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docs: domain: Be more upfront about 'sgio' not being actually supported

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The support for the 'sgio' attribute for SCSI-backed devices was dropped
as there wasn't really ever any upstream support for it.

The docs do state that support for this depends on the hypervisor
itself, but we can be more clear that there is no hypervisor which does
support it.

There is also a suggestion to use 'sgio' instead of 'rawio' as being
more "secure" but since it no longer works drop this suggestion.

Resolves: https://issues.redhat.com/browse/RHEL-65268
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2024-10-30 10:17:46 +01:00
parent d02140383d
commit eb4ed1fe15
1 changed files with 17 additions and 13 deletions
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30
docs/formatdomain.rst
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@ -2767,14 +2767,13 @@ paravirtualized driver is specified via the ``disk`` element.
per-process basis). This attribute is only valid when device is "lun". NB,
``rawio`` intends to confine the capability per-device, however, current
QEMU implementation gives the domain process broader capability than that
(per-process basis, affects all the domain disks). To confine the
capability as much as possible for QEMU driver as this stage, ``sgio`` is
recommended, it's more secure than ``rawio``. :since:`Since 0.9.10`
(per-process basis, affects all the domain disks). :since:`Since 0.9.10`
``sgio``
If supported by the hypervisor and OS, indicates whether unprivileged
SG_IO commands are filtered for the disk. Valid settings are "filtered" or
"unfiltered" where the default is "filtered". Only available when the
``device`` is 'lun'. :since:`Since 1.0.2`
``device`` is 'lun'. The attribute exists :since:`Since 1.0.2`, although
currently it's no longer supported by any hypervisor.
``snapshot``
Indicates the default behavior of the disk during disk snapshots:
``internal`` requires a file format such as qcow2 that can store both
@ -4346,7 +4345,7 @@ or:
...
<devices>
<hostdev mode='subsystem' type='scsi' sgio='filtered' rawio='yes'>
<hostdev mode='subsystem' type='scsi' rawio='yes'>
<source>
<adapter name='scsi_host0'/>
<address bus='0' target='0' unit='0'/>
@ -4436,14 +4435,19 @@ or:
``display`` attribute to be set to ``on``.
``scsi``
For SCSI devices, user is responsible to make sure the device is not used
by host. If supported by the hypervisor and OS, the optional ``sgio`` (
:since:`since 1.0.6` ) attribute indicates whether unprivileged SG_IO
commands are filtered for the disk. Valid settings are "filtered" or
"unfiltered", where the default is "filtered". The optional ``rawio`` (
:since:`since 1.2.9` ) attribute indicates whether the lun needs the rawio
capability. Valid settings are "yes" or "no". See the rawio description
within the `Hard drives, floppy disks, CDROMs`_ section. If a disk lun in the domain
already has the rawio capability, then this setting not required.
by host.
If supported by the hypervisor and OS, the optional ``sgio`` (
:since:`since 1.0.6`, but currently no longer supported by any hypervisor
driver ) attribute indicates whether unprivileged SG_IO commands are
filtered for the disk. Valid settings are "filtered" or
"unfiltered", where the default is "filtered".
The optional ``rawio`` (:since:`since 1.2.9` ) attribute indicates whether
the lun needs the rawio capability. Valid settings are "yes" or "no".
See the rawio description within the `Hard drives, floppy disks, CDROMs`_
section. If a disk lun in the domain already has the rawio capability,
then this setting not required.
``scsi_host``
:since:`since 2.5.0` For SCSI devices, user is responsible to make sure
the device is not used by host. This ``type`` passes all LUNs presented by