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Re: [PATCH v4 23/24] xen/domctl: wrap common/domctl.c with CONFIG_MGMT_HYPERCALLS
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 26 Nov 2025 10:25:47 +0100
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- Cc: ray.huang@xxxxxxx, grygorii_strashko@xxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 26 Nov 2025 09:25:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.11.2025 11:58, Penny Zheng wrote:
> --- a/xen/common/Kconfig
> +++ b/xen/common/Kconfig
> @@ -654,11 +654,17 @@ menu "Supported hypercall interfaces"
> config MGMT_HYPERCALLS
> bool "Enable privileged hypercalls for system management"
> depends on !PV_SHIM_EXCLUSIVE
> - def_bool y
Why would the default not be Y anymore?
> help
> - This option shall only be disabled on some dom0less systems, or
> - PV shim on x86, to reduce Xen footprint via managing unnessary
> - hypercalls, like sysctl, etc.
> + Management hypercalls provide the means for dom0 to manage the
> + overall Xen system and other domains, including sysctl, domctl, etc.
> + In a dom0less or pv-shim build, they can be omitted to cut down
> + on the Xen binary's size. However, this comes at the loss of
> + significant runtime functionality.
> + So be cautious to disable it, as admins will face missing a few basic
> + hypercalls like listdomains, getdomaininfo, etc, hence leading to
> + have an impact on device-passthrough and DM.
> +
> + Unless you know what you are doing, you should enable this.
To be in line with what other help texts say, can this be "..., say Y" please?
Jan
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