RE: SR-PCIM support in KVM

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> > > > As per the following link:
> > > > https://www.linux-kvm.org/images/6/6a/KvmForum2008$kdf2008_7.pdf
> > > >
> > > > It says that for software based virtual mailbox we require SR-PCIM
> > > > support.
> > > >
> > > > So for this purpose is SR-PCIM implemented as part of KVM ?
> > > > Or is there any other method that KVM provides for communication
> > > > between PF & VF ?
> > >
> > > Hi, SR-IOV is not part of KVM (the virtual machine monitor kernel module).
> > > In PCIe terms, when using KVM the "VI" or Virtualization
> > > Intermediary is the Linux VFIO driver.  SR-IOV management is split
> > > between the PF driver and VFIO.
> >
> > Thanks Paolo.
> >
> > If Linux VIFO driver acts as VI, as per spec SR-PCIM is "Software
> > responsible for the configuration of the SR-IOV capability, management
> > of Physical Functions and Virtual Functions" So if we use kvm who does above
> work of SR-PCIM ?
> 
> It's split between VFIO and the PF driver.
> 
> > Does VFIO driver provide any methods for PF & VF communication.
> 
> No, those are in the PF driver (ixgbe for example).
> 
Thanks Paolo
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