On 06/06/2016 16:22, Hannes Reinecke wrote:
> So either we dig into what went wrong with qemu 0.8, or we figure out
> from which qemu version things start to behave nicely, and blacklist
> earlier versions.
>
> > > Either way, this patch is wrong.
> >
> > If we can identify which versions work, we can update it. Otherwise
> > I think we have to be conservative.
>
> So far we just had this single report where the upstream kernel didn't
> work correctly with a (really old) version of qemu.
> Hardly justifying blacklisting qemu CD-ROM in general.
To further complicate the matter there are two QEMU MMC devices:
1) ATAPI
- vendor "QEMU" / product name "QEMU CD-ROM" before QEMU 0.10.0
- vendor "QEMU" / product name "QEMU DVD-ROM" since QEMU 0.10.0
2) native SCSI
- vendor "QEMU" / product name "QEMU CD-ROM"
VPD in the SCSI CD-ROM probably has always worked, but I would blacklist
up to 0.11 inclusive just to be safe. Those versions are dead anyway.
VPD in the ATAPI CD-ROM is newer, and that's where the bug was reported on:
> [ 4.439488] ata2.00: ATAPI: QEMU CD-ROM, 0.8.2, max UDMA/100
> [ 4.443649] ata2.00: configured for MWDMA2
> [ 4.450267] scsi 1:0:0:0: CD-ROM QEMU QEMU CD-ROM 0.8. PQ: 0 ANSI: 5
> [ 4.464317] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> [ 4.464319] ata2.00: BMDMA stat 0x5
> [ 4.464339] ata2.00: cmd a0/01:00:00:00:01/00:00:00:00:00/a0 tag 0 dma 16640 in
> [ 4.464339] Inquiry 12 01 00 00 ff 00res 48/20:02:00:24:00/00:00:00:00:00/a0 Emask 0x2 (HSM violation)
> [ 4.464341] ata2.00: status: { DRDY DRQ }
For ATAPI, you have to blacklist all versions up to 2.2 inclusive.
This gives:
- QEMU / QEMU CD-ROM / 0.8. (this is IDE and SCSI)
- QEMU / QEMU CD-ROM / 0.9. (this is IDE and SCSI)
- QEMU / QEMU CD-ROM / 0.10 (this is SCSI only)
- QEMU / QEMU CD-ROM / 0.11 (this is SCSI only)
- QEMU / QEMU DVD-ROM / 0.8. (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.9. (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.10 (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.11 (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.12 (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.13 (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.14 (this is IDE only)
- QEMU / QEMU DVD-ROM / 0.15 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.0 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.1 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.2 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.3 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.4 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.5 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.6 (this is IDE only)
- QEMU / QEMU DVD-ROM / 1.7 (this is IDE only)
- QEMU / QEMU DVD-ROM / 2.0 (this is IDE only)
- QEMU / QEMU DVD-ROM / 2.1 (this is IDE only)
- QEMU / QEMU DVD-ROM / 2.2 (this is IDE only)
Thanks,
Paolo
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