The introduction of system technologies that improve devices capabilities and performance (eg PCI ATS (Address Translation Service)/PRI(Page Request Interface), enabling Shared Virtual Memory (SVM) between devices and CPUs) is making PCI devices, the system IOMMUs they are connected to and the VFIO layer used to managed them (for userspace and device passthrough) more and more tightly coupled, with related kernel interfaces that have to be designed in-sync for all three subsystems.
The kernel patches aimed at enabling the related technologies affect VFIO/IOMMU/PCI subsystems and interfaces, which require a certain amount of coordination between kernel subsystems to make sure that the related interfaces are designed to work in a seamless manner.
The Linux Plumbers 2017 VFIO/IOMMU/PCI track will therefore focus on promoting discussions on the current kernel patches aimed at VFIO/IOMMU/PCI subsystems with specific sessions targeting discussion for kernel patches that enable technology (ie Shared Virtual Memory - SVM) requiring the three subsystems coordination; the microconference will also cover VFIO/IOMMU/PCI subsystem specific tracks to debate patches status for the respective subsystems plumbing.
The tentative schedule will provide an update on the current state of VFIO/IOMMU/PCI kernel subsystems followed by discussion of current issues in the proposed topics, starting with a joint discussion on patches aimed at enabling Shared Virtual Memory (SVM) technologies.
Topics that are under consideration for this microconf include (but are not limited to):
* VFIO
* IOMMU
* PCI
* NVMe Surprise Removal
Please add your topics here:
* SVM Virtualization (Yi Liu yi.l.liu@intel.com): status update based on Intel vIOMMU implementation. take the chance to finalize IOMMU/VFIO APIs which should support both emulated IOMMUs and also virtio-IOMMU.
* IOMMU API (Jacob Pan jacob.jun.pan@linux.intel.com): IOMMU API extensions for supporting guest SVM, bind PASID, fault notifications, and invalidation passdown.
* Zero-copy Receive API (Kalman Methmeth@il.ibm.com): Define interfaces needed to leverage receive-side steering abilities of modern high speed network cards to implement zero-copy receive for virtio-net and vhost.
* PCI error reporting (Kyle McMartin jkkm@fb.com, Jes Sorensen jsorensen@fb.com): PCI Express Root Port Advanced Error Reporting currently only supports reporting errors to the console. Having to monitor console logs is tedious and complicated when running a large data centre. We would like to propose adding software counters to the PCIAER driver and make these accessible via sysfs.
* NVMe Surprise removal (Shyam Iyer shyam.iyer@dell.com): Discuss issues related to supporting NVMe surprise removal.
Bjorn Helgaas bhelgaas@google.com Lorenzo Pieralisi lorenzo.pieralisi@arm.com Joerg Roedel joro@8bytes.org Alex Williamson alex.williamson@redhat.com