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| author | Stefan Hajnoczi <stefanha@redhat.com> | 2023-12-20 08:47:54 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2023-12-21 22:49:28 +0100 |
| commit | cf03a152c5d749fd0083bfe540df9524f1d2ff1d (patch) | |
| tree | 231d2e5f03266974195ac5d39571baeba89382a7 /include/hw/qdev-properties-system.h | |
| parent | 350147a871a545ab56b4a1062c8485635d9ffc24 (diff) | |
| download | focaccia-qemu-cf03a152c5d749fd0083bfe540df9524f1d2ff1d.tar.gz focaccia-qemu-cf03a152c5d749fd0083bfe540df9524f1d2ff1d.zip | |
qdev: add IOThreadVirtQueueMappingList property type
virtio-blk and virtio-scsi devices will need a way to specify the
mapping between IOThreads and virtqueues. At the moment all virtqueues
are assigned to a single IOThread or the main loop. This single thread
can be a CPU bottleneck, so it is necessary to allow finer-grained
assignment to spread the load.
Introduce DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST() so devices can take a
parameter that maps virtqueues to IOThreads. The command-line syntax for
this new property is as follows:
--device '{"driver":"foo","iothread-vq-mapping":[{"iothread":"iothread0","vqs":[0,1,2]},...]}'
IOThreads are specified by name and virtqueues are specified by 0-based
index.
It will be common to simply assign virtqueues round-robin across a set
of IOThreads. A convenient syntax that does not require specifying
individual virtqueue indices is available:
--device '{"driver":"foo","iothread-vq-mapping":[{"iothread":"iothread0"},{"iothread":"iothread1"},...]}'
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20231220134755.814917-4-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'include/hw/qdev-properties-system.h')
| -rw-r--r-- | include/hw/qdev-properties-system.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/hw/qdev-properties-system.h b/include/hw/qdev-properties-system.h index 91f7a2452d..06c359c190 100644 --- a/include/hw/qdev-properties-system.h +++ b/include/hw/qdev-properties-system.h @@ -24,6 +24,7 @@ extern const PropertyInfo qdev_prop_off_auto_pcibar; extern const PropertyInfo qdev_prop_pcie_link_speed; extern const PropertyInfo qdev_prop_pcie_link_width; extern const PropertyInfo qdev_prop_cpus390entitlement; +extern const PropertyInfo qdev_prop_iothread_vq_mapping_list; #define DEFINE_PROP_PCI_DEVFN(_n, _s, _f, _d) \ DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_pci_devfn, int32_t) @@ -82,4 +83,8 @@ extern const PropertyInfo qdev_prop_cpus390entitlement; DEFINE_PROP_SIGNED(_n, _s, _f, _d, qdev_prop_cpus390entitlement, \ CpuS390Entitlement) +#define DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST(_name, _state, _field) \ + DEFINE_PROP(_name, _state, _field, qdev_prop_iothread_vq_mapping_list, \ + IOThreadVirtQueueMappingList *) + #endif |