Re: [PATCH] s390/kvm: avoid hypfs error message

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Am 20.06.22 um 08:03 schrieb Juergen Gross:
Ping?

On 07.06.22 14:33, Juergen Gross wrote:
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@xxxxxxxx>
---
  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()) {

In case KVM implements hypfs this check would then be wrong.
Question to people on CC/TO.
Would it be an option to still check with KVM but avoid the error message.
So basically changing hypfs_diag_init and fail_dbfs_exit to check
for KVM on error?
Or is this worse?



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