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[PATCH] xen/console: Handle true dom0less case when switching serial input
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Tue, 14 Mar 2023 15:27:49 +0100
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- Cc: Michal Orzel <michal.orzel@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, "Jan Beulich" <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, "Stefano Stabellini" <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Tue, 14 Mar 2023 14:28:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
At the moment, we direct serial input to hardware domain by default.
This does not make any sense when running in true dom0less mode, since
such domain does not exist. As a result, users wishing to write to
an emulated UART of a domU are always forced to execute CTRL-AAA first.
The same issue is when rotating among serial inputs, where we always
have to go through hardware domain case.
Modify switch_serial_input() so that, if there is no hardware domain
(i.e. true dom0less case) and console_rx is 1 (i.e. input to hwdom),
we skip it and move to the next serial input.
Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
xen/drivers/char/console.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index e8468c121ad0..3bbab35dc460 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -491,6 +491,14 @@ static void switch_serial_input(void)
else
{
console_rx++;
+
+ /*
+ * Skip switching serial input to hardware domain if it does not exist
+ * (i.e. true dom0less mode).
+ */
+ if ( !hardware_domain && (console_rx == 1) )
+ console_rx++;
+
printk("*** Serial input to DOM%d", console_rx - 1);
}
--
2.25.1
|
