[Xen-devel] [PATCH v2 3/4] xen/console: Update console event channel on resume

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

After a resume the hypervisor/tools may change console event
channel number. We should re-query it.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Reviewed-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/tty/hvc/hvc_xen.c |   18 +++++++++++++++++-
 1 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index f1e5742..5bab1c6 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -299,11 +299,27 @@ static int xen_initial_domain_console_init(void)
        return 0;
 }
 
+static void xen_console_update_evtchn(struct xencons_info *info)
+{
+       if (xen_hvm_domain()) {
+               uint64_t v;
+               int err;
+
+               err = hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN, &v);
+               if (!err && v)
+                       info->evtchn = v;
+       } else
+               info->evtchn = xen_start_info->console.domU.evtchn;
+}
+
 void xen_console_resume(void)
 {
        struct xencons_info *info = vtermno_to_xencons(HVC_COOKIE);
-       if (info != NULL && info->irq)
+       if (info != NULL && info->irq) {
+               if (!xen_initial_domain())
+                       xen_console_update_evtchn(info);
                rebind_evtchn_irq(info->evtchn, info->irq);
+       }
 }
 
 static void xencons_disconnect_backend(struct xencons_info *info)
-- 
1.7.1


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