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Xen 4.21 Development Update [March-April]

Hello everyone,
This email only tracks big items for xen.git tree. Please reply for items you 
would like to see in 4.21 so that people have an idea what is going on and
prioritise accordingly.

You're welcome to provide description and use cases of the feature you're
working on.

= Timeline =

Suggested timeline could be found here:
https://lore.kernel.org/xen-devel/666e3f49-2f92-4828-8897-8579832bcaa2@xxxxxxxxx/T/#u

The following items ( the links for them could be found int the list below )
were moved to completed:
  [since 4.20 relese - May 6]:
    * Hypervisor:
      - Move parts of Arm's Dom0less to common code
      - remove libxenctrl usage from xenstored
    * Arm:
      - Enable early bootup of Armv8-R AArch32 systems
    * x86:
      - x86/HVM: emulation (MMIO) improvements
    * RISC-V:
      - RISC-V some preinit calls.
      - Fixes for UBSAN & GCOV support for RISC-V.

Some new items added since 4.20 release:
 * Hypervisor:
   - tools: remove qemu-traditional
   - Physical address hypercall ABI ("HVMv2")
   - xen: Untangle mm.h
   - xen: introduce CONFIG_SYSCTL
   - Add support for exact-node memory claims
   - Several CI cleanups and improvements, plus yet another new runner
 * x86:
   - x86/EFI: prevent write-execute sections
   - x86: Trenchboot Secure Launch DRTM (Xen)
   - Hyperlaunch device tree for dom0 (v6)
   - amd-cppc CPU Performance Scaling Driver (v4)
   - Hyperlaunch domain builder
   - kexec: add kexec support to Mini-OS
   - xen: cache control improvements (should be moved to "Hypervisor"?)
   - x86: generate xen.efi image with no write-execute sections
   - x86/asm: cleanups after toolchain baseline upgrade
 * Arm:
   - Add support for R-Car Gen4 PCI host controller (v4)
   - FF-A VM to VM support (v5)
   - First chunk for Arm R82 and MPU support (v4)
   - ARM split hardware and control domains (v5)
   - MPU mm subsistem skeleton
 * RISC-V:
   - riscv: introduce basic UART support and interrupts for hypervisor mode 

* Full list of items : *

= Projects =

== Hypervisor ==

* tools: remove qemu-traditional
  - Juergen Gross <jgross@xxxxxxxx>
  - https://lore.kernel.org/xen-devel/20250429110636.30518-4-jgross@xxxxxxxx/ 

* Physical address hypercall ABI ("HVMv2")
  - Teddy Astie
  - https://lore.kernel.org/xen-devel/cover.1744981654.git.teddy.astie@xxxxxxxxxx/ 

* xen: Untangle mm.h
  -  Andrew Cooper
  - https://lore.kernel.org/xen-devel/20250312174513.4075066-1-andrew.cooper3@xxxxxxxxxx/ 

* xen: introduce CONFIG_SYSCTL (v3)
  -  Penny Zheng
  - https://lore.kernel.org/xen-devel/20250421073723.3863060-1-Penny.Zheng@xxxxxxx/ 
  - https://patchew.org/Xen/20250421073723.3863060-1-Penny.Zheng@xxxxxxx/

* Add support for exact-node memory claims
  -  Alejandro Vallejo
  - https://lore.kernel.org/xen-devel/20250314172502.53498-1-alejandro.vallejo@xxxxxxxxx/   - https://patchew.org/Xen/20250314172502.53498-1-alejandro.vallejo@xxxxxxxxx/ 

* Several CI cleanups and improvements, plus yet another new runner
  - Marek Marczykowski-Górecki
  - https://lore.kernel.org/xen-devel/cover.7da1777882774486a13e6f39ff4a2096f6b7901e.1744028549.git-series.marmarek@xxxxxxxxxxxxxxxxxxxxxx/   - https://patchew.org/Xen/cover.7da1777882774486a13e6f39ff4a2096f6b7901e.1744028549.git-series.marmarek@xxxxxxxxxxxxxxxxxxxxxx/ 

* xen/console: cleanup console input switch logic
  - Denis Mukhin
  - https://lore.kernel.org/xen-devel/20250331230508.440198-1-dmukhin@xxxxxxxx/ 

*  Remove the directmap (v5)
  -  Alejandro Vallejo
  - https://lore.kernel.org/xen-devel/20250108151822.16030-1-alejandro.vallejo@xxxxxxxxx/ 

*  automation: Refresh the remaining Debian containers (v2)
  -  Javi Merino
  - https://lore.kernel.org/xen-devel/cover.1730743077.git.javi.merino@xxxxxxxxx/T/#m5d9acb7cf5db3c2be3d6527de14b69b07812314e 

*  GRUB: Supporting Secure Boot of xen.gz (v1)
  -  Ross Lagerwall
  - https://patchew.org/Xen/20240313150748.791236-1-ross.lagerwall@xxxxxxxxxx/ 

*  MSI-X support with qemu in stubdomain, and other related changes (v8)
  -  Marek Marczykowski-Górecki
  - https://lore.kernel.org/xen-devel/cover.33fb4385b7dd6c53bda4acf0a9e91748b3d7b1f7.1715313192.git-series.marmarek@xxxxxxxxxxxxxxxxxxxxxx/ 
  -  Only automation patch left to be reviewed/merged.

*  [RFC] Introduce xenbindgen to autogen hypercall structs (v1)
  -  Alejandro Vallejo
  - https://patchew.org/Xen/20241115115200.2824-1-alejandro.vallejo@xxxxxxxxx/ 

*  Introduce NS8250 UART emulator (v2)
  -  Denis Mukhin
  - https://patchew.org/Xen/20241205-vuart-ns8250-v1-0-e9aa923127eb@xxxxxxxx/ 

=== x86 ===

* x86/EFI: prevent write-execute sections
  - Roger Pau Monne <roger.pau@xxxxxxxxxx>
  - https://lore.kernel.org/xen-devel/20250401130840.72119-1-roger.pau@xxxxxxxxxx/ 

* x86: Trenchboot Secure Launch DRTM (Xen)
  - Sergii Dmytruk
  - https://patchew.org/Xen/cover.1745172094.git.sergii.dmytruk@xxxxxxxxx/
  - https://lore.kernel.org/xen-devel/cover.1745172094.git.sergii.dmytruk@xxxxxxxxx/ 

* Hyperlaunch device tree for dom0 (v6)
  - Alejandro Vallejo
  - https://patchew.org/Xen/20250429123629.20839-1-agarciav@xxxxxxx/
  - https://lore.kernel.org/xen-devel/20250429123629.20839-1-agarciav@xxxxxxx/ 

* amd-cppc CPU Performance Scaling Driver (v4)
  - Penny Zheng
  - https://lore.kernel.org/xen-devel/20250414074056.3696888-1-Penny.Zheng@xxxxxxx/ 
  - https://patchew.org/Xen/20250414074056.3696888-1-Penny.Zheng@xxxxxxx/

* Hyperlaunch domain builder
  - Daniel P. Smith
  - https://patchew.org/Xen/20250419220820.4234-1-dpsmith@xxxxxxxxxxxxxxxxxxxx/ 

* kexec: add kexec support to Mini-OS
  - Juergen Gross <jgross@xxxxxxxx>
  - https://lore.kernel.org/xen-devel/20250321092451.17309-1-jgross@xxxxxxxx/ 

* xen: cache control improvements
  - Roger Pau Monne
  - https://lore.kernel.org/xen-devel/20250506083148.34963-1-roger.pau@xxxxxxxxxx/ 

* x86: generate xen.efi image with no write-execute sections
  - Roger Pau Monne
  - https://lore.kernel.org/xen-devel/20250318173547.59475-1-roger.pau@xxxxxxxxxx/ 

* x86/asm: cleanups after toolchain baseline upgrade
  - Denis Mukhin
  - https://lore.kernel.org/xen-devel/20250403182250.3329498-1-dmukhin@xxxxxxxx/ 

*  Expose consistent topology to guests (v7)
  -  Alejandro Vallejo
  - https://patchew.org/Xen/20241021154600.11745-1-alejandro.vallejo@xxxxxxxxx/ 

*  Boot modules for Hyperlaunch (v9)
  -  Daniel P. Smith
  - https://patchew.org/Xen/20241115131204.32135-1-dpsmith@xxxxxxxxxxxxxxxxxxxx/ 

*  Address Space Isolation FPU preparations (v2->v3)
  -  Alejandro Vallejo
  - https://patchew.org/Xen/20250110132823.24348-1-alejandro.vallejo@xxxxxxxxx/ 

*  x86/alternatives: Adjust all insn-relative fields (v2)
  -  Andrew Cooper
  - https://lore.kernel.org/xen-devel/20241002152725.1841575-1-andrew.cooper3@xxxxxxxxxx/T/#mac2deaea7e02a343210d61887486433d946ad129 

*  x86emul: misc additions (v7)
  -  Jan Beulich
  - https://patchew.org/Xen/3a25cd59-e1cb-4bfc-b868-fb11599d22f5@xxxxxxxx/

*  x86: support AVX10 (v3)
  -  Jan Beulich
  - https://patchew.org/Xen/516b7f9a-048e-409d-8a4e-89aeb8ffacc4@xxxxxxxx/

*  VT-d: SATC handling; ATS: tidying (v2)
  -  Jan Beulich
  - https://patchew.org/Xen/64b028be-2197-4951-ae5b-32f9eabfa84a@xxxxxxxx/

*  x86: parallelize AP bring-up during boot (v1)
  -  Krystian Hebel
  - https://lore.kernel.org/xen-devel/cover.1699982111.git.krystian.hebel@xxxxxxxxx/ 

*  x86/spec-ctrl: IBPB improvements (v4)
  -  Jan Beulich
  - https://patchew.org/Xen/06591b64-2f05-a4cc-a2f3-a74c3c4a76d6@xxxxxxxx/

*  Move some boot code from assembly to C (v2)
  -  Frediano Ziglio
  - https://patchew.org/Xen/20241122093358.478774-1-frediano.ziglio@xxxxxxxxx/ 

*  Hyperlaunch device tree for dom0 (v2 -> v6)
  -  Alejandro Vallejo
  - https://patchew.org/Xen/20250429123629.20839-1-agarciav@xxxxxxx/

*  x86: memcpy() / memset() (non-)ERMS flavors plus fallout (v4)
  -  Jan Beulich
  - https://patchew.org/Xen/14b65231-b83b-43fb-bbcf-dec5c07d285b@xxxxxxxx/

*  amd-pstate CPU Performance Scaling Driver (v1)
  -  Penny Zheng
  - https://patchew.org/Xen/20241203081111.463400-1-Penny.Zheng@xxxxxxx/

* x86/efi: Fix booting when NX is disabled (v1)
  - Andrew Cooper
  - https://patchew.org/Xen/20240722101838.3946983-1-andrew.cooper3@xxxxxxxxxx/ 

=== ARM ===

* Add support for R-Car Gen4 PCI host controller (v4)
  - Mykyta Poturai
  - https://lore.kernel.org/xen-devel/cover.1745402473.git.mykyta_poturai@xxxxxxxx/   - https://patchew.org/Xen/cover.1745402473.git.mykyta._5Fpoturai@xxxxxxxx/ 

* FF-A VM to VM support (v5)
  - Bertrand Marquis <bertrand.marquis@xxxxxxx>
  - https://lore.kernel.org/xen-devel/cover.1744787720.git.bertrand.marquis@xxxxxxx/ 
  - https://patchew.org/Xen/cover.1744787720.git.bertrand.marquis@xxxxxxx/

* First chunk for Arm R82 and MPU support (v4)
  - Luca Fancellu
  - https://lore.kernel.org/xen-devel/20250429152057.2380536-1-luca.fancellu@xxxxxxx/ 
  - https://patchew.org/Xen/20250429152057.2380536-1-luca.fancellu@xxxxxxx/

* ARM split hardware and control domains (v5)
  - Jason Andryuk
  - https://lore.kernel.org/xen-devel/20250416212911.410946-1-jason.andryuk@xxxxxxx/ 
  - https://patchew.org/Xen/20250416212911.410946-1-jason.andryuk@xxxxxxx/

* MPU mm subsistem skeleton
  - Luca Fancellu
  - https://lore.kernel.org/xen-devel/20250312135258.1815706-1-luca.fancellu@xxxxxxx/ 
  - https://patchew.org/Xen/20250312135258.1815706-1-luca.fancellu@xxxxxxx/

*  Add Virtio-PCI for dom0less on ARM (v1)
  -  Edgar E. Iglesias
  - https://lore.kernel.org/xen-devel/20240924162359.1390487-1-edgar.iglesias@xxxxxxxxx/T/#mfa148991b9408f223a079d4cef610244d5b04c2b   - https://patchew.org/Xen/20240924162359.1390487-1-edgar.iglesias@xxxxxxxxx/ 

*  PCI devices passthrough on Arm, part 3 (v16->v20)
  -  Stewart Hildebrand
  - https://patchew.org/Xen/20250418185840.335816-1-stewart.hildebrand@xxxxxxx/   - https://lore.kernel.org/xen-devel/20250418185840.335816-1-stewart.hildebrand@xxxxxxx/ 
  -  last patch waiting to be merged?

*  DOMCTL-based guest magic region allocation for 11 domUs (v4)
  -  Henry Wang
  - https://patchew.org/Xen/20240409045357.236802-1-xin.wang2@xxxxxxx/

=== RISCV ===
* riscv: introduce basic UART support and interrupts for hypervisor mode (v2) 
  -  Oleksii Kurochko
  - https://lore.kernel.org/xen-devel/cover.1746530883.git.oleksii.kurochko@xxxxxxxxx/T/#m9f3affc0f8ded50ab26c0842613b553b56bce782 

=== PPC ===

*  Early Boot Allocation on Power (v5)
  -  Shawn Anastasio
  - https://lore.kernel.org/xen-devel/cover.1727388925.git.sanastasio@xxxxxxxxxxxxxxxxxxxxx/T/#m8cac91a93b56a359fa2d5f08596c4be61dca290d   - https://patchew.org/Xen/cover.1727388925.git.sanastasio@xxxxxxxxxxxxxxxxxxxxx/ 

== Completed ==

=== Hypervisor ===

*  remove libxenctrl usage from xenstored (v8)
  -  Juergen Gross
  - https://lore.kernel.org/xen-devel/20250204113407.16839-1-jgross@xxxxxxxx/
* xen/config.h: Move BITS_PER_* definitions from asm/config.h to xen/config.h 
  - Oleksii Kurochko
  - https://lore.kernel.org/xen-devel/6b21fb046cf1c8ca760f5ad72fa3cc13b59c4069.1743092485.git.oleksii.kurochko@xxxxxxxxx/ 

* Move parts of Arm's Dom0less to common code
  -  Oleksii Kurochko
  - https://patchew.org/Xen/cover.1746468003.git.oleksii.kurochko@xxxxxxxxx/   - https://lore.kernel.org/xen-devel/cover.1746468003.git.oleksii.kurochko@xxxxxxxxx/T/#t 

=== x86 ===

*  x86/HVM: emulation (MMIO) improvements (v3)
  -  Jan Beulich
  - https://patchew.org/Xen/729f7896-55b7-4b5b-a7e9-6eb0420e0b14@xxxxxxxx/

=== ARM ===
* Enable early bootup of Armv8-R AArch32 systems
  - Ayan Kumar Halder
  - https://lore.kernel.org/xen-devel/20250414164514.588373-1-ayan.kumar.halder@xxxxxxx/   - https://patchew.org/Xen/20250414164514.588373-1-ayan.kumar.halder@xxxxxxx/ 

=== RISC-V ===

* RISC-V some preinit calls:
  -  Oleksii Kurochko
  - https://lore.kernel.org/xen-devel/4ddde60347edf6740fbc69b5739d099616f5b5ff.1743165791.git.oleksii.kurochko@xxxxxxxxx/ 

* Fixes for UBSAN & GCOV support for RISC-V:
  -  Oleksii Kurochko
  - https://lore.kernel.org/xen-devel/9fbb5e1389b84bed2e95f99e4c383d0215c7a524.1744889185.git.oleksii.kurochko@xxxxxxxxx/ 

Have a good week!

Best regards,
 Oleksii

 

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