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author | Olaf Hering <olaf@aepfle.de> | 2011-08-25 18:30:48 +0200 |
---|---|---|
committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-09-01 11:48:54 -0400 |
commit | 62cc5fc7b2e0218144e162afb8191db9b924b5e6 (patch) | |
tree | 8d8d301157536fe6d65c8ca3303995a81a5a7d3b /drivers/xen/events.c | |
parent | c4c303c7c5679b4b368e12f41124aee29c325b76 (diff) | |
download | linux-62cc5fc7b2e0218144e162afb8191db9b924b5e6.tar.bz2 |
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/events.c')
-rw-r--r-- | drivers/xen/events.c | 37 |
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); |