[PATCH v2 5/9] xen/x86: make "earlyprintk=xen" work for HVM/PVH DomU

From: Jan Beulich
Date: Thu Sep 30 2021 - 08:18:54 EST


xenboot_write_console() is dealing with these quite fine so I don't see
why xenboot_console_setup() would return -ENOENT in this case.

Adjust documentation accordingly.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>

--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1266,7 +1266,7 @@
The VGA and EFI output is eventually overwritten by
the real console.

- The xen output can only be used by Xen PV guests.
+ The xen option can only be used in Xen domains.

The sclp output can only be used on s390.

--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -618,10 +618,8 @@ static int __init xenboot_console_setup(
{
static struct xencons_info xenboot;

- if (xen_initial_domain())
+ if (xen_initial_domain() || !xen_pv_domain())
return 0;
- if (!xen_pv_domain())
- return -ENODEV;

return xencons_info_pv_init(&xenboot, 0);
}