linux-kernel - Re: [PATCH v1 2/2] vfio/pci: Emulate PASID/PRI capability for VFs

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Message-ID: <20200413032930.GB18479@araj-mobl1.jf.intel.com>
Date:   Sun, 12 Apr 2020 20:29:31 -0700
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     "Raj, Ashok" <ashok.raj@...ux.intel.com>
Cc:     Alex Williamson <alex.williamson@...hat.com>,
        "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Tian, Jun J" <jun.j.tian@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Wu, Hao" <hao.wu@...el.com>, Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH v1 2/2] vfio/pci: Emulate PASID/PRI capability for VFs

Hi Alex

Going through the PCIe Spec, there seems a lot of such capabilities
that are different between PF and VF. Some that make sense
and some don't.


On Sun, Apr 12, 2020 at 08:10:43PM -0700, Raj, Ashok wrote:
> 
> > 
> > I agree though, I don't know why the SIG would preclude implementing
> > per VF control of these features.  Thanks,
> > 

For e.g. 

VF doesn't have I/O and Mem space enables, but has BME
Interrupt Status
Correctable Error Reporting
Almost all of Device Control Register.

So it seems like there is a ton of them we have to deal with today for 
VF's. How do we manage to emulate them without any support for them 
in VF's? 


> 
> Cheers,
> Ashok