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-device does not work as -drive do
Copy/paste of https://stackoverflow.com/questions/52929723/qemu-eject-complains-device-is-not-found-while-it-is-there , since I found this bug trying to find an answer to an own question on Stack Overflow.
Below, what was my question the answer I wrote, all exposes the bug.
====================================================================
I need to eject a floppy from QEmu 3.0 monitor, but the command surprisingly fails complaining the device is not found, while it is really there.
Listing of devices:
(qemu) info block
fda: dos-6-22/Dos622-1.img (raw)
Attached to: /machine/unattached/device[11]
Removable device: not locked, tray closed
Cache mode: writeback
hda: hda.img (raw)
Attached to: /machine/peripheral-anon/device[1]
Cache mode: writeback
Eject command result:
(qemu) eject fda
Device 'fda' not found
This is so although this documentation says this is how I have to do: https://www.linux-kvm.org/page/Change_cdrom (just that I want to eject the floppy instead of the CD‑ROM).
The `change` command complains the same:
(qemu) change fda dos-6-22/Dos622-2.img raw
Device 'fda' not found
Is this a bug or me doing something wrong?
I tried using different node names, with always the same result.
====================================================================
I’m posting as an answer, but I’m not strictly sure. I can just say, if I understand correctly, this is a bug.
The answer comes in two parts.
First part, is a stripped down failing invocation:
qemu-system-i386 \
-monitor stdio \
-machine type=isapc,vmport=off \
-blockdev driver=file,node-name=fda-img,filename=fda.img \
-blockdev driver=raw,node-name=fda,file=fda-img \
-global isa-fdc.driveA=fda
(qemu) info block
ide1-cd0: [not inserted]
Attached to: /machine/unattached/device[19]
Removable device: not locked, tray closed
sd0: [not inserted]
Removable device: not locked, tray closed
fda: fda.img (raw)
Attached to: /machine/unattached/device[13]
Removable device: not locked, tray closed
Cache mode: writeback
(qemu) eject fda
Device 'fda' not found
Second part, is the same without the last argument `-global isa-fdc.driveA=fda`:
qemu-system-i386 \
-monitor stdio \
-machine type=isapc,vmport=off \
-blockdev driver=file,node-name=fda-img,filename=fda.img \
-blockdev driver=raw,node-name=fda,file=fda-img
(qemu) info block
ide1-cd0: [not inserted]
Attached to: /machine/unattached/device[19]
Removable device: not locked, tray closed
floppy0: [not inserted]
Attached to: /machine/unattached/device[13]
Removable device: not locked, tray closed
sd0: [not inserted]
Removable device: not locked, tray closed
(qemu) eject floppy0
There is more error when `-global isa-fdc.driveA=fda` is removed. However, the documentation says:
> -global driver=driver,property=property,value=value
> Set default value of driver’s property prop to value, e.g.:
> qemu-system-i386 -global ide-hd.physical_block_size=4096 disk-image.img
> In particular, you can **use this to set driver properties for devices which are created automatically by the machine model**. To create a device which is not created automatically and set properties on it, use -device.
> -global driver.prop=value is shorthand for -global driver=driver,property=prop,value=value. The longhand syntax works even when driver contains a dot.
What I put a stress on in the quote, suggest I’m not misusing `-global` and that’s most probably a bug.
**Update for more details:**
It seems using `-drive` instead of `-device` and `driveA` assignment, the result is not the same, although RedHat documentation recommands using `-device` instead of `-drive` and QEmu 3.0 documentation says `-drive` is essentially a shortcut for `-device` (“essentially”, not telling about the difference).
Below, two cases, with an except of `info block` and an excerpt of `info qtree`.
With this one, `eject floppy0` works:
qemu-system-i386 \
-monitor stdio \
-machine type=isapc,vmport=off \
-drive format=raw,if=floppy,media=disk,file=fda.img \
-device isa-vga,vgamem_mb=1 \
-serial msmouse
[…]
floppy0 (#block156): fda.img (raw)
Attached to: /machine/unattached/device[12]
Removable device: not locked, tray closed
Cache mode: writeback
[…]
dev: isa-fdc, id ""
iobase = 1008 (0x3f0)
irq = 6 (0x6)
dma = 2 (0x2)
driveA = ""
driveB = ""
check_media_rate = true
fdtypeA = "auto"
fdtypeB = "auto"
fallback = "288"
isa irq 6
bus: floppy-bus.0
type floppy-bus
dev: floppy, id ""
unit = 0 (0x0)
drive = "floppy0"
logical_block_size = 512 (0x200)
physical_block_size = 512 (0x200)
min_io_size = 0 (0x0)
opt_io_size = 0 (0x0)
discard_granularity = 4294967295 (0xffffffff)
write-cache = "auto"
share-rw = false
drive-type = "144"
With this one, `eject fda` does not work:
qemu-system-i386 \
-monitor stdio \
-machine type=isapc,vmport=off \
-blockdev driver=file,node-name=fda-img,filename=fda.img \
-blockdev driver=raw,node-name=fda,file=fda-img \
-global isa-fdc.driveA=fda \
-device isa-vga,vgamem_mb=1 \
-serial msmouse
[…]
fda: fda.img (raw)
Attached to: /machine/unattached/device[12]
Removable device: not locked, tray closed
Cache mode: writeback
[…]
dev: isa-fdc, id ""
iobase = 1008 (0x3f0)
irq = 6 (0x6)
dma = 2 (0x2)
driveA = ""
driveB = ""
check_media_rate = true
fdtypeA = "auto"
fdtypeB = "auto"
fallback = "288"
isa irq 6
bus: floppy-bus.0
type floppy-bus
dev: floppy, id ""
unit = 0 (0x0)
drive = "fda"
logical_block_size = 512 (0x200)
physical_block_size = 512 (0x200)
min_io_size = 0 (0x0)
opt_io_size = 0 (0x0)
discard_granularity = 4294967295 (0xffffffff)
write-cache = "auto"
share-rw = false
drive-type = "144"
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