diff options
| author | Juergen Gross | 2019-06-21 20:47:03 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2019-07-26 09:14:25 +0200 |
| commit | 007e5aaf287c0191e54fb034340fe860b1fb96be (patch) | |
| tree | 33cf36a36d1d1a835f3f29a71cbadf0f7feaa4e0 | |
| parent | dm zoned: fix zone state management race (diff) | |
| download | kernel-qcow2-linux-007e5aaf287c0191e54fb034340fe860b1fb96be.tar.gz kernel-qcow2-linux-007e5aaf287c0191e54fb034340fe860b1fb96be.tar.xz kernel-qcow2-linux-007e5aaf287c0191e54fb034340fe860b1fb96be.zip | |
xen/events: fix binding user event channels to cpus
commit bce5963bcb4f9934faa52be323994511d59fd13c upstream.
When binding an interdomain event channel to a vcpu via
IOCTL_EVTCHN_BIND_INTERDOMAIN not only the event channel needs to be
bound, but the affinity of the associated IRQi must be changed, too.
Otherwise the IRQ and the event channel won't be moved to another vcpu
in case the original vcpu they were bound to is going offline.
Cc: <stable@vger.kernel.org> # 4.13
Fixes: c48f64ab472389df ("xen-evtchn: Bind dyn evtchn:qemu-dm interrupt to next online VCPU")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/xen/events/events_base.c | 12 | ||||
| -rw-r--r-- | drivers/xen/evtchn.c | 2 | ||||
| -rw-r--r-- | include/xen/events.h | 3 |
3 files changed, 13 insertions, 4 deletions
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index fe1f16351f94..8d49b91d92cd 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1293,7 +1293,7 @@ void rebind_evtchn_irq(int evtchn, int irq) } /* Rebind an evtchn so that it gets delivered to a specific cpu */ -int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu) +static int xen_rebind_evtchn_to_cpu(int evtchn, unsigned int tcpu) { struct evtchn_bind_vcpu bind_vcpu; int masked; @@ -1327,7 +1327,6 @@ int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu) return 0; } -EXPORT_SYMBOL_GPL(xen_rebind_evtchn_to_cpu); static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, bool force) @@ -1341,6 +1340,15 @@ static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest, return ret; } +/* To be called with desc->lock held. */ +int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu) +{ + struct irq_data *d = irq_desc_get_irq_data(desc); + + return set_affinity_irq(d, cpumask_of(tcpu), false); +} +EXPORT_SYMBOL_GPL(xen_set_affinity_evtchn); + static void enable_dynirq(struct irq_data *data) { int evtchn = evtchn_from_irq(data->irq); diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c index 6d1a5e58968f..47c70b826a6a 100644 --- a/drivers/xen/evtchn.c +++ b/drivers/xen/evtchn.c @@ -447,7 +447,7 @@ static void evtchn_bind_interdom_next_vcpu(int evtchn) this_cpu_write(bind_last_selected_cpu, selected_cpu); /* unmask expects irqs to be disabled */ - xen_rebind_evtchn_to_cpu(evtchn, selected_cpu); + xen_set_affinity_evtchn(desc, selected_cpu); raw_spin_unlock_irqrestore(&desc->lock, flags); } diff --git a/include/xen/events.h b/include/xen/events.h index c3e6bc643a7b..1650d39decae 100644 --- a/include/xen/events.h +++ b/include/xen/events.h @@ -3,6 +3,7 @@ #define _XEN_EVENTS_H #include <linux/interrupt.h> +#include <linux/irq.h> #ifdef CONFIG_PCI_MSI #include <linux/msi.h> #endif @@ -59,7 +60,7 @@ void evtchn_put(unsigned int evtchn); void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector); void rebind_evtchn_irq(int evtchn, int irq); -int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu); +int xen_set_affinity_evtchn(struct irq_desc *desc, unsigned int tcpu); static inline void notify_remote_via_evtchn(int port) { |