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2012-08-20virtio-scsi: add backwards-compatibility properties for 1.1 and earlier machinesPaolo Bonzini1-7/+0
Hotplug and parameter change are new in 1.2, disable them via compat properties for pc-1.1 and earlier. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-08-09virtio-scsi: do not compare 32-bit QEMU tags against 64-bit virtio-scsi tagsPaolo Bonzini1-2/+8
This patch fixes a problem in handling task management functions in virtio-scsi. The cause of the problem is a mismatch between the size of the tag in QEMU (32-bit) and virtio-scsi (64-bit). Changing the QEMU size is hard because the migration format uses 32 bits to store the tag; so just don't use the QEMU tag (virtio-scsi only uses the tag for task management functions anyway) and look up the full 64-bit tag in the hba_private field. The reproducer is a bit obscure. If you cause an I/O timeout (for example with rerror=stop and doing 'cont' on the monitor continuously without fixing the error), sooner or later the guest will try to abort the command and reissue it. At this point, QEMU will report _two_ errors instead of one when you hit 'c', because the first error has not been canceled correctly. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-27virtio-scsi: report parameter change eventsPaolo Bonzini1-0/+16
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-27virtio-scsi: do not report dropped events after resetPaolo Bonzini1-0/+1
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-27virtio-scsi: Report missed eventsPaolo Bonzini1-18/+36
When an event is reported but no buffers are present in the event vq, we can set a flag and report a dummy event as soon as one is added. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-27virtio-scsi: Implement hotplug support for virtio-scsiCong Meng1-2/+70
Implement the hotplug() and hot_unplug() interfaces in virtio-scsi, by signal the virtio_scsi.ko in guest kernel via event virtual queue. The counterpart patch of virtio_scsi.ko will be sent soon in another thread. Signed-off-by: Sen Wang <senwang@linux.vnet.ibm.com> Signed-off-by: Cong Meng <mc@linux.vnet.ibm.com> [ Add memset, fix LUN field, placate checkpatch - Paolo ] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-07-02virtio-scsi: do not crash on adding buffers to the event queuePaolo Bonzini1-1/+5
The event queue is not supported yet and the handler does not have to do much anyway when buffers are added. However, the handler is called unconditionally by the virtio layer, and this results in a crash as soon as buffers are added to the event queue because we pass NULL. Reported-by: Bryan Venteicher <bryanv@daemoninthecloset.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-06-18qbus: Make child devices linksAnthony Liguori1-3/+3
Make qbus children show up as link<> properties. There is no stable addressing for qbus children so we use an unstable naming convention. This is okay in QOM though because the composition name is expected to be what's stable. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2012-05-21virtio: check virtio_load return codeOrit Wassermann1-1/+6
Otherwise we crash on error. Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com> Signed-off-by: Orit Wassermann <owasserm@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-04-19virtio-scsi: add multiqueue capabilityPaolo Bonzini1-10/+15
Adding multiqueue is as simple as creating more than one virtqueues, and saving the queue number for each request. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-04-19virtio-scsi: prepare migration format for multiqueuePaolo Bonzini1-0/+5
In order to restore requests correctly from a multitude of virtqueues, we need to store the id of the request queue that each request came from. Do this even for single-queue, by storing a hard-coded zero, to simplify future implementation of multiqueue. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-03-19virtio-scsi: call unregister_savevm properlyPaolo Bonzini1-0/+2
This fixes a use-after-free when migrating after hot-unplug. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-24virtio-scsi: add migration supportPaolo Bonzini1-1/+49
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-24virtio-scsi: process control queue requestsPaolo Bonzini1-8/+126
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-22virtio-scsi: add basic SCSI bus operationPaolo Bonzini1-13/+98
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-22virtio-scsi: Add basic request processing infrastructureStefan Hajnoczi1-2/+140
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-02-22virtio-scsi: Add virtio-scsi stub deviceStefan Hajnoczi1-0/+228
Add a useless virtio SCSI HBA device: qemu -device virtio-scsi-pci Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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