xen/privcmd: make option visible in Kconfig

This configuration option provides a misc device as an API to userspace.
Make this API usable without having to select the module as a transitive
dependency.

This also fixes an issue where localyesconfig would select
CONFIG_XEN_PRIVCMD=m because it was not visible and defaulted to
building as module.

[boris: clarified help message per Jan's suggestion]

Based-on-patch-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20211116143323.18866-1-jgross@suse.com
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index a1b11c62da9e360dc79f151eb49bf3f2a1757ba3..33e941e40082d98562ba2e60c25d5f9e095550fd 100644 (file)
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -259,9 +259,15 @@ config XEN_SCSI_BACKEND
          if guests need generic access to SCSI devices.
 
 config XEN_PRIVCMD
-       tristate
+       tristate "Xen hypercall passthrough driver"
        depends on XEN
        default m
+       help
+         The hypercall passthrough driver allows privileged user programs to
+         perform Xen hypercalls. This driver is normally required for systems
+         running as Dom0 to perform privileged operations, but in some
+         disaggregated Xen setups this driver might be needed for other
+         domains, too.
 
 config XEN_ACPI_PROCESSOR
        tristate "Xen ACPI processor"