linux-kernel - [PATCH] xen/privcmd: make option visible in Kconfig

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Message-Id: <20211116143323.18866-1-jgross@suse.com>
Date:   Tue, 16 Nov 2021 15:33:23 +0100
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     linux@...ssschuh.net, Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: [PATCH] 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.

Based-on-patch-by: Thomas Weißschuh <linux@...ssschuh.net>
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 drivers/xen/Kconfig | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index a1b11c62da9e..a2e91d3ca372 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -259,9 +259,14 @@ 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 user land 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"
-- 
2.26.2