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Xen RELEASE-4.21.1

Xen: RELEASE-4.21.1 Release

Release date:
March 26, 2026
Previous version:
RELEASE-4.21.0 (released November 18, 2025)
Magnitude:
2,892 Diff Delta
Contributors:
13 total committers
Data confidence:
Commits:
82 impacting commits

82 Commits in this Release

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

x86/msr: Change rdmsr() to have normal API
Authored June 23, 2018
Revert "xen/mm: allow deferred scrub of physmap populate allocated pages"
Authored March 26, 2026
x86/amd: Fix race editing DE_CFG
Authored December 3, 2025
x86/traps: Introduce FRED entrypoints
Authored December 24, 2024
x86/fsgsbase: Update fs/gs helpers to use wrmsrns()
Authored August 14, 2025
x86: Clamp bits in eflags more aggressively
Authored May 27, 2025
x86/pv: ERETU error handling
Authored August 13, 2025
xen/mm: remove aliasing of PGC_need_scrub over PGC_allocated
Authored February 11, 2026
x86/msr: Change wrmsr() to take a single parameter
Authored June 22, 2018
x86/pv: Guest exception handling in FRED mode
Authored August 11, 2025
x86/traps: Enable FRED when requested
Authored December 24, 2024
x86/traps: Make an IDT-specific #DB helper
Authored August 11, 2025
x86/fsgsbase: Split out __{rd,wr}gs_shadow() helpers
Authored August 14, 2025
x86/traps: Use fatal_trap() for #UD and #GP
Authored February 10, 2026
x86/traps: Don't configure Supervisor Shadow Stack tokens in FRED mode
Authored August 15, 2025
xen/mm: allow deferred scrub of physmap populate allocated pages
Authored February 11, 2026
x86/traps: Alter switch_stack_and_jump() for FRED mode
Authored May 26, 2025
kconfig: remove references to docs/misc/kconfig{,-language}.txt files
Authored November 25, 2025
x86/traps: Make an IDT-specific #PF helper
Authored August 11, 2025
tools/xenstored: fix live update
Authored February 17, 2026
x86/ucode: Support discrete modules being CPIO archives
Authored March 10, 2026
x86/boot: Document the ordering dependency of _svm_cpu_up()
Authored February 16, 2026
x86/pv: Deduplicate is_canonical_address() in do_set_segment_base()
Authored August 12, 2025
libxl: constify some local variables for building with glibc 2.43
Authored February 26, 2026
x86/domain: adjust limitation on shared_info allocation below 4G
Authored February 11, 2026
x86/boot: Use RSTORSSP to establish SSP
Authored May 26, 2025
x86/traps: Move traps_init() earlier on boot
Authored August 15, 2025
x86/fsgsbase: Make SHADOW_GS accesses safe under FRED
Authored August 18, 2025
x86/fsgsbase: Improve code generation in read_registers()
Authored August 12, 2025
tools/xenstored: fix canonicalize() error testing
Authored February 12, 2026
systemd: fall back to default system-sleep dir without systemd-devel
Authored December 5, 2025
x86/p2m: issue a sync flush before freeing paging pages
Authored February 17, 2026
x86/boot: Move gdt_l1e caching out of traps_init()
Authored February 13, 2026
xen/x86: Pass TPM ACPI table to PVH dom0
Authored January 13, 2026
vpci/msix: check for BARs enabled in vpci_make_msix_hole
Authored March 10, 2026
x86/amd: Stop updating the Zenbleed mitigation dynamically
Authored December 3, 2025
ARM: Drop ThumbEE support
Authored March 26, 2026
tools/ocaml: fix 32-bit truncation bug in stub_xc_domain_setmaxmem()
Authored February 5, 2026
x86/mm: update log-dirty bitmap when manipulating P2M
Authored January 13, 2026
x86/vpmu: Expose up to 8 Intel event selectors in PV Dom0
Authored March 26, 2026

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Top Contributors in RELEASE-4.21.1

andyhhp
jbeulich
royger
jgross1
dimaprkp4k
marmarek
xakep-amatop
jandryuk
stewdk
TSnake41

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