This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1954473
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1954473
Title:
KVM Shared Virtual Memory (SVM)
Status in linux package in Ubuntu:
Incomplete
Bug description:
SVM is short for shared virtual memory. This task is aiming at
enabling SVM support for assigned devices on KVM. Example: assign a
GPU from host to guest, the application program running in guest could
share its virtual memory address to the assigned device.
Latest update: extend the vIOMMU in QEMU to support SVM feature.
1. Description of the Technology.
SVM is shorted for Shared Virtual Memory, it is a VT-d feature that allows
sharing application virtual address space with the I/O device. The feature
works with the PCI sig Process Address Space ID (PASID). SVM has the following
benefits:
• Programmer gets a consistent view of memory across host application and
device
• Efficient access to data, avoiding pining or copying overheads
2. Use cases that is important for this technology (aka, why is this
technology needed).
Intel has multiple IPs that would support SVM, and the usage in guest is also
a demand. e.g. QAT, it is usual to assign a QAT to guest and requires SVM to
benefit from its advantages.
3. General design description (components modified: kvm, qemu-kvm, driver,
libvirt (and other userland libraries))
Modified components would include: qemu-kvm, vfio driver, iommu driver
Target Linux 5.19
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