[Qemu-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Qemu-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Gonglei (Arei)]

Hi all,
    My environment is xen-4.1.2 + qemu-1.2.2
	I made a pvscsi driver for Redhat guest, but I encountered a problem that I could see two scsi disks, one was simulated by QEMU, another was passthrough.
    Actually I want to unplug the scsi disk simulated. Any methods can solve the problem on the qemu upstream. Thanks!

Re: [Qemu-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Laszlo Ersek]

On 05/30/13 13:23, Gonglei (Arei) wrote:
> Hi all,
>     My environment is xen-4.1.2 + qemu-1.2.2
> 	I made a pvscsi driver for Redhat guest, but I encountered a problem that I could see two scsi disks, one was simulated by QEMU, another was passthrough.
>     Actually I want to unplug the scsi disk simulated. Any methods can solve the problem on the qemu upstream. Thanks!

Unless I'm misunderstanding you (which is more likely than not):
emulated devices (eg. NIC and IDE disks) are unplugged by the guest
kernel. See "arch/x86/xen/platform-pci-unplug.c".

The qemu side seems to be in "hw/xen/xen_platform.c".

Laszlo

Re: [Qemu-devel] [Xen-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Pasi Kärkkäinen]

On Thu, May 30, 2013 at 11:23:44AM +0000, Gonglei (Arei) wrote:
> Hi all,
>     My environment is xen-4.1.2 + qemu-1.2.2
> 	I made a pvscsi driver for Redhat guest, but I encountered a problem that I could see two scsi disks, one was simulated by QEMU, another was passthrough.
>     Actually I want to unplug the scsi disk simulated. Any methods can solve the problem on the qemu upstream. Thanks!
>

Are you actually using Xen *PVSCSI* (http://wiki.xen.org/wiki/Paravirtualized_SCSI),
or are you talking about Xen HVM guest with PV drivers for disk? 

-- Pasi

Re: [Qemu-devel] [Xen-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Konrad Rzeszutek Wilk]

On Thu, May 30, 2013 at 11:23:44AM +0000, Gonglei (Arei) wrote:
> Hi all,
>     My environment is xen-4.1.2 + qemu-1.2.2
> 	I made a pvscsi driver for Redhat guest, but I encountered a problem that I could see two scsi disks, one was simulated by QEMU, another was passthrough.
>     Actually I want to unplug the scsi disk simulated. Any methods can solve the problem on the qemu upstream. Thanks!

I would suggest you look at arch/x86/xen/platform-pci-unplug.c which
tells QEMU to unplug the IDE driver. You could implement a similar
mechanism in QEMU (and in the Linux kernel).

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
> 

Re: [Qemu-devel] [Xen-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu, just like unplug the ide disk?

[Gonglei (Arei)]

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com]
> Sent: Monday, June 03, 2013 9:16 PM
> To: Gonglei (Arei)
> Cc: qemu-devel@nongnu.org; xen-devel@lists.xen.org; Luonengjun; Jinwenwu
> Subject: Re: [Xen-devel] [PVSCSI]How to unplug scsi disk simulated by Qemu,
> just like unplug the ide disk?
> 
> On Thu, May 30, 2013 at 11:23:44AM +0000, Gonglei (Arei) wrote:
> > Hi all,
> >     My environment is xen-4.1.2 + qemu-1.2.2
> > 	I made a pvscsi driver for Redhat guest, but I encountered a problem that
> I could see two scsi disks, one was simulated by QEMU, another was
> passthrough.
> >     Actually I want to unplug the scsi disk simulated. Any methods can solve
> the problem on the qemu upstream. Thanks!
> 
> I would suggest you look at arch/x86/xen/platform-pci-unplug.c which
> tells QEMU to unplug the IDE driver. You could implement a similar
> mechanism in QEMU (and in the Linux kernel).
> 
Ok, thank you so much!

-Gonglei