linux-kernel - [PATCH AUTOSEL 4.4 1/9] xen/privcmd: make option visible in Kconfig

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Date:   Tue, 30 Nov 2021 09:53:54 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Jan Beulich <jbeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Sasha Levin <sashal@...nel.org>, xen-devel@...ts.xenproject.org
Subject: [PATCH AUTOSEL 4.4 1/9] xen/privcmd: make option visible in Kconfig

From: Juergen Gross <jgross@...e.com>

[ Upstream commit 897919ad8b42eb8222553838ab82414a924694aa ]

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@...ssschuh.net>
Signed-off-by: Juergen Gross <jgross@...e.com>
Link: https://lore.kernel.org/r/20211116143323.18866-1-jgross@suse.com
Reviewed-by: Jan Beulich <jbeulich@...e.com>
Reviewed-by: Thomas Weißschuh <linux@...ssschuh.net>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/xen/Kconfig | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 3a14948269b1e..59f862350a6ec 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -199,9 +199,15 @@ 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_STUB
 	bool "Xen stub drivers"
-- 
2.33.0