On 7 August 2010 01:55, adq <a...@lidskialf.net> wrote:
> Hi, I've been tracking down why scsi generic devices (using SG_IO)
> don't work any more. After adding debug, I can see that it actually
> submits the scsi CDB in hw/scsi-generic.c/execute_command(), but that
> the hw/scsi-generic.c/scsi_read_complete() callback is never called.
>
> This is because these are done with ioctls, and the posix async ioctl
> code is, I think, broken right now. Some more debugging, led me to
> posix-aio-compat.c/posix_aio_process_queue():
>
> if (acb->async_context_id != async_context_id) {
>
> The async_context_ids don't match, so the request is never handled.
> This is because the acb->async_context_id field is not initialised in
> posix-aio-compat.c/paio_ioctl() (compare with
> posix-aio-compat.c/paio_submit()). The attached patch adds the missing
> line in.
>
> This seems to fix the problem. Of course, /now/ I'm getting other
> weird problems (as I'm trying to see if I can get slysoft anydvd
> working in a KVM winXP vm), but they need further investigation and
> likely other fixes.
>
> Please forgive me if I'm mistaken in this, I've only just started
> looking at the qemu code.
Hi, after further investigation, I can generate the "weird problem"
just from vanilla winxp. I'm using an lsi53c895a virtual SCSI device
BTW.
You can generate it by setting up a scsi generic cdrom, right clicking
on the cd/dvd device in winxp, click properties, hardware, select the
device from the list, and then choose Properties. Qemu will crash
instantly with the following debug from the emulated LSI code:
[snip]
lsi_scsi: Compare phase 1 == 7
lsi_scsi: Control condition failed
lsi_scsi: SCRIPTS dsp=f2022658 opcode 80880000 arg 00000414
lsi_scsi: Jump to 0xf2022a74
lsi_scsi: SCRIPTS dsp=f2022a74 opcode 58000008 arg 00000000
lsi_scsi: Set ATN
lsi_scsi: SCRIPTS dsp=f2022a7c opcode 60000040 arg 00000000
lsi_scsi: Clear ACK
lsi_scsi: SCRIPTS dsp=f2022a84 opcode 9e030000 arg 0000ff08
lsi_scsi: Compare phase 6 != 6
lsi_scsi: Control condition failed
lsi_scsi: SCRIPTS dsp=f2022a8c opcode 7c027f00 arg 00000000
lsi_scsi: Read-Modify-Write reg 0x2 AND data8=0x7f sfbr=0x00
lsi_scsi: Read reg 2
lsi_scsi: Write reg 2 = 00
lsi_scsi: SCRIPTS dsp=f2022a94 opcode 0e000001 arg f2022cc0
lsi_scsi: MSG out len=1
lsi_scsi: error: Unimplemented message 0x0c
At this point it crashes.
0xc seems to be the SCSI BUS DEVICE RESET message.. can anyone shed
any light on what is going wrong here?
