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| author |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2015-04-29 17:10:13 -0400 |
|---|---|---|
| committer |   David Vrabel <david.vrabel@citrix.com> | 2015-05-05 18:27:13 +0100 |
| commit | 16f1cf3ba7303228372d3756677bf7d10e79cf9f (patch) | |
| tree | 399b3a03d53ee01b3ad986f1d26b65dfa8fd6792 /drivers/xen | |
| parent | xen/events: Clear cpu_evtchn_mask before resuming (diff) | |
| download | linux-dev-16f1cf3ba7303228372d3756677bf7d10e79cf9f.tar.xz linux-dev-16f1cf3ba7303228372d3756677bf7d10e79cf9f.zip | |
xen/xenbus: Update xenbus event channel on resume
After a resume the hypervisor/tools may change xenbus 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>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xenbus/xenbus_probe.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index 564b31584860..5390a674b5e3 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -57,6 +57,7 @@ #include <xen/xen.h> #include <xen/xenbus.h> #include <xen/events.h> +#include <xen/xen-ops.h> #include <xen/page.h> #include <xen/hvm.h> @@ -735,6 +736,30 @@ static int __init xenstored_local_init(void) return err; } +static int xenbus_resume_cb(struct notifier_block *nb, + unsigned long action, void *data) +{ + int err = 0; + + if (xen_hvm_domain()) { + uint64_t v; + + err = hvm_get_parameter(HVM_PARAM_STORE_EVTCHN, &v); + if (!err && v) + xen_store_evtchn = v; + else + pr_warn("Cannot update xenstore event channel: %d\n", + err); + } else + xen_store_evtchn = xen_start_info->store_evtchn; + + return err; +} + +static struct notifier_block xenbus_resume_nb = { + .notifier_call = xenbus_resume_cb, +}; + static int __init xenbus_init(void) { int err = 0; @@ -793,6 +818,10 @@ static int __init xenbus_init(void) goto out_error; } + if ((xen_store_domain_type != XS_LOCAL) && + (xen_store_domain_type != XS_UNKNOWN)) + xen_resume_notifier_register(&xenbus_resume_nb); + #ifdef CONFIG_XEN_COMPAT_XENFS /* * Create xenfs mountpoint in /proc for compatibility with |