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numam-spdk/doc/virtio.md

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doc/virtio: minor updates Reflect three changes: * Virtio now works with Linux and QEMU vhost targets * The Virtio library was separated from bdev modules * Virtio Blk bdev module has been added Change-Id: I7d3075ca863a1142b3ddcc4d18e982f3b7c72202 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/405288 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-03-26 06:10:07 +00:00
# Virtio driver {#virtio}
bdev_virtio: added doc page Change-Id: Ia88ae52117068ac395dad9ad3d7ac818e41077fb Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/380956 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
2017-10-02 17:31:06 +00:00
# Introduction {#virtio_intro}
doc/virtio: minor updates Reflect three changes: * Virtio now works with Linux and QEMU vhost targets * The Virtio library was separated from bdev modules * Virtio Blk bdev module has been added Change-Id: I7d3075ca863a1142b3ddcc4d18e982f3b7c72202 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/405288 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-03-26 06:10:07 +00:00
SPDK Virtio driver is a C library that allows communicating with Virtio devices.
It allows any SPDK application to become an initiator for (SPDK) vhost targets.
bdev_virtio: added doc page Change-Id: Ia88ae52117068ac395dad9ad3d7ac818e41077fb Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/380956 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
2017-10-02 17:31:06 +00:00
doc/virtio: minor updates Reflect three changes: * Virtio now works with Linux and QEMU vhost targets * The Virtio library was separated from bdev modules * Virtio Blk bdev module has been added Change-Id: I7d3075ca863a1142b3ddcc4d18e982f3b7c72202 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/405288 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-03-26 06:10:07 +00:00
The driver supports two different usage models:
bdev_virtio: added doc page Change-Id: Ia88ae52117068ac395dad9ad3d7ac818e41077fb Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/380956 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
2017-10-02 17:31:06 +00:00
* PCI - This is the standard mode of operation when used in a guest virtual
doc/virtio: minor updates Reflect three changes: * Virtio now works with Linux and QEMU vhost targets * The Virtio library was separated from bdev modules * Virtio Blk bdev module has been added Change-Id: I7d3075ca863a1142b3ddcc4d18e982f3b7c72202 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/405288 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-03-26 06:10:07 +00:00
machine, where QEMU has presented the virtio controller as a virtual PCI device.
* vhost-user - Can be used to connect to a vhost socket directly on the same host.
bdev_virtio: added doc page Change-Id: Ia88ae52117068ac395dad9ad3d7ac818e41077fb Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/380956 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
2017-10-02 17:31:06 +00:00
doc/virtio: minor doc updates Reworded some sentences, updated current limitation list, and dropped the outdated `Multiqueue` section. Change-Id: Id57777430f00b80c68cadf4c600e4ec89fa3c4e0 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/397082 Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-01-30 12:53:45 +00:00
The driver, just like the SPDK @ref vhost, is using pollers instead of standard
interrupts to check for an I/O response. If used inside a VM, it bypasses interrupt
and context switching overhead of QEMU and guest kernel, significantly boosting
the overall I/O performance.
bdev_virtio: added doc page Change-Id: Ia88ae52117068ac395dad9ad3d7ac818e41077fb Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/380956 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Paul Luse <paul.e.luse@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
2017-10-02 17:31:06 +00:00
doc/virtio: minor updates Reflect three changes: * Virtio now works with Linux and QEMU vhost targets * The Virtio library was separated from bdev modules * Virtio Blk bdev module has been added Change-Id: I7d3075ca863a1142b3ddcc4d18e982f3b7c72202 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/405288 Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-03-26 06:10:07 +00:00
This Virtio library is currently used to implement two bdev modules:
doc/virtio: add Virtio Block doc I decided to use 'Virtio Block' as the title. Virtio spec uses the same name alongside SCSI. ``` 5 Device Types [...] 5.2 Block Device 5.6 SCSI Host Device ``` Also added a CHANGELOG note. Change-Id: Ie2eabd053213da776c78a8d938a621b42e6d5558 Signed-off-by: Dariusz Stojaczyk <dariuszx.stojaczyk@intel.com> Reviewed-on: https://review.gerrithub.io/408829 Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com> Tested-by: SPDK Automated Test System <sys_sgsw@intel.com> Reviewed-by: John Kariuki <John.K.Kariuki@intel.com> Reviewed-by: Pawel Wodkowski <pawelx.wodkowski@intel.com> Reviewed-by: Maciej Szwed <maciej.szwed@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-04-24 10:17:56 +00:00
@ref bdev_config_virtio_scsi and @ref bdev_config_virtio_blk.
These modules will export generic SPDK block devices usable by any SPDK application.
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