seL4/seL4 15.0.0

seL4 15.0.0

on GitHub

Announcing the release of seL4 15.0.0 with new features, new platforms, and minor fixes.

This is a breaking release.

Changes

• Add runtime domain schedule configuration.
  See RFC-20.
• libsel4: make thread-local IPC buffer optional (see LibSel4UseThreadLocals).
• The KernelAllowSMCCalls option can now be used for verification builds
• Update documentation on seL4_X86_EPT_VMAttributes
• Update documentation for seL4_VMEnter()
• Bitfield generator: support for simple arithmetic expressions and new field_ptr keyword for reducing the need for
  #ifdef in bitfield definitions
• Fix: Allow threads to enable the FPU for their own TCB. The API allowed this before, but the change would only take
  effect the next time the thread was scheduled.

Platforms

• Add support for Rock3b (AArch64)
• Add support for Banana Pi BPI-F3 (RISC-V)

X86

• Allow user space reads from VMX_CONTROL_SECONDARY_PROCESSOR_CONTROLS. Previously only writes were allowed.
• Do not force 64-bit VCPU mode for X86_64_VTX_64BIT_GUESTS to enable guests managing their own mode transition, e.g.
  for UEFI firmware.
• Allow user space reads and writes to VMX_CONTROL_ENTRY_CONTROLS field, e.g. for enabling long mode and loading of
  certain MSRs on VM Entry.
• Allow CR0.PE and CR0.PG to be cleared if "Unrestricted Guest" mode is supported by the host CPU. This mode allows
  guest software to run in unpaged protected mode or in real-address mode.
• Skip the boot time clock sync test on Qemu, because timing is too unreliable under simulation
• Improve boot code error reporting on UART

ARM

• Support for choosing between GICv2 and GICv3 on Qemu
• Avoid trapping CPACR_EL1 accesses in hypervisor mode
• Performance improvements for FPU switching

Upgrade Notes

If using domains, replace any custom domain_schedule.c file with initialisation code in user space, or use
corresponding features in user-space frameworks such as Microkit and CAmkES. With MCS, the domain duration is now
configured in timer ticks instead of microseconds.

Full changelog

Refer to the git log in
https://github.com/seL4/seL4 using git log 14.0.0..15.0.0

More details

See the
15.0.0 manual included in the release or ask on the mailing list!