Re: [PATCH v5 00/24] Disable domctl-op via CONFIG_MGMT_HYPERCALLS

[Jan Beulich <jbeulich@xxxxxxxx>]

On 12.12.2025 05:01, Penny Zheng wrote:
> It can be beneficial for some dom0less systems to further reduce Xen footprint
> via disabling some hypercalls handling code, which may not to be used &
> required in such systems.
> We are introducing a new single Kconfig CONFIG_MGMT_HYPERCALLS to manage
> such hypercalls.
> 
> We are trying to disable hypercalls in the following aspects:
> - sysctl
> - domctl
> - hvm
> - physdev
> - platform
> This patch serie is only focusing on domctl-op. Different aspects will be
> covered in different patch serie.
> 
> Features, like VM event, or paging log-dirty support, which fully rely on
> domctl-op, will be wrapped with CONFIG_MGMT_HYPERCALLS, to reduce Xen
> footprint as much as possible.
> 
> It is derived from Stefano Stabellini's commit "xen: introduce kconfig options
> to disable hypercalls"(
> https://lore.kernel.org/xen-devel/20241219092917.3006174-1-Sergiy_Kibrik@xxxxxxxx)
> ---
> This patch serie is based on "[PATCH v3 0/7] consolidate vm event subsystem"
> ---
> The following commits are prerequisite, and could be committed independently:
> - xen/xsm: remove redundant flask_iomem_mapping()
> - xen/x86: library-fy cpuid-releated functions
> - xen/arm: move dt_find_node_by_gpath() to passthrough/device_tree.c
> - xen/sysctl: replace CONFIG_SYSCTL with CONFIG_MGMT_HYPERCALLS
> ---
> Penny Zheng (24):
>   xen/xsm: remove redundant flask_iomem_mapping()
>   xen/x86: library-fy cpuid-releated functions
>   xen/arm: move dt_find_node_by_gpath() to passthrough/device_tree.c
>   xen/sysctl: replace CONFIG_SYSCTL with CONFIG_MGMT_HYPERCALLS

>From past discussion I would have concluded that this is what wants doing 
>first.
Is there a reason this isn't the first patch (and hence it's unclear whether it
could go in as soon as you managed to chase the - apparently - one missing ack)?

As to missing ack-s - may I once again point out that it is on you to chase 
them?
(Daniel, first and foremost to you: Hint, hint.)

Jan