport> element for an
interface (or its network) and logs an error if <virtualport> and
<filterref> are both present. This could cause some previously working
domains to no longer start, but that's really the whole point of this
patch - to warn people that their filterref isn't protecting them as
they might have thought.
I don't bother checking this during post-parse validation, because
such a check would be incomplete - it's possible that a network would
have a <virtualport> that would be applied to an interface, and you
can't know that until the domain is started.
Resolves: https://bugzilla.redhat.com/1502754
Move the IDE controller check from command line building to
controller def validation. Also explicitly include the avoidance
check for the implicit IDE controller from qemuBuildSkipController.
Cause the IDE case for command line building to generate a
failure if called to add an IDE since that shouldn't happen
if the Validate code did the right thing.
Move the call to qemuDomainCheckCCWS390AddressSupport from
qemuBuildControllerDevStr to qemuDomainDeviceDefValidateController.
This means we will get the qemuCaps from the driver opaque
variable passed to qemuDomainDeviceDefValidate.
For some corner cases, virQEMUCapsHasPCIMultiBus depends on the QEMU
version, which is by design not stored in the status XML and therefore
it cannot be fixed for all existing running domains.
Prefer the controller alias read from the status XML when formatting
PCI addresses and only fall back to using virQEMUCapsHasPCIMultiBus
if the alias is a user alias.
This fixes hotplug after daemon restart for domains not using user
aliases.
Partially reverts commit 937f3195.
https://bugzilla.redhat.com/show_bug.cgi?id=1518148
Even though we never format the device on the QEMU command line,
as it's a platform serial device that's not user-instantiable,
we should still make sure it's available before using it.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
We should make sure the isa-serial device is available before
formatting it on the QEMU command line.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Introduce specific a target types with two models for the console
devices (sclp and sclplm) used in s390 and s390x guests, so isa-serial
is no more used for them.
This makes <serial> usable on s390 and s390x guests, with at most only
a single sclpconsole and one sclplmconsole devices usable in a single
guest (due to limitations in QEMU, which will enforce already at
runtime).
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1449265
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
We can finally introduce a specific target model for the pl011 device
used by mach-virt guests, which means isa-serial will no longer show
up to confuse users.
We make sure migration works in both directions by interpreting the
isa-serial target type, or the lack of target type, appropriately
when parsing the guest XML, and skipping the newly-introduced type
when formatting if for migration. We also verify that pl011 is not
used for non-mach-virt guests and add a bunch of test cases.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=151292
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
The existing implementation set the address type for all serial
devices to spapr-vio, which made it impossible to use other devices
such as usb-serial and pci-serial; moreover, some decisions were
made based on the address type rather than the device type.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1512934
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
We can finally introduce a specific target model for the spapr-vty
device used by pSeries guests, which means isa-serial will no longer
show up to confuse users.
We make sure migration works in both directions by interpreting the
isa-serial target type, or the lack of target type, appropriately
when parsing the guest XML, and skipping the newly-introduced type
when formatting if for migration. We also verify that spapr-vty is
not used for non-pSeries guests and add a bunch of test cases.
This commit is best viewed with 'git show -w'.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1511421
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Instead duplicating the capability check for each possible target
model, introduce a small helper that matches the target model with
the corresponding capability and collapse all existing checks into
a single one.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Now that we've created a distinction between target type and target
model, with the latter being the concrete device name, it's time to
switch to formatting the model instead of the type.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Instead of waiting until we get to command line generation, we can
validate the target for a char device much earlier.
Move all the checks out of qemuBuildSerialChrDeviceStr() and into
the new fuction. This will later allow us to validate the target
for platform devices.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
This is the first step in getting rid of the assumption that
isa-serial is the default target type for serial devices.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1425757
The blockdev-add code provides a mechanism to sanely provide user
and password-secret arguments for iscsi without placing them on the
command line to be viewable by a 'ps -ef' type command or needing
to create separate -iscsi devices for each disk/volume found.
So modify the iSCSI command line building to check for the presence
of the capability in order properly setup and use the domain master
secret object to encrypt the password in a secret object and alter
the parameters for the command line to utilize.
Modify the xml2argvtest to exhibit the syntax for both disk and
hostdev configurations.
Rather than picking apart the two pieces we need/want (path, hosts,
and auth)- let's allocate/use a virStorageSourcePtr for iSCSI storage.
The end result is that qemuBuildSCSIiSCSIHostdevDrvStr doesn't need
to "fake" one for the qemuBuildNetworkDriveStr call.
Move the setup of the disk attribute to the disk source prepare function
which will allow proper usage with JSON props and move the fallback
(legacy) generating code into the block which is executed with legacy
options.
As a side-effect of this change we can clean up propagation of 'cfg'
into the command generator.
Also it's nice to see that the test output is the same even when the
value is generated in a different place.
The 'file.password-secret' injection should be used only if we are using
the old formatter. When formatting the source string from the JSON
properties, the property should be added there.
Also drop the comment which refers to stuff that will not be used in
libvirt since -blockdev is the way to go.
Qemu has now an internal mechanism for locking images to fix specific
cases of disk corruption. This requires libvirt to mark the image as
shared so that qemu lifts certain restrictions.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1378242
Since we already have such support for libxl all we need is qemu
driver adjustment. And a test case.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Historically we've formatted a lot of the attributes of a disk (disk
geometry, etc) with -drive. Since we use -device now, they should be
formatted there. Extract them to a separate function for keeping
compatibility with SDcards which still use only -drive.
Start this by moving the geometry into a separate function.
https://bugzilla.redhat.com/show_bug.cgi?id=1434451
Just like in 9324f67a57 we need to put default sata alias
(which is hardcoded to "ide", obvious, right?) onto the command
line instead of the one provided by user.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
The compiler can warn us if we add a value to the
virDomainChrSerialTargetType enumeration but forget to handle
it properly in the code. Let's take advantage of that.
This commit is best viewed with 'git diff -w'.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Add a separate capability for the sclplmconsole device, and check it
specifically instead of using QEMU_CAPS_DEVICE_SCLPCONSOLE for that too.
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Give a better name to the capability for the sclpconsole device.
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
Up until now we assumed the spapr-vty device would always be
present, which is not very nice. Check for its availability before
using it instead.
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Starting from qemu 2.11, the `-device vmcoreinfo` will create a fw_cfg
entry for a guest to store dump details, necessary to process kernel
dump with KASLR enabled and providing additional kernel details.
In essence, it is similar to -fw_cfg name=etc/vmcoreinfo,file=X but in
this case it is not backed by a file, but collected by QEMU itself.
Since the device is a singleton and shouldn't use additional hardware
resources, it is presented as a <feature> element in the libvirt
domain XML.
The device is arm/x86 only for now (targets that support fw_cfg+dma).
Related to:
https://bugzilla.redhat.com/show_bug.cgi?id=1395248
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Most of the time it's okay to leave this up to negotiation between
the guest and the host, but in some situations it can be useful to
manually decide the behavior, especially to enforce its availability.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1308743
Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
In some cases it does not make sense to pursue that the private data
will be allocated (especially when we don't need to put anything in it).
Ensure that the code works without it.
This also fixes few crashes pointed out in
https://bugzilla.redhat.com/show_bug.cgi?id=1510323
https://bugzilla.redhat.com/show_bug.cgi?id=1434451
When testing user aliases it was discovered that for 440fx
machine type which has default IDE bus builtin, domain cannot
start if IDE controller has the user provided alias. This is
because for 440fx we don't put the IDE controller onto the
command line (since it is builtin) and therefore any device that
is plugged onto the bus must use the default alias.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
In some cases management application needs to allocate memory for
qemu upfront and then just let qemu use that. Since we don't want
to expose path for memory-backend-file anywhere in the domain
XML, we can generate predictable paths. In this case:
$memoryBackingDir/libvirt/qemu/$shortName/$alias
where $shortName is result of virDomainDefGetShortName().
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Very soon qemuBuildMemoryBackendStr() is going to use memory cell
aliases. Therefore set one. At the same time, move it a bit
further - if virAsprintf() fails, there's no point in setting
rest of the members.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
Extract the part formatting the basic URI part so that it can be reused
to format JSON backing definitions. Parts specific to the command line
format will remain in qemuBuildNetworkDriveURI. The new function is
called qemuBlockStorageSourceGetURI.
