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Re: [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarc
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error |
Date: |
Tue, 5 Jul 2016 16:02:30 +0100 |
On 5 July 2016 at 15:41, Tom Hanson <address@hidden> wrote:
> As noted above, virtio-scsi-pci uses a bus address as part of the
> internal ID string while virtio-scsi-device does not.
>
> * Is this difference intentional?
Probably not.
> * Are they intended to support different use cases? If so, what?
virtio-scsi-device is a "virtio backend" (other backends
include char, block and net devices), which plugs into a
"virtio bus". Virtio buses are provided by "virtio transports",
which can be PCI, s390 CCW, or virtio-mmio, and any particular
virtio bus has either 0 or 1 virtio backends on it.
The general idea is that this is a clean-ish separation between
the "what is this virtio device doing" and "how exactly do you
access it". virtio-scsi-pci is one of the family of virtio-*-pci
devices which combine a virtio-pci transport and a virtio-foo
backend in one convenient package -- we provide these (a) for
backward compatibility with old command lines etc from before
we made the backend/transport split and (b) for convenience
since the command lines are shorter than if you specify
the transport and backend separately manually.
(Note that a virtio-pci transport is a pci device, not a
pci bus -- it plugs into a pci bus on one and has a
virtio-bus on the other.)
thanks
-- PMM
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Tom Hanson, 2016/07/01
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Dr. David Alan Gilbert, 2016/07/01
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Dr. David Alan Gilbert, 2016/07/01
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Tom Hanson, 2016/07/01
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Laszlo Ersek \(Red Hat\), 2016/07/02
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Tom Hanson, 2016/07/05
- Re: [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error,
Peter Maydell <=
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Dr. David Alan Gilbert, 2016/07/05
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Tom Hanson, 2016/07/05
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Laszlo Ersek \(Red Hat\), 2016/07/05
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Laszlo Ersek \(Red Hat\), 2016/07/05
- [Qemu-devel] [Bug 1594239] Re: After adding more scsi disks for Aarch64 virtual machine, start the VM and got Qemu Error, Tom Hanson, 2016/07/05