RE: [Xen-devel] [rfc 00/18] ioemu: use devfn instead of slots as the unit for passthrough

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

Simon Horman <mailto:horms@xxxxxxxxxxxx> wrote:
> On Thu, Mar 05, 2009 at 05:31:15PM +0800, Jiang, Yunhong wrote:
>> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx <> wrote:
>>> On 05/03/2009 09:05, "Simon Horman" <horms@xxxxxxxxxxxx> wrote:
>>> 
>>>> * I have not accounted for MSI devices/functions at this time,
>>>>   but my understanding is that they don't need a GSI at all.
>>>>   So it should be just a matter of giving them a device
>>>>   and making sure nothing else uses it.
>>> 
>>> Depending on how critical your
>>> no-sharing-between-passthru-devices is, you
>>> might need to be careful with this. Just because a device is MSI-capable
>>> doesn't mean the guest OS will use it (I don't know how common
>>> that would be
>> 
>> I think most OS will support a option to disable MSI, like Vista or Linux.
> 
> So it is entirely possible that MSI won't be used on an MSI-capable
> function?  Is this true of SR-IOV (virtual) functions too?

I rememeber SR-IOV VF requires  MSI support. Maybe that means we can't disable 
MSI if we need SR-IOV.

Thanks
Yunhong Jiang

> 
> --
> Simon Horman
>  VA Linux Systems Japan K.K., Sydney, Australia Satellite Office
>  H: www.vergenet.net/~horms/             W: www.valinux.co.jp/en
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