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authorOlaf Hering <olaf@aepfle.de>2011-08-25 20:30:48 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-09-01 19:48:54 +0400
commit62cc5fc7b2e0218144e162afb8191db9b924b5e6 (patch)
tree8d8d301157536fe6d65c8ca3303995a81a5a7d3b /drivers/xen
parentc4c303c7c5679b4b368e12f41124aee29c325b76 (diff)
downloadlinux-62cc5fc7b2e0218144e162afb8191db9b924b5e6.tar.xz
xen/pv-on-hvm kexec: rebind virqs to existing eventchannel ports
During a kexec boot some virqs such as timer and debugirq were already registered by the old kernel. The hypervisor will return -EEXISTS from the new EVTCHNOP_bind_virq request and the BUG in bind_virq_to_irq() triggers. Catch the -EEXISTS error and loop through all possible ports to find what port belongs to the virq/cpu combo. Signed-off-by: Olaf Hering <olaf@aepfle.de> [v2: - use NR_EVENT_CHANNELS instead of private MAX_EVTCHNS] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/events.c37
1 files changed, 32 insertions, 5 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 30df85d8fca8..31493e906bbd 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -877,11 +877,32 @@ static int bind_interdomain_evtchn_to_irq(unsigned int remote_domain,
return err ? : bind_evtchn_to_irq(bind_interdomain.local_port);
}
+static int find_virq(unsigned int virq, unsigned int cpu)
+{
+ struct evtchn_status status;
+ int port, rc = -ENOENT;
+
+ memset(&status, 0, sizeof(status));
+ for (port = 0; port <= NR_EVENT_CHANNELS; port++) {
+ status.dom = DOMID_SELF;
+ status.port = port;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status);
+ if (rc < 0)
+ continue;
+ if (status.status != EVTCHNSTAT_virq)
+ continue;
+ if (status.u.virq == virq && status.vcpu == cpu) {
+ rc = port;
+ break;
+ }
+ }
+ return rc;
+}
int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
{
struct evtchn_bind_virq bind_virq;
- int evtchn, irq;
+ int evtchn, irq, ret;
spin_lock(&irq_mapping_update_lock);
@@ -897,10 +918,16 @@ int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
bind_virq.virq = virq;
bind_virq.vcpu = cpu;
- if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
- &bind_virq) != 0)
- BUG();
- evtchn = bind_virq.port;
+ ret = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
+ &bind_virq);
+ if (ret == 0)
+ evtchn = bind_virq.port;
+ else {
+ if (ret == -EEXIST)
+ ret = find_virq(virq, cpu);
+ BUG_ON(ret < 0);
+ evtchn = ret;
+ }
xen_irq_info_virq_init(cpu, irq, evtchn, virq);