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Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD d
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ? |
Date: |
Thu, 03 Nov 2011 08:49:36 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20110930 Thunderbird/7.0.1 |
On 11/02/2011 10:22 PM, Thomas Schmitt wrote:
Hi,
i wrote:
So how is this altered to 0x12 in the further course of processing ?
Paolo Bonzini wrote:
Because you're using an *IDE* (ATAPI) CD-ROM, not SCSI. See hw/ide/atapi.c.
You convinced me.
But this does not explain yet the difference in behavior of
both groups of IDE DVD-ROMs. Why are those of -drive if=scsi empty ?
They are not "of -drive if=scsi". They are "of -cdrom", and unlike the
SCSI ones they are always present, even if no -cdrom is given (you can
use -nodefaults to remove all default devices, including the IDE
CD-ROM). So if you specified "-drive if=scsi" *and* "-cdrom", you'd get
two non-empty drives.
Ok, in your counting I should have written 20 for IDE (0x12 + page number +
page size) and 22 for SCSI (0x14 + page number + page size).
Why the distinction by transport bus ? Mode page 2Ah is a matter
of the drive alone. MMC is independent of the bus.
It's just an artefact of having two separate implementations for ATAPI
and SCSI.
I did not yet find out, why the IDE drive emulation emits a Mode Data
Length of 0x22. With Page Length 0x12 it should have been 0x1a.
8 too many.
Yeah, looks like all the
case MODE_PAGE_R_W_ERROR: /* error recovery */
cpu_to_ube16(&buf[0], 16 + 6);
should have "- 2" instead of "+ 6".
Paolo
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, (continued)
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/02
- [Qemu-devel] Compile error, Frans de Boer, 2011/11/02
- Re: [Qemu-devel] Compile error, Anthony Liguori, 2011/11/02
- Re: [Qemu-devel] Compile error, Frans de Boer, 2011/11/02
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?,
Paolo Bonzini <=
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/03
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/03
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/03
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/03
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/04
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/04
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/04
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Paolo Bonzini, 2011/11/04
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/04
- Re: [Qemu-devel] Do you have a use for a tester of virtio-scsi with CD drives ?, Thomas Schmitt, 2011/11/04