linux-kernel - [PATCH] s390/kvm: avoid hypfs error message

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Message-Id: <20220607123314.10255-1-jgross@suse.com>
Date:   Tue,  7 Jun 2022 14:33:14 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>
Subject: [PATCH] s390/kvm: avoid hypfs error message

When booting under KVM the following error messages are issued:

hypfs.7f5705: The hardware system does not support hypfs
hypfs.7a79f0: Initialization of hypfs failed with rc=-61

While being documented, they can easily be avoided by bailing out of
hypfs_init() early in case of running as a KVM guest.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/s390/hypfs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 5c97f48cea91..bdf078f3c641 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -464,6 +464,9 @@ static int __init hypfs_init(void)
 {
 	int rc;
 
+	if (MACHINE_IS_KVM)
+		return -ENODATA;
+
 	hypfs_dbfs_init();
 
 	if (hypfs_diag_init()) {
-- 
2.35.3