linux-kernel - RE: [RFC v1 0/2] vfio/pci: expose device's PASID capability to VMs

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Date:   Sat, 8 Feb 2020 07:46:28 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>
CC:     "Tian, Kevin" <kevin.tian@...el.com>,
        "jacob.jun.pan@...ux.intel.com" <jacob.jun.pan@...ux.intel.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Tian, Jun J" <jun.j.tian@...el.com>,
        "Sun, Yi Y" <yi.y.sun@...el.com>,
        "jean-philippe.brucker@....com" <jean-philippe.brucker@....com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC v1 0/2] vfio/pci: expose device's PASID capability to VMs

Hi Alex,

Any comment on this series?

Regards,
Yi Liu

> From: Liu, Yi L
> Sent: Wednesday, January 29, 2020 8:19 PM
> To: alex.williamson@...hat.com; eric.auger@...hat.com
> Subject: [RFC v1 0/2] vfio/pci: expose device's PASID capability to VMs
> 
> Shared Virtual Addressing (SVA), a.k.a, Shared Virtual Memory (SVM) on Intel
> platforms allows address space sharing between device DMA and applications. SVA
> can reduce programming complexity and enhance security.
> 
> To enable SVA, device needs to have PASID capability, which is a key capability for
> SVA. This patchset exposes the device's PASID capability to guest instead of hiding it
> from guest.
> 
> The second patch emulates PASID capability for VFs (Virtual Function) since VFs don't
> implement such capability per PCIe spec. This patch emulates such capability and
> expose to VM if the capability is enabled in PF (Physical Function).
> 
> However, there is an open for PASID emulation. If PF driver disables PASID capability
> at runtime, then it may be an issue. e.g. PF should not disable PASID capability if
> there is guest using this capability on any VF related to this PF. To solve it, may need
> to introduce a generic communication framework between vfio-pci driver and PF
> drivers. Please feel free to give your suggestions on it.
> 
> Liu Yi L (2):
>   vfio/pci: Expose PCIe PASID capability to guest
>   vfio/pci: Emulate PASID/PRI capability for VFs
> 
>  drivers/vfio/pci/vfio_pci_config.c | 321
> ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 318 insertions(+), 3 deletions(-)
> 
> --
> 2.7.4