Until now we would skip loading of the backing chain for files which
don't support backing chains only when starting up the VM. Move the
check from qemuProcessPrepareHostStorage with some adaptations so that's
always applied.

Split out clearing of the backing chain prior to other code since it
will be required later and optimize few layers of nested conditions and
loops.

The graphics code is complex and there are a lot of exceptions and
backward compatible combinations.  One of them is the possibility
to configure "spice_auto_unix_socket" in qemu.conf which will convert
all spice graphics with listen type "address" without any address
specified to listen type "socket" when the guest is started.

We don't format this generated socket into migratable XML to make
migration work with older libvirt.  However, spice has another
exception that if autoport='no' and there is no port configured
it is converted to listen type "none".  Because of this we need
to format autoport='yes' to make sure that the listen type will
be the same as the offline XML.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1511407Reviewed-by: NJiri Denemark <jdenemar@redhat.com>
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

In status XML, we do not store the QEMU version information, we only
format all the capabilities. We dropped QEMU_CAPS_PCI_MULTIBUS
in commit 5b783379 which was released in libvirt 3.2.0.

Therefore the only way of telling if the already running domain
at the time of daemon restart has been started with a QEMU that does
use 'pci.0' or not on PPC is to look at the pci-root controller's
alias. This is not an option if the domain has a user-specified alias
for the pci-root.

Instead of reintroducing the capability, assume 'pci.0' when we have
no version information. That way the only left broken use case would
be the combination of user aliases and very old QEMU.

Partially reverts commit 3a37af1e.

https://bugzilla.redhat.com/show_bug.cgi?id=1518148

We do not fill out qemuCaps->arch when parsing status XML.

Use def->os.arch like we do for PPC.

This fixes hotplug after daemon restart for domains that use
a user alias for the implicit pci-root on x86.

https://bugzilla.redhat.com/show_bug.cgi?id=1518148

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

Allow parts of code outside domain_conf to decide whether the alias
is user-specified or not.

Adjust function descriptions of virQEMUCapsInitCPUModelS390 and
virQEMUCapsInitCPUModel to the changes introduced with
commitID 74fc32a9.
Signed-off-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Reviewed-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.com>
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

All serial devices shoule have an associated capability.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

All serial devices shoule have an associated capability.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Now that <serial> and <console> on s390/s390x behave a bit more like the
other architectures, remove this extra differentation, and use sclp
console by default for new guests.  New virtio consoles can still be
added, and it is actually needed because of the limited number of
instances for sclp and sclplm.

This reverts commit b1c88c14, whose
reasons are not totally clear.
Signed-off-by: NPino Toscano <ptoscano@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NBjoern Walk <bwalk@linux.vnet.ibm.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=1449265Signed-off-by: NPino Toscano <ptoscano@redhat.com>
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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=151292Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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=1512934Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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=1511421Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Target model and target type must agree for the configuration
to make sense, so check that's actually the case and error out
otherwise.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

This information will be used to select, and store in the guest
configuration in order to guarantee ABI stability, the concrete
(hypervisor-specific) model for serial devices.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Instead of validating each target type / address type combination
separately, create a small helper to perform the matching and
collapse all existing checks into a single one.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Formatting the <target/> element for serial devices will become a
bit more complicated later on, and leaving the fallthrough behavior
there would do nothing but complicate it further.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Make the switch statement type-aware, avoid calling
virDomainChrTargetTypeToString() more than once and check its
return value before using it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

The function can fail, but none of the caller were accounting
for that.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

We don't need to store the return value since we never modify it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Move formatting of the <target/> element for char devices out of
virDomainChrDefFormat() and into its own function.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

This attribute was used to decide whether to format the type
attribute of the <target> element, but the logic didn't take into
account all possible cases and as such could lead to unexpected
results. Moreover, it's one more thing to keep track of, and can
easily fall out of sync with other attributes.

Now that we have VIR_DOMAIN_CHR_SERIAL_TARGET_TYPE_NONE, we can
use that value to signal that no specific target type has been
configured for the serial device and as such the attribute should
not be formatted at all. All other values are now formatted.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel 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: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

The devicePostParse() callback is invoked for all devices so that
drivers have a chance to set their own specific values; however,
virDomainDefAddImplicitDevices() runs *after* the devicePostParse()
callbacks have been invoked and can add new devices, in which case
the driver wouldn't have a chance to customize them.

Work around the issue by invoking the devicePostParse() callback
after virDomainDefAddImplicitDevices(), only for the first serial
devices, which might have been added by it. The same was already
happening for the first video device for the very same reason.

This will become important later on, when we will change
virDomainDefAddConsoleCompat() not to set a targetType for
automatically added serial devices.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

Having a separate function for char device handling is better than
adding even more code to qemuDomainDeviceDefPostParse().
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Reviewed-by: NMarc Hartmayer <mhartmay@linux.vnet.ibm.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.

Detect the capability via the query-qmp-schema for blockdev-add
to find the 'password-secret' parameter that will allow the iSCSI
code to use the master secret object to encrypt the secret for an
and only need to provide the object id of the secret on the command
line thus obsfuscating the passphrase.

Rather than building the "file" string in qemuBuildSCSIHostdevDrvStr
build it in the called helper.

Since it's not longer used to shuttle the @secinfo, let's remove
the private hostdev completely.

Rather than placing/using privateData about secinfo in the hostdev,
let's use the virStorageSource private data instead.

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.

Utilize all the newly introduced function to create the evdev node
and label it on hotplug and destroy it on hotunplug.

This was forgotten in commits bc9ffafc and 67486bb2.

https://bugzilla.redhat.com/show_bug.cgi?id=1509866