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@xxxxxxxxxxxxxxx> know about it.
>From b9d934f27c91b878c4b2e64299d6e419a4022f8d Mon Sep 17 00:00:00 2001
From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Date: Wed, 29 Apr 2015 17:10:14 -0400
Subject: xen/console: Update console event channel on resume
From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx 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
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