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xen/events: fix binding user event channels to cpus

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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: c48f64ab47 ("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>
This commit is contained in:
Juergen Gross 2019-06-21 20:47:03 +02:00
parent 9637d51734
commit bce5963bcb
3 changed files with 13 additions and 4 deletions
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12
drivers/xen/events/events_base.c
View File

@ -1294,7 +1294,7 @@ 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;
@ -1328,7 +1328,6 @@ 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)
@ -1342,6 +1341,15 @@ 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);

2
drivers/xen/evtchn.c
View File

@ -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);
}

3
include/xen/events.h
View File

@ -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)
{