[Xen-users] AW: Another question about msi.

[Carsten Schiers <carsten@xxxxxxxxxx>]

Thanks, so I will give it a try. 

In fact I never found someting in docs that say: don't use shared-interrupt 
devices 
in different domains. But you will find some hints in the internet not to do so.

I remeber something line an issue when shutting down a DomU that includes one 
device, 
that the other device doesn't work any longer, as the GSI is disabled in Dom0. 
Might 
be a bug. I never understand why it shouldn't work, as I think the transfer 
from IRQ
to event channel is done somewhere in Xen or Dom0.

My hope was that MSI will be much clearer, allowing me to use the PCI slot, 
whilst
the NICs are using MSI. Would be nice to put in another NIC or TV or Fax or ...

BR,
Carsten.

----- Originalnachricht -----
Von: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Gesendet: Fre, 27.3.2009 02:21
An: Carsten Schiers <carsten@xxxxxxxxxx> ; xen-users 
<xen-users@xxxxxxxxxxxxxxxxxxx>
Betreff: RE: Another question about msi.



>-----Original Message-----
>From: Carsten Schiers [mailto:carsten@xxxxxxxxxx] 
>Sent: 2009å3æ27æ 4:40
>To: xen-users
>Cc: Jiang, Yunhong
>Subject: Another question about msi.
>
>Antoher question regarding MSI support.
> 
>When I have a motherboard where two PCIe slots and one PCI 
>slot share an 
>interrupt when using current
>Xen and kernel with GSI, when I now use Xen 3.4-unstable and latest 
>kernel, it will use the MSI (as the
>Two PCIe slots are occupied by realtek NICs and their modules are MSI 
>aware). Two different MSI show up 
>in /proc/interrupts. 
>
>Does this now mean that I can pass-through the PCI slot into a 
>pv DomU, 
>because the GSI is now exclusively
>used by the PCI slot (what I could not do before, as NICs shared GSI 
>with the network cards)?

I suspect even shared-interrupt devices can be assigned to different guest.

BTW, if a device can be assigned to a guest are determined by many factor, like 
FLR support etc (at least for HVM domain).

>
>For your Info: Xen 3.3.1 and latest kernel will not work for me.
>
>Thanks,
>Carsten.
>
>
>
>

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