Patch "xen/console: Update console event channel on resume" has been added to the 3.14-stable tree

Patch "xen/console: Update console event channel on resume" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    xen/console: Update console event channel on resume

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xen-console-update-console-event-channel-on-resume.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From b9d934f27c91b878c4b2e64299d6e419a4022f8d Mon Sep 17 00:00:00 2001
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: Wed, 29 Apr 2015 17:10:14 -0400
Subject: xen/console: Update console event channel on resume

From: Boris Ostrovsky <boris.ostrovsky@oracle.com>

commit b9d934f27c91b878c4b2e64299d6e419a4022f8d upstream.

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

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/tty/hvc/hvc_xen.c |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -299,11 +299,27 @@ static int xen_initial_domain_console_in
 	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)


Patches currently in stable-queue which might be from boris.ostrovsky@oracle.com are

queue-3.14/xen-console-update-console-event-channel-on-resume.patch
queue-3.14/xen-events-set-irq_info-evtchn-before-binding-the-channel-to-cpu-in-__startup_pirq.patch
queue-3.14/xen-events-clear-cpu_evtchn_mask-before-resuming.patch