Re: Xen 4.21 Development Update [June-July]

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

On 8/6/25 8:05 AM, Jan Beulich wrote:

> On 05.08.2025 20:19, Oleksii Kurochko wrote:
> > * Full list of items : *
> >
> > = Projects =
> >
> > == Hypervisor ==
> >
> > * [4.21] xen/console: cleanup console input switch logic (v5)
> >    - Denis Mukhin
> >    - 
> > https://lore.kernel.org/xen-devel/20250530231841.73386-1-dmukhin@xxxxxxxx/
> >
> > * [4.21] xen: introduce CONFIG_SYSCTL (v4 -> v8)
> >    -  Penny Zheng
> >    - 
> > https://lore.kernel.org/xen-devel/20250711043158.2566880-1-Penny.Zheng@xxxxxxx/
> >
> > * [4.21] 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/
> >
> > * [4.21] automation: Refresh the remaining Debian containers (v2)
> >    -  Javi Merino
> >    - 
> > https://lore.kernel.org/xen-devel/cover.1730743077.git.javi.merino@xxxxxxxxx/T/#m5d9acb7cf5db3c2be3d6527de14b69b07812314e
> >
> > * [4.21] 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.
> >
> > * [next-rel(s)] Physical address hypercall ABI ("HVMv2")
> >    - Teddy Astie
> >    - 
> > https://lore.kernel.org/xen-devel/cover.1744981654.git.teddy.astie@xxxxxxxxxx/
> >
> > * [next-rel(s)] xen: Untangle mm.h
> >    -  Andrew Cooper
> >    - 
> > https://lore.kernel.org/xen-devel/20250312174513.4075066-1-andrew.cooper3@xxxxxxxxxx/
> >    - 
> > https://patchew.org/Xen/20250312174513.4075066-1-andrew.cooper3@xxxxxxxxxx/
> >
> > * [next-rel(s)] 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/
> >
> > * [next-rel(s)] Remove the directmap (v5)
> >    -  Alejandro Vallejo
> >    - 
> > https://lore.kernel.org/xen-devel/20250108151822.16030-1-alejandro.vallejo@xxxxxxxxx/
> >    - 
> > https://patchew.org/Xen/20250108151822.16030-1-alejandro.vallejo@xxxxxxxxx/
> >
> > * [next-rel(s)] GRUB: Supporting Secure Boot of xen.gz (v1)
> >    -  Ross Lagerwall
> >    - 
> > https://patchew.org/Xen/20240313150748.791236-1-ross.lagerwall@xxxxxxxxxx/
> >
> > * [next-rel(s)] Introduce xenbindgen to autogen hypercall structs (v1)
> >    -  Alejandro Vallejo
> >    - 
> > https://patchew.org/Xen/20241115115200.2824-1-alejandro.vallejo@xxxxxxxxx/
> >
> > * [next-rel(s)] Introduce NS8250 UART emulator (v2)
> >    -  Denis Mukhin
> >    - 
> > https://patchew.org/Xen/20241205-vuart-ns8250-v1-0-e9aa923127eb@xxxxxxxx/
> >
> > * [next-rel(s)] xen: framework for UART emulators
> >    - Denis Mukhin
> >    - 
> > https://lore.kernel.org/xen-devel/20250624035443.344099-1-dmukhin@xxxxxxxx/
> >
> > === x86 ===
> > * [4.21] x86/asm: cleanups after toolchain baseline upgrade (v1 -> v2)
> >    - Denis Mukhin
> >    - 
> > https://lore.kernel.org/xen-devel/20250403182250.3329498-1-dmukhin@xxxxxxxx/
> >    - https://patchew.org/Xen/20250403182250.3329498-1-dmukhin@xxxxxxxx/
> >
> > * [4.21?] x86/efi: Fix booting when NX is disabled (v1 -> v2)
> >    - Andrew Cooper
> >    - 
> > https://patchew.org/Xen/20240722101838.3946983-1-andrew.cooper3@xxxxxxxxxx/
> >    - 
> > https://lore.kernel.org/xen-devel/20240722101838.3946983-1-andrew.cooper3@xxxxxxxxxx/
> >
> > * [4.21?] 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/
> >
> > *  [4.21?] Boot modules for Hyperlaunch (v9)
> >    -  Daniel P. Smith
> >    - 
> > https://lore.kernel.org/xen-devel/20241115131204.32135-1-dpsmith@xxxxxxxxxxxxxxxxxxxx/
> >    - 
> > https://patchew.org/Xen/20241115131204.32135-1-dpsmith@xxxxxxxxxxxxxxxxxxxx/
> >
> > *  [4.21?] Address Space Isolation FPU preparations (v2->v3)
> >    -  Alejandro Vallejo
> >    - 
> > https://patchew.org/Xen/20250110132823.24348-1-alejandro.vallejo@xxxxxxxxx/
> >
> > * [next-rel(s)] Hyperlaunch domain builder
> >    - Daniel P. Smith
> >    - 
> > https://lore.kernel.org/xen-devel/20250515131744.3843-1-dpsmith@xxxxxxxxxxxxxxxxxxxx/
> >
> > * [next-rel(s)] Confidential computing and AMD SEV support
> >    - Teddy Astie
> >    - https://patchew.org/Xen/cover.1747312394.git.teddy.astie@xxxxxxxxxx/
> >    - 
> > https://lore.kernel.org/xen-devel/cover.1747312394.git.teddy.astie@xxxxxxxxxx/
> >
> > * [next-rel(s)] amd-cppc CPU Performance Scaling Driver (v5 -> v6)
> >    - Penny Zheng
> >    - 
> > https://lore.kernel.org/xen-devel/20250711035106.2540522-1-Penny.Zheng@xxxxxxx/
> >
> > * [next-rel(s)] x86: Trenchboot Secure Launch DRTM (Xen) (v1 -> v3)
> >    - Sergii Dmytruk
> >    - https://patchew.org/Xen/cover.1745172094.git.sergii.dmytruk@xxxxxxxxx/
> >    - 
> > https://lore.kernel.org/xen-devel/cover.1748611041.git.sergii.dmytruk@xxxxxxxxx/
> >
> > * [next-rel(s)] x86/EFI: prevent write-execute sections
> >    - Roger Pau Monne <roger.pau@xxxxxxxxxx>
> >    - 
> > https://lore.kernel.org/xen-devel/20250401130840.72119-1-roger.pau@xxxxxxxxxx/
> >
> > * [next-rel(s)] 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/
> >
> > *  [next-rel(s)] Expose consistent topology to guests (v7)
> >    -  Alejandro Vallejo
> >    - 
> > https://patchew.org/Xen/20241021154600.11745-1-alejandro.vallejo@xxxxxxxxx/
> >
> > *  [next-rel(s)] x86/alternatives: Adjust all insn-relative fields (v2)
> >    -  Andrew Cooper
> >    - 
> > https://lore.kernel.org/xen-devel/20241002152725.1841575-1-andrew.cooper3@xxxxxxxxxx/T/#mac2deaea7e02a343210d61887486433d946ad129
> >
> > *  [next-rel(s)] x86emul: misc additions (v7)
> >    -  Jan Beulich
> >    - https://patchew.org/Xen/3a25cd59-e1cb-4bfc-b868-fb11599d22f5@xxxxxxxx/
> >
> > *  [next-rel(s)] x86: support AVX10 (v3)
> >    -  Jan Beulich
> >    - 
> > https://lore.kernel.org/xen-devel/516b7f9a-048e-409d-8a4e-89aeb8ffacc4@xxxxxxxx/
> >    - https://patchew.org/Xen/516b7f9a-048e-409d-8a4e-89aeb8ffacc4@xxxxxxxx/
> >       
> While it is correct that AVX10 is now to go first, AMX was lost as an item, and
> APX (which I see no reason in posting as long as AVX10 doesn't make any progress)
> was agreed to go after AVX10, before AMX. (KeyLocker was also lost, but that
> happens to be correct, as with Intel abandoning the feature we apparently have no
> plans anymore to make an attempt at supporting it.)
>
> FRED (being worked on by Andrew) is also entirely missing.
>
> Overall: There are very many items on this list, and it seems entirely clear to
> me that not all of them will make it. I think it would be quite helpful to strip
> down the set for 4.21 to some realistic subset. Maybe something to discuss on
> the community call later today?
>     
Good point, lets discuss that tomorrow during the community call.

~ Oleksii