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xen/console: Update console event channel on resume 

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Boris Ostrovsky 2015-04-29 17:10:14 -04:00 committed by David Vrabel
parent 16f1cf3ba7
commit b9d934f27c
1 changed files with 17 additions and 1 deletions
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18
drivers/tty/hvc/hvc_xen.c
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@ -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)