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@github-actions github-actions released this 16 Feb 18:20
v38.0
ef4fbf0

This release has been tracked in our roadmap
project as iteration
v38.0. The following user visible changes have been made:

Group Rate Limiter on Block Devices

Users now can throttle a group of block devices with the new
--rate-limiter-group option. Details can be found from the I/O
Throttling documentation

CPU Pinning Support for Block Device Worker Thread

Users now have the option to pin virt-queue threads for block devices
to specific host cpus.

Optimized Boot Time with Parallel Memory Prefault

The boot time with prefault option enabled is optimized via parallel
memory prefault.

New 'debug-console' Device

A 'debug-console' device is added to provide a user-configurable debug
port for logging guest information. Details can be found from the Debug
IO Ports documentation.

Improved VFIO Device Support

All non-emulated MMIO regions of VFIO devices are now mapped to the VFIO
container, allowing PCIe P2P between all VFIO devices on the same
VM. This is required for a wide variety of multi-GPU workloads involving
GPUDirect P2P (DMA between two GPUs), GPUDirect RDMA (DMA between a GPU
and an IB device).

Extended CPU Affinity Support

Users now can set the vcpu affinity to a host CPU with index larger
than 255.

Notable Bug Fixes

  • Enable HTT flag to avoid crashing cpu topology enumeration software
    such as hwloc in the guest (#6146)
  • Fix several security advisories from dependencies (#6134, #6141)
  • Handle non-power-of-two CPU topology properly (#6062)
  • Various bug fixes around virtio-vsock(#6080, #6091, #6095)
  • Enable nested virtualization on AMD if supported (#6106)
  • Align VFIO devices PCI BARs naturally (#6196)

Contributors

Many thanks to everyone who has contributed to our release:

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