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Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI |
Date: |
Wed, 02 Oct 2013 17:17:25 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 02/10/2013 17:12, Nathan Whitehorn ha scritto:
> I'm having some trouble with the VSCSI emulation in the pSeries machine.
> It seems that the emulated SCSI target device on the SRP IT_nexus
> properly distributes SCSI commands to its children but does not report
> them in response to a REPORT LUNS request. This happens because it
> forwards REPORT LUNs to target 0 on its child bus instead of answering
> the command itself.
How so? The SCSI emulation hijacks REPORT_LUNS and does not pass it
down to the device's alloc_req callback, but the request is still
processed as if it came to the device.
Can you give QEMU's command-line? Can you reproduce the same bug with
an x86 FreeBSD guest using virtio-scsi?
> This prevents at least FreeBSD from seeing any QEMU
> SCSI device that is not internally a LUN on QEMU target 0.
>
> I can try to draw up a patch, but it would be nice to know if a fix is
> already in progress first. There seemed to be some patches two years ago
> from Paolo Bonzini to add proper support for hierarchical LUNs, but they
> seem to have never been committed.
No, those were too complicated. Now I've just added channel= and lun=
properties to the scsi-disk device.
Paolo
- [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/02
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI,
Paolo Bonzini <=
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/02
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Paolo Bonzini, 2013/10/02
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/02
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Paolo Bonzini, 2013/10/03
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/03
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/05
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/05
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Paolo Bonzini, 2013/10/07
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nathan Whitehorn, 2013/10/18
- Re: [Qemu-ppc] Bug with REPORT LUNS in IBM VSCSI, Nikunj A Dadhania, 2013/10/04