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Xen RELEASE-4.21.0

Xen: RELEASE-4.21.0 Release

Release date:
November 18, 2025
Previous version:
RELEASE-4.20.3 (released March 26, 2026)
Magnitude:
4,941 Diff Delta
Contributors:
20 total committers
Data confidence:
Commits:
209 impacting commits

209 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

hvmloader: fix SMBIOS table length checks
Authored September 3, 2025
CI: avoid repacking initrd as part of the test job
Authored April 11, 2025
x86/stubs: Introduce place_ret() to abstract away raw 0xc3's
Authored May 4, 2025
x86/spec-ctrl: Mitigate Transitive Scheduler Attacks
Authored August 29, 2024
x86/thunk: Build Xen with Return Thunks
Authored April 7, 2025
x86/ucode: Relax digest check when Entrysign is fixed in firmware
Authored February 28, 2025
x86/idle: Remove broken MWAIT implementation
Authored July 1, 2025
x86/ucode: Digests for TSA microcode
Authored September 27, 2024
x86/idle: Implement a new MWAIT IPI-elision algorithm
Authored July 1, 2025
CI: save toolstack artifact as cpio.gz
Authored April 11, 2025
CI: Switch to new argo artefact
Authored April 10, 2025
xen/softirq: Rework arch_skip_send_event_check() into arch_set_softirq()
Authored July 1, 2025
x86/idle: Rearrange VERW and MONITOR in mwait_idle_with_hints()
Authored April 2, 2025
update Xen version to 4.20.1-pre
Authored March 20, 2025
x86/guest: Remove use of the Xen hypercall_page
Authored April 21, 2025
x86/idle: Remove MFENCEs for CLFLUSH_MONITOR
Authored April 1, 2025
x86/ucode: Cross check the minimum revision
Authored October 17, 2025
x86/cpu-policy: Simplify logic in guest_common_default_feature_adjustments()
Authored June 27, 2025
x86/alternative: Support replacements when a feature is not present
Authored April 21, 2025
x86/vpci: fix handling of BAR overlaps with non-hole regions
Authored June 26, 2025
x86/idle: Convert force_mwait_ipi_wakeup to X86_BUG_MONITOR
Authored July 1, 2025
x86/idle: Fix buggy "x86/mwait-idle: enable interrupts before C1 on Xeons"
Authored July 2, 2025
automation/cirrus-ci: use matrix keyword to generate per-version build tasks
Authored March 15, 2025
CI: Build with --prefix=/usr rather than setting LD_LIBRARY_PATH
Authored April 15, 2025
CI: Rename intermediate artefacts in qemu-* scripts
Authored April 12, 2025
x86emul: adjust BSF/BSR/LZCNT/TZCNT behavior as to EFLAGS
Authored July 22, 2025
x86/PVH: account for module command line length
Authored March 27, 2025
PPC: Activate UBSAN in testing
Authored February 26, 2025
x86/idle: Move monitor()/mwait() wrappers into cpu-idle.c
Authored April 1, 2025
IOMMU/x86: the bus-to-bridge lock needs to be acquired IRQ-safe
Authored February 27, 2025
mktarball: Drop double-processing of the archive
Authored November 13, 2025
x86/mce: Adjustments to intel_init_ppin()
Authored September 3, 2025
Revert part of "x86/mwait-idle: disable IBRS during long idle"
Authored June 24, 2025
automation: skip building domU if there is no test defined for it
Authored February 19, 2025
x86/cpu-policy: Rearrange guest_common_*_feature_adjustments()
Authored June 27, 2025
x86/mwait-idle: Add AlderLake-N support
Authored July 22, 2025
Update to Xen 4.20
Authored March 4, 2025
vpci/msix: improve handling of bogus MSI-X capabilities
Authored October 21, 2025
Update to Xen 4.21
Authored November 18, 2025
CHANGELOG.md: Finalize changes in 4.20 release cycle
Authored February 27, 2025

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Top Contributors in RELEASE-4.21.0

andyhhp
marmarek
jbeulich
royger
wbenny
rosslagerwall
zhang-rui
oleksii-kurochko-ff5d
etrian-dev
sstabellini

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