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Re: [PATCH v5 00/18] xen: introduce CONFIG_SYSCTL
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 26 Jun 2025 17:51:17 +0200
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- Cc: ray.huang@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, George Dunlap <gwd@xxxxxxxxxxxxxx>, Nathan Studer <nathan.studer@xxxxxxxxxxxxxxx>, Stewart Hildebrand <stewart@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxx
- Delivery-date: Thu, 26 Jun 2025 15:51:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.06.2025 08:41, 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. Each hypercall has a separate option to keep
> configuration flexible.
>
> Options to disable hypercalls:
> - sysctl
> - domctl
> - hvm
> - physdev
> - platform
>
> This patch serie is only focusing on introducing CONFIG_SYSCTL. Different
> options will be covered in different patch serie.
>
> Features, like LIVEPATCH, Overlay DTB, which fully rely on sysctl op, will
> be wrapped with CONFIG_SYSCTL, 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)
>
> Penny Zheng (16):
> xen/x86: remove "depends on !PV_SHIM_EXCLUSIVE"
> xen/xsm: wrap around xsm_sysctl with CONFIG_SYSCTL
> xen/sysctl: wrap around XEN_SYSCTL_readconsole
> xen/sysctl: make CONFIG_TRACEBUFFER depend on CONFIG_SYSCTL
> xen/sysctl: wrap around XEN_SYSCTL_sched_id
> xen/sysctl: wrap around XEN_SYSCTL_perfc_op
> xen/sysctl: wrap around XEN_SYSCTL_lockprof_op
> xen/pmstat: introduce CONFIG_PM_OP
> xen/sysctl: introduce CONFIG_PM_STATS
> xen/sysctl: wrap around XEN_SYSCTL_page_offline_op
> xen/sysctl: wrap around XEN_SYSCTL_cpupool_op
> xen/sysctl: wrap around XEN_SYSCTL_scheduler_op
> xen/sysctl: wrap around XEN_SYSCTL_physinfo
> xen/sysctl: make CONFIG_COVERAGE depend on CONFIG_SYSCTL
> xen/sysctl: make CONFIG_LIVEPATCH depend on CONFIG_SYSCTL
> xen/sysctl: wrap around arch-specific arch_do_sysctl
When thinking about whether to commit part of the series, it occurred to me that
to avoid transiently regressing shim (in size), shouldn't the currently 1st
patch
be moved to be 2nd to last, and then be committed together with the last one? In
any event the plan right now is to commit some patches from the beginning of
this
series, but specifically without patch 1. Please shout if you see any problem
with this.
Jan
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