Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()

Thomas Gleixner
2021-12-01T22:03:09Z

On Wed, Dec 01 2021 at 14:49, Dave Jiang wrote:
> On 12/1/2021 2:44 PM, Thomas Gleixner wrote:
>> How that is backed on the host does not really matter. You can expose
>> MSI-X to the guest with a INTx backing as well.
>>
>> I'm still failing to see the connection between the 9 MSIX vectors and
>> the 2048 IMS vectors which I assume that this is the limitation of the
>> physical device, right?
>
> I think I was confused with what you were asking and was thinking you
> are saying why can't we just have MSIX on guest backed by the MSIX on
> the physical device and thought there would not be enough vectors to
> service the many guests. I think I understand what your position is now
> with the clarification above.

This still depends on how this overall discussion about representation
of all of this stuff is resolved.

>> What needs a subdevice to expose?

Can you answer that too please?

Thanks,

tglx