diff options
| author | Daniel Henrique Barboza <danielhb413@gmail.com> | 2018-07-11 17:58:13 -0300 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2018-07-12 18:24:08 +0200 |
| commit | 740842c9656cd5dbc9ccf2ea0c3a74f0ba35144a (patch) | |
| tree | 287034eb3b138ac6a726ff2ae9d94332d5c43c0e /docs/specs | |
| parent | 2d4cb49ddaa219ed3f5a985ecf8b188aeb2b3d6b (diff) | |
| download | focaccia-qemu-740842c9656cd5dbc9ccf2ea0c3a74f0ba35144a.tar.gz focaccia-qemu-740842c9656cd5dbc9ccf2ea0c3a74f0ba35144a.zip | |
scsi-disk: Block Device Characteristics emulation fix
The current BDC VPD page (page 0xb1) is too short. This can be
seen running sg_utils:
$ sg_vpd --page=bdc /dev/sda
Block device characteristics VPD page (SBC):
Block device characteristics VPD page length too short=8
By the SCSI spec, the expected size of the SBC page is 0x40.
There is no telling how the guest will behave with a shorter
message - it can ignore it, or worse, make (wrong)
assumptions.
This patch fixes the emulation by setting the size to 0x40.
This is the output of the previous sg_vpd command after
applying it:
$ sg_vpd --page=bdc /dev/sda -v
inquiry cdb: 12 01 b1 00 fc 00
Block device characteristics VPD page (SBC):
[PQual=0 Peripheral device type: disk]
Medium rotation rate is not reported
Product type: Not specified
WABEREQ=0
WACEREQ=0
Nominal form factor not reported
FUAB=0
VBULS=0
To improve readability, this patch also adds the VBULS value
explictly and add comments on the existing fields we're
setting.
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'docs/specs')
0 files changed, 0 insertions, 0 deletions