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virtio-scsi: Send "REPORTED LUNS CHANGED" sense data upon disk hotplug events

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Section 5.6.6.3 of VirtIO specification states, "Events will also
be reported via sense codes..." However, no sense data is sent when
VIRTIO_SCSI_EVT_RESET_RESCAN or VIRTIO_SCSI_EVT_RESET_REMOVED events
are reported (when disk hotplug/hotunplug events occur). SCSI layer
on Solaris depends on this sense data, and hence does not handle disk
hotplug/hotunplug events.

When the disk inventory changes, use the bus unit attention mechanism
to return a CHECK_CONDITION status with sense data of 0x06/0x3F/0x0E
(sense code REPORTED_LUNS_CHANGED).  The first device on the bus to
execute a command successfully will report and consume the unit
attention status.

Signed-off-by: Venu Busireddy <venu.busireddy@oracle.com>
Message-Id: <20221006194946.24134-1-venu.busireddy@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Venu Busireddy 2022-10-06 14:49:46 -05:00 committed by Paolo Bonzini
parent 2ba341b369
commit 8cc5583abe
3 changed files with 21 additions and 0 deletions
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18
hw/scsi/scsi-bus.c
View File

@ -1616,6 +1616,24 @@ static int scsi_ua_precedence(SCSISense sense)
return (sense.asc << 8) | sense.ascq;
}
void scsi_bus_set_ua(SCSIBus *bus, SCSISense sense)
{
int prec1, prec2;
if (sense.key != UNIT_ATTENTION) {
return;
}
/*
* Override a pre-existing unit attention condition, except for a more
* important reset condition.
*/
prec1 = scsi_ua_precedence(bus->unit_attention);
prec2 = scsi_ua_precedence(sense);
if (prec2 < prec1) {
bus->unit_attention = sense;
}
}
void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense)
{
int prec1, prec2;

2
hw/scsi/virtio-scsi.c
View File

@ -956,6 +956,7 @@ static void virtio_scsi_hotplug(HotplugHandler *hotplug_dev, DeviceState *dev,
virtio_scsi_push_event(s, sd,
VIRTIO_SCSI_T_TRANSPORT_RESET,
VIRTIO_SCSI_EVT_RESET_RESCAN);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
virtio_scsi_release(s);
}
}
@ -973,6 +974,7 @@ static void virtio_scsi_hotunplug(HotplugHandler *hotplug_dev, DeviceState *dev,
virtio_scsi_push_event(s, sd,
VIRTIO_SCSI_T_TRANSPORT_RESET,
VIRTIO_SCSI_EVT_RESET_REMOVED);
scsi_bus_set_ua(&s->bus, SENSE_CODE(REPORTED_LUNS_CHANGED));
virtio_scsi_release(s);
}

1
include/hw/scsi/scsi.h
View File

@ -186,6 +186,7 @@ SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk,
BlockdevOnError rerror,
BlockdevOnError werror,
const char *serial, Error **errp);
void scsi_bus_set_ua(SCSIBus *bus, SCSISense sense);
void scsi_bus_legacy_handle_cmdline(SCSIBus *bus);
void scsi_legacy_handle_cmdline(void);