During qemu init stage, when there is pci BDF conflicts, qemu print
a warning but not showing which device the BDF is occupied by. E.x:
"PCI: slot 2 function 0 not available for virtio-scsi-pci, in use by virtio-scsi-pci"
To facilitate user knowing the offending device and fixing it, showing
the id info in the warning.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20220223094435.64495-1-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This patch provides the building blocks for creating an SR/IOV
PCIe Extended Capability header and register/unregister
SR/IOV Virtual Functions.
Signed-off-by: Knut Omang <knuto@ifi.uio.no>
Message-Id: <20220217174504.1051716-2-lukasz.maniak@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Move the pci_intx() definition to the PCI header file, so that it can
be called from other PCI files. It is used by the next patch.
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20211116170133.724751-3-fbarrat@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Unify format used by trace_pci_update_mappings_del(),
trace_pci_update_mappings_add(), trace_pci_cfg_write() and
trace_pci_cfg_read() to print the device name and bus number,
slot number and function number.
For instance:
pci_cfg_read virtio-net-pci 00:0 @0x20 -> 0xffffc00c
pci_cfg_write virtio-net-pci 00:0 @0x20 <- 0xfea0000c
pci_update_mappings_del d=0x555810b92330 01:00.0 4,0xffffc000+0x4000
pci_update_mappings_add d=0x555810b92330 01:00.0 4,0xfea00000+0x4000
becomes
pci_cfg_read virtio-net-pci 01:00.0 @0x20 -> 0xffffc00c
pci_cfg_write virtio-net-pci 01:00.0 @0x20 <- 0xfea0000c
pci_update_mappings_del virtio-net-pci 01:00.0 4,0xffffc000+0x4000
pci_update_mappings_add virtio-net-pci 01:00.0 4,0xfea00000+0x4000
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20211105192541.655831-1-lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Yanan Wang <wangyanan55@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This allows to power off pci devices. In "off" state the devices will
not be visible. No pci config space access, no pci bar access, no dma.
Default state is "on", so this patch (alone) should not change behavior.
Use case: Allows hotplug controllers implement slot power. Hotplug
controllers doing so should set the inital power state for devices in
the ->plug callback.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20211111130859.1171890-2-kraxel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
They're actually more commonly used than the helper without _under_bus, because
most callers do have the pci bus on hand. After exporting we can switch a lot
of the call sites to use these two helpers.
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20211028043129.38871-3-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
They're used in quite a few places of pci.[ch] and also in the rest of the code
base. Define them so that it doesn't need to be defined all over the places.
The pci_bus_fn is similar to pci_bus_dev_fn that only takes a PCIBus* and an
opaque. The pci_bus_ret_fn is similar to pci_bus_fn but it allows to return a
void* pointer.
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20211028043129.38871-2-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Rename the "allocate and return" qbus creation function to
qbus_new(), to bring it into line with our _init vs _new convention.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Corey Minyard <cminyard@mvista.com>
Message-id: 20210923121153.23754-6-peter.maydell@linaro.org
Rename qbus_create_inplace() to qbus_init(); this is more in line
with our usual naming convention for functions that in-place
initialize objects.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20210923121153.23754-5-peter.maydell@linaro.org
Rename the pci_root_bus_new_inplace() function to
pci_root_bus_init(); this brings the bus type in to line with a
"_init for in-place init, _new for allocate-and-return" convention.
To do this we need to rename the implementation-internal function
that was using the pci_root_bus_init() name to
pci_root_bus_internal_init().
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20210923121153.23754-4-peter.maydell@linaro.org
This helps to get the min and max bus number of a PCI bus hierarchy.
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <1625748919-52456-6-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Add a new bypass_iommu property for PCI host and use it to check
whether devices attached to the PCI root bus will bypass iommu.
In pci_device_iommu_address_space(), check the property and
avoid getting iommu address space for devices bypass iommu.
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <1625748919-52456-2-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Stop including exec/address-spaces.h in files that don't need it.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210416171314.2074665-5-thuth@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
If a device model
(a) doesn't set the value to a correct interrupt number and then
(b) triggers an interrupt for itself,
it's device model bug. Add assert on interrupt pin number to catch
this kind of bug more obviously.
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Message-Id: <9cf8ac3b17e162daac0971d7be32deb6a33ae6ec.1616532563.git.isaku.yamahata@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
In x86/ACPI world, linux distros are using predictable
network interface naming since systemd v197. Which on
QEMU based VMs results into path based naming scheme,
that names network interfaces based on PCI topology.
With itm on has to plug NIC in exactly the same bus/slot,
which was used when disk image was first provisioned/configured
or one risks to loose network configuration due to NIC being
renamed to actually used topology.
That also restricts freedom to reshape PCI configuration of
VM without need to reconfigure used guest image.
systemd also offers "onboard" naming scheme which is
preferred over PCI slot/topology one, provided that
firmware implements:
"
PCI Firmware Specification 3.1
4.6.7. DSM for Naming a PCI or PCI Express Device Under
Operating Systems
"
that allows to assign user defined index to PCI device,
which systemd will use to name NIC. For example, using
-device e1000,acpi-index=100
guest will rename NIC to 'eno100', where 'eno' is default
prefix for "onboard" naming scheme. This doesn't require
any advance configuration on guest side to com in effect
at 'onboard' scheme takes priority over path based naming.
Hope is that 'acpi-index' it will be easier to consume by
management layer, compared to forcing specific PCI topology
and/or having several disk image templates for different
topologies and will help to simplify process of spawning
VM from the same template without need to reconfigure
guest NIC.
This patch adds, 'acpi-index'* property and wires up
a 32bit register on top of pci hotplug register block
to pass index value to AML code at runtime.
Following patch will add corresponding _DSM code and
wire it up to PCI devices described in ACPI.
*) name comes from linux kernel terminology
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20210315180102.3008391-3-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
While pci_bus_realize() currently does not use the Error* argument,
it would be an error to leave pcie_bus_realize() setting bus->flags
if pci_bus_realize() had failed.
Fix by using a local Error* and return early (propagating the error)
if pci_bus_realize() failed.
Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210201153700.618946-1-philmd@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Commit a1190ab628 has added a "allow_unplug_during_migration = true" at
the end of the main "if" block, so it is not needed to set it anymore
in the previous checking.
Remove it, to have only sub-ifs that check for needed conditions and exit
if one fails.
Fixes: 4f5b6a05a4 ("pci: add option for net failover")
Fixes: a1190ab628 ("migration: allow unplug during migration for failover devices")
Cc: jfreimann@redhat.com
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20210212135250.2738750-2-lvivier@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jens Freimann <jfreimann@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
This property can be useful for distros to set up known-good ROM sizes for
migration purposes. The VM will fail to start if the ROM is too large,
and migration compatibility will not be broken if the ROM is too small.
Note that even though romsize is a uint32_t, it has to be between 1
(because empty ROM files are not accepted, and romsize must be greater
than the file) and 2^31 (because values above are not powers of two and
are rejected).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20201218182736.1634344-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210203131828.156467-3-pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
get_image_size() returns an int64_t, which pci_add_option_rom() assigns
to an "int" without any range checking. A 32-bit BAR could be up to
2 GiB in size, so reject anything above it. In order to accomodate
a rounded-up size of 2 GiB, change pci_patch_ids's size argument
to unsigned.
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210203131828.156467-2-pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
These cases require a bit more thought to review; in each case, the
code was appending to a list, but not with a FOOList **tail variable.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210113221013.390592-6-eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Flawed change to qmp_guest_network_get_interfaces() dropped]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Commit 8118f0950f "migration: Append JSON description of migration
stream" needs a JSON writer. The existing qobject_to_json() wasn't a
good fit, because it requires building a QObject to convert. Instead,
migration got its very own JSON writer, in commit 190c882ce2 "QJSON:
Add JSON writer". It tacitly limits numbers to int64_t, and strings
contents to characters that don't need escaping, unlike
qobject_to_json().
The previous commit factored the JSON writer out of qobject_to_json().
Replace migration's JSON writer by it.
Cc: Juan Quintela <quintela@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201211171152.146877-17-armbru@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Move the property types and property macros implemented in
qdev-properties-system.c to a new qdev-properties-system.h
header.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20201211220529.2290218-16-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Generalize the qdev_hotplug variable to the different phases of
machine initialization. We would like to allow different
monitor commands depending on the phase.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Prevent future developers working on root complexes, root ports, or
bridges that also wish to implement a BAR for those, from shooting
themselves in the foot. PCI type 1 headers only support 2 base address
registers. It is incorrect and difficult to figure out what is wrong
with the device when this mistake is made. With this, it is immediate
and obvious what has gone wrong.
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Message-Id: <20201015181411.89104-2-ben.widawsky@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Asserts are used for developer bugs. As registering a bar of the wrong
size is not something that should be possible for a user to achieve,
this is a developer bug.
While here, use the more obvious helper function.
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Message-Id: <20201015181411.89104-1-ben.widawsky@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
These assertions similar to those in the adjacent pci_bus_get_irq_level()
function ensure that irqnum lies within the valid PCI bus IRQ range.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-Id: <20201011082022.3016-1-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201024203900.3619498-3-f4bug@amsat.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Extract pci_bus_change_irq_level() from pci_change_irq_level() to
make it clearer it operates on the bus.
Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201024203900.3619498-2-f4bug@amsat.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
'occupied' is spelled like 'ocuppied' in the message.
Signed-off-by: Julia Suvorova <jusual@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20201006133958.600932-1-jusual@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Only qemu-system-FOO and qemu-storage-daemon provide QMP
monitors, therefore such declarations and definitions are
irrelevant for user-mode emulation.
Extracting the PCI commands to their own schema reduces the size of
the qapi-misc* headers generated, and pulls less QAPI-generated code
into user-mode.
Suggested-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200913195348.1064154-9-philmd@redhat.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
When debugging QEMU it is often useful to put a breakpoint on the
error_setg_internal method impl.
Unfortunately the object_property_add / object_class_property_add
methods call object_property_find / object_class_property_find methods
to check if a property exists already before adding the new property.
As a result there are a huge number of calls to error_setg_internal
on startup of most QEMU commands, making it very painful to set a
breakpoint on this method.
Most callers of object_find_property and object_class_find_property,
however, pass in a NULL for the Error parameter. This simplifies the
methods to remove the Error parameter entirely, and then adds some
new wrapper methods that are able to raise an Error when needed.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200914135617.1493072-1-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200610053247.1583243-18-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
I'm converting from qdev_create()/qdev_init_nofail() to
qdev_new()/qdev_realize_and_unref(); recent commit "qdev: New
qdev_new(), qdev_realize(), etc." explains why.
PCI devices use qdev_create() through pci_create() and
pci_create_multifunction().
Provide pci_new(), pci_new_multifunction(), and
pci_realize_and_unref() for converting PCI devices.
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200610053247.1583243-14-armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
I'm going to convert device realization to qdev_realize() with the
help of Coccinelle. Convert bus realization to qbus_realize() first,
to get it out of Coccinelle's way. Readability improves.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200610053247.1583243-7-armbru@redhat.com>
Sometimes it would be good to be able to read the pin number along
with the IRQ number allocated. Since we'll dump the IRQ number, no
reason to not dump the pin information. For example, the vfio-pci
device will overwrite the pin with the hardware pin number. It would
be nice to know the pin number of one assigned device from QMP/HMP.
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Alex Williamson <alex.williamson@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
CC: Julia Suvorova <jusual@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200317195908.283800-1-peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
QEMU currently aborts when being started with "-nic model=rocker" or with
"-net nic,model=rocker". This happens because the "rocker" device is not
a normal NIC but a switch, which has different properties. Thus we should
only consider real NIC devices for "-nic" and "-net". These devices can
be identified by the "netdev" property, so check for this property before
adding the device to the list.
Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Fixes: 52310c3fa7 ("net: allow using any PCI NICs in -net or -nic")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20200527153152.9211-1-thuth@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
While accessing PCI configuration bytes, assert that
'address + len' is within PCI configuration space.
Generally it is within bounds. This is more of a defensive
assert, in case a buggy device was to send 'address' which
may go out of bounds.
Suggested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20200604113525.58898-1-ppandit@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Devices may have component devices and buses.
Device realization may fail. Realization is recursive: a device's
realize() method realizes its components, and device_set_realized()
realizes its buses (which should in turn realize the devices on that
bus, except bus_set_realized() doesn't implement that, yet).
When realization of a component or bus fails, we need to roll back:
unrealize everything we realized so far. If any of these unrealizes
failed, the device would be left in an inconsistent state. Must not
happen.
device_set_realized() lets it happen: it ignores errors in the roll
back code starting at label child_realize_fail.
Since realization is recursive, unrealization must be recursive, too.
But how could a partly failed unrealize be rolled back? We'd have to
re-realize, which can fail. This design is fundamentally broken.
device_set_realized() does not roll back at all. Instead, it keeps
unrealizing, ignoring further errors.
It can screw up even for a device with no buses: if the lone
dc->unrealize() fails, it still unregisters vmstate, and calls
listeners' unrealize() callback.
bus_set_realized() does not roll back either. Instead, it stops
unrealizing.
Fortunately, no unrealize method can fail, as we'll see below.
To fix the design error, drop parameter @errp from all the unrealize
methods.
Any unrealize method that uses @errp now needs an update. This leads
us to unrealize() methods that can fail. Merely passing it to another
unrealize method cannot cause failure, though. Here are the ones that
do other things with @errp:
* virtio_serial_device_unrealize()
Fails when qbus_set_hotplug_handler() fails, but still does all the
other work. On failure, the device would stay realized with its
resources completely gone. Oops. Can't happen, because
qbus_set_hotplug_handler() can't actually fail here. Pass
&error_abort to qbus_set_hotplug_handler() instead.
* hw/ppc/spapr_drc.c's unrealize()
Fails when object_property_del() fails, but all the other work is
already done. On failure, the device would stay realized with its
vmstate registration gone. Oops. Can't happen, because
object_property_del() can't actually fail here. Pass &error_abort
to object_property_del() instead.
* spapr_phb_unrealize()
Fails and bails out when remove_drcs() fails, but other work is
already done. On failure, the device would stay realized with some
of its resources gone. Oops. remove_drcs() fails only when
chassis_from_bus()'s object_property_get_uint() fails, and it can't
here. Pass &error_abort to remove_drcs() instead.
Therefore, no unrealize method can fail before this patch.
device_set_realized()'s recursive unrealization via bus uses
object_property_set_bool(). Can't drop @errp there, so pass
&error_abort.
We similarly unrealize with object_property_set_bool() elsewhere,
always ignoring errors. Pass &error_abort instead.
Several unrealize methods no longer handle errors from other unrealize
methods: virtio_9p_device_unrealize(),
virtio_input_device_unrealize(), scsi_qdev_unrealize(), ...
Much of the deleted error handling looks wrong anyway.
One unrealize methods no longer ignore such errors:
usb_ehci_pci_exit().
Several realize methods no longer ignore errors when rolling back:
v9fs_device_realize_common(), pci_qdev_unrealize(),
spapr_phb_realize(), usb_qdev_realize(), vfio_ccw_realize(),
virtio_device_realize().
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-17-armbru@redhat.com>
The pci_do_device_reset() function (called from pci_device_reset)
clears the PCI_INTERRUPT_LINE config reg of devices on the bus but did
this without taking wmask into account. We'll have a device model now
that needs to set a constant value for this reg and this patch allows
to do that without additional workaround in device emulation to
reverse the effect of this PCI bus reset function.
Suggested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-id: 20200313082444.2439-4-mark.cave-ayland@ilande.co.uk
Signed-off-by: John Snow <jsnow@redhat.com>
Define the new macro VMSTATE_INSTANCE_ID_ANY for callers who wants to
auto-generate the vmstate instance ID. Previously it was hard coded
as -1 instead of this macro. It helps to change this default value in
the follow up patches. No functional change.
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Now that the old pc-0.x machine types have been removed, this config
knob is not required anymore.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20191209125248.5849-4-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
PCIe requester IDs are used by modern IOMMUs to differentiate devices
in order to provide a unique IOVA address space per device. These
requester IDs are composed of the bus/device/function (BDF) of the
requesting device. Conventional PCI pre-dates this concept and is
simply a shared parallel bus where transactions are claimed by
decoding target ranges rather than the packetized, point-to-point
mechanisms of PCI-express. In order to interface conventional PCI
to PCIe, the PCIe-to-PCI bridge creates and accepts packetized
transactions on behalf of all downstream devices, using one of two
potential forms of a requester ID relating to the bridge itself or its
subordinate bus. All downstream devices are therefore aliased by the
bridge's requester ID and it's not possible for the IOMMU to create
unique IOVA spaces for devices downstream of such buses.
At least that's how it works on bare metal. Until now point we've
ignored this nuance of vIOMMU support in QEMU, creating a unique
AddressSpace per device regardless of the virtual bus topology.
Aside from simply being true to bare metal behavior, there are aspects
of a shared address space that we can use to our advantage when
designing a VM. For instance, a PCI device assignment scenario where
we have the following IOMMU group on the host system:
$ ls /sys/kernel/iommu_groups/1/devices/
0000:00:01.0 0000:01:00.0 0000:01:00.1
An IOMMU group is considered the smallest set of devices which are
fully DMA isolated from other devices by the IOMMU. In this case the
root port at 00:01.0 does not guarantee that it prevents peer to peer
traffic between the endpoints on bus 01: and the devices are therefore
grouped together. VFIO considers an IOMMU group to be the smallest
unit of device ownership and allows only a single shared IOVA space
per group due to the limitations of the isolation.
Therefore, if we attempt to create the following VM, we get an error:
qemu-system-x86_64 -machine q35... \
-device intel-iommu,intremap=on \
-device pcie-root-port,addr=1e.0,id=pcie.1 \
-device vfio-pci,host=1:00.0,bus=pcie.1,addr=0.0,multifunction=on \
-device vfio-pci,host=1:00.1,bus=pcie.1,addr=0.1
qemu-system-x86_64: -device vfio-pci,host=1:00.1,bus=pcie.1,addr=0.1: vfio \
0000:01:00.1: group 1 used in multiple address spaces
VFIO only allows a single IOVA space (AddressSpace) for both devices,
but we've placed them into a topology where the vIOMMU expects a
separate AddressSpace for each device. On bare metal we know that
a conventional PCI bus would provide the sort of aliasing we need
here, forcing the IOMMU to consider these devices to be part of a
single shared IOVA space. The support provided here does the same
for QEMU, such that we can create a conventional PCI topology to
expose equivalent AddressSpace sharing requirements to the VM:
qemu-system-x86_64 -machine q35... \
-device intel-iommu,intremap=on \
-device pcie-pci-bridge,addr=1e.0,id=pci.1 \
-device vfio-pci,host=1:00.0,bus=pci.1,addr=1.0,multifunction=on \
-device vfio-pci,host=1:00.1,bus=pci.1,addr=1.1
There are pros and cons to this configuration; it's not necessarily
recommended, it's simply a tool we can use to create configurations
which may provide additional functionality in spite of host hardware
limitations or as a benefit to the guest configuration or resource
usage. An incomplete list of pros and cons:
Cons:
a) Extended PCI configuration space is unavailable to devices
downstream of a conventional PCI bus. The degree to which this
is a drawback depends on the device and guest drivers.
b) Applying this topology to devices which are already isolated by
the host IOMMU (singleton IOMMU groups) will result in devices
which appear to be non-isolated to the VM (non-singleton groups).
This can limit configurations within the guest, such as userspace
drivers or nested device assignment.
Pros:
a) QEMU better emulates bare metal.
b) Configurations as above are now possible.
c) Host IOMMU resources and VM locked memory requirements are reduced
in vIOMMU configurations due to shared IOMMU domains on the host
and avoidance of duplicate locked memory accounting.
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Message-Id: <157187083548.5439.14747141504058604843.stgit@gimli.home>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
In "b06424de62 migration: Disable hotplug/unplug during migration" we
added a check to disable unplug for all devices until we have figured
out what works. For failover primary devices qdev_unplug() is called
from the migration handler, i.e. during migration.
This patch adds a flag to DeviceState which is set to false for all
devices and makes an exception for PCI devices that are also
primary devices in a failover pair.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
Message-Id: <20191029114905.6856-8-jfreimann@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This patch adds a failover_pair_id property to PCIDev which is
used to link the primary device in a failover pair (the PCI dev) to
a standby (a virtio-net-pci) device.
It only supports ethernet devices. Also currently it only supports
PCIe devices. The requirement for PCIe is because it doesn't support
other hotplug controllers at the moment. The failover functionality can
be added to other hotplug controllers like ACPI, SHCP,... later on.
Signed-off-by: Jens Freimann <jfreimann@redhat.com>
Message-Id: <20191029114905.6856-3-jfreimann@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
