x86: 0.907
device: 0.855
user-level: 0.841
semantic: 0.828
debug: 0.809
files: 0.728
graphic: 0.727
performance: 0.699
PID: 0.660
mistranslation: 0.637
ppc: 0.614
assembly: 0.606
architecture: 0.585
socket: 0.555
peripherals: 0.532
permissions: 0.522
register: 0.497
kernel: 0.489
boot: 0.482
hypervisor: 0.477
i386: 0.472
arm: 0.438
virtual: 0.419
network: 0.419
risc-v: 0.415
vnc: 0.399
VMM: 0.207
TCG: 0.149
KVM: 0.102
--------------------
x86: 0.936
device: 0.493
virtual: 0.194
TCG: 0.104
debug: 0.099
files: 0.092
hypervisor: 0.047
user-level: 0.035
PID: 0.033
register: 0.020
peripherals: 0.013
architecture: 0.013
semantic: 0.012
boot: 0.007
socket: 0.006
kernel: 0.005
VMM: 0.005
assembly: 0.005
performance: 0.005
ppc: 0.004
network: 0.004
vnc: 0.003
risc-v: 0.003
permissions: 0.002
graphic: 0.002
KVM: 0.001
mistranslation: 0.001
i386: 0.001
arm: 0.001

-device ide-hd will assign bus with with no free units

Originally filed here: https://bugzilla.redhat.com/show_bug.cgi?id=1000118

./x86_64-softmmu/qemu-system-x86_64 -device ahci -drive id=aa,file=/tmp/foo,if=none -drive id=bb,file=/tmp/foo,if=none -device ide-hd,drive=aa -device ide-hd,drive=bb
qemu-system-x86_64: -device ide-hd,drive=bb: Can't create IDE unit 1, bus supports only 1 units
qemu-system-x86_64: -device ide-hd,drive=bb: Device initialization failed.
qemu-system-x86_64: -device ide-hd,drive=bb: Device 'ide-hd' could not be initialized

If a bus isn't specified for -device ide-hd, it just uses the first bus it finds, not taking into account if that bus was already assigned for another device. So users are forced to do -device ide-hd,bus=ide.0 -device ide-hd,bus=ide.1, etc. 

This isn't specific to -device ahci, but it's worse there since there isn't any -drive if=IDE or -hda convenience option, which both seem to get the logic correct.

I know -device is the 'build it yourself' approach so I understand if this is WONTFIX.

Is somebody still planning to fix this, or should this be closed as WONTFIX?

I'll re-investigate. I definitely fixed some of this (there is if=IDE for AHCI now), but I recall Markus mentioning recently that there are a lot of weird things quite broken with AHCI and bus assignment.

I'm working on several other IDE fixes for the next release, so we can add this one to the pile. I will leave it as "incomplete" for now since I need to re-assess.

[Expired for QEMU because there has been no activity for 60 days.]