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xen/18547-pirq-vector-mapping-fix.patch

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# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1222349872 -3600
# Node ID e1507b441be45d6d1cac25a196b53beff857a083
# Parent ddf62f69611127319e3c756b9fbc82e29f59ef36
x86: Clean up and fix 18539:31f09a5e24cf8
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
--- a/xen/arch/ia64/xen/irq.c
+++ b/xen/arch/ia64/xen/irq.c
@@ -459,12 +459,12 @@ int pirq_guest_bind(struct vcpu *v, int
return rc;
}
-int pirq_guest_unbind(struct domain *d, int irq)
+void pirq_guest_unbind(struct domain *d, int irq)
{
irq_desc_t *desc = &irq_desc[irq];
irq_guest_action_t *action;
unsigned long flags;
- int i, rc = 0;
+ int i;
spin_lock_irqsave(&desc->lock, flags);
@@ -472,11 +472,7 @@ int pirq_guest_unbind(struct domain *d,
for ( i = 0; (i < action->nr_guests) && (action->guest[i] != d); i++ )
continue;
- if ( i == action->nr_guests )
- {
- rc = -EINVAL;
- goto out;
- }
+ BUG_ON(i == action->nr_guests);
memmove(&action->guest[i], &action->guest[i+1], IRQ_MAX_GUESTS-i-1);
action->nr_guests--;
@@ -496,9 +492,7 @@ int pirq_guest_unbind(struct domain *d,
desc->handler->shutdown(irq);
}
- out:
spin_unlock_irqrestore(&desc->lock, flags);
- return rc;
}
void
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -508,14 +508,14 @@ int pirq_guest_bind(struct vcpu *v, int
unsigned int vector;
irq_desc_t *desc;
irq_guest_action_t *action;
- unsigned long flags;
int rc = 0;
cpumask_t cpumask = CPU_MASK_NONE;
WARN_ON(!spin_is_locked(&v->domain->evtchn_lock));
+ BUG_ON(!local_irq_is_enabled());
retry:
- desc = domain_spin_lock_irq_desc(v->domain, irq, &flags);
+ desc = domain_spin_lock_irq_desc(v->domain, irq, NULL);
if ( desc == NULL )
return -EINVAL;
@@ -575,7 +575,7 @@ int pirq_guest_bind(struct vcpu *v, int
*/
ASSERT(action->ack_type == ACKTYPE_EOI);
ASSERT(desc->status & IRQ_DISABLED);
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irq(&desc->lock);
cpu_relax();
goto retry;
}
@@ -591,43 +591,25 @@ int pirq_guest_bind(struct vcpu *v, int
action->guest[action->nr_guests++] = v->domain;
out:
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irq(&desc->lock);
return rc;
}
-int pirq_guest_unbind(struct domain *d, int irq)
+static void __pirq_guest_unbind(struct domain *d, int irq, irq_desc_t *desc)
{
- int vector;
- irq_desc_t *desc;
+ unsigned int vector;
irq_guest_action_t *action;
cpumask_t cpu_eoi_map;
- unsigned long flags;
- int i, rc = 0;
+ int i;
- WARN_ON(!spin_is_locked(&d->evtchn_lock));
-
- desc = domain_spin_lock_irq_desc(d, irq, &flags);
- if ( unlikely(desc == NULL) )
- {
- if ( !msi_enable || (vector = -domain_irq_to_vector(d, irq)) == 0 )
- return -EINVAL;
- BUG_ON(vector <= 0);
- desc = &irq_desc[vector];
- spin_lock_irqsave(&desc->lock, flags);
- d->arch.pirq_vector[irq] = d->arch.vector_pirq[vector] = 0;
- goto out;
- }
+ BUG_ON(!(desc->status & IRQ_GUEST));
action = (irq_guest_action_t *)desc->action;
vector = desc - irq_desc;
for ( i = 0; (i < action->nr_guests) && (action->guest[i] != d); i++ )
continue;
- if ( i == action->nr_guests )
- {
- rc = -EINVAL;
- goto out;
- }
+ BUG_ON(i == action->nr_guests);
memmove(&action->guest[i], &action->guest[i+1], IRQ_MAX_GUESTS-i-1);
action->nr_guests--;
@@ -645,9 +627,9 @@ int pirq_guest_unbind(struct domain *d,
(action->nr_guests != 0) )
{
cpu_eoi_map = action->cpu_eoi_map;
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irq(&desc->lock);
on_selected_cpus(cpu_eoi_map, set_eoi_ready, desc, 1, 0);
- spin_lock_irqsave(&desc->lock, flags);
+ spin_lock_irq(&desc->lock);
}
break;
}
@@ -659,7 +641,7 @@ int pirq_guest_unbind(struct domain *d,
BUG_ON(test_bit(irq, d->pirq_mask));
if ( action->nr_guests != 0 )
- goto out;
+ return;
BUG_ON(action->in_flight != 0);
@@ -679,9 +661,9 @@ int pirq_guest_unbind(struct domain *d,
if ( !cpus_empty(cpu_eoi_map) )
{
BUG_ON(action->ack_type != ACKTYPE_EOI);
- spin_unlock_irqrestore(&desc->lock, flags);
+ spin_unlock_irq(&desc->lock);
on_selected_cpus(cpu_eoi_map, set_eoi_ready, desc, 1, 1);
- spin_lock_irqsave(&desc->lock, flags);
+ spin_lock_irq(&desc->lock);
}
BUG_ON(!cpus_empty(action->cpu_eoi_map));
@@ -692,10 +674,63 @@ int pirq_guest_unbind(struct domain *d,
desc->status &= ~IRQ_INPROGRESS;
kill_timer(&irq_guest_eoi_timer[vector]);
desc->handler->shutdown(vector);
+}
+
+void pirq_guest_unbind(struct domain *d, int irq)
+{
+ irq_desc_t *desc;
+ int vector;
+
+ WARN_ON(!spin_is_locked(&d->evtchn_lock));
+
+ BUG_ON(!local_irq_is_enabled());
+ desc = domain_spin_lock_irq_desc(d, irq, NULL);
+
+ if ( desc == NULL )
+ {
+ if ( !msi_enable )
+ return;
+ vector = -domain_irq_to_vector(d, irq);
+ BUG_ON(vector <= 0);
+ desc = &irq_desc[vector];
+ spin_lock_irq(&desc->lock);
+ d->arch.pirq_vector[irq] = d->arch.vector_pirq[vector] = 0;
+ }
+ else
+ {
+ __pirq_guest_unbind(d, irq, desc);
+ }
+
+ spin_unlock_irq(&desc->lock);
+}
+
+int pirq_guest_force_unbind(struct domain *d, int irq)
+{
+ irq_desc_t *desc;
+ irq_guest_action_t *action;
+ int i, bound = 0;
+
+ WARN_ON(!spin_is_locked(&d->evtchn_lock));
+
+ BUG_ON(!local_irq_is_enabled());
+ desc = domain_spin_lock_irq_desc(d, irq, NULL);
+ BUG_ON(desc == NULL);
+
+ if ( !(desc->status & IRQ_GUEST) )
+ goto out;
+
+ action = (irq_guest_action_t *)desc->action;
+ for ( i = 0; (i < action->nr_guests) && (action->guest[i] != d); i++ )
+ continue;
+ if ( i == action->nr_guests )
+ goto out;
+
+ bound = 1;
+ __pirq_guest_unbind(d, irq, desc);
out:
- spin_unlock_irqrestore(&desc->lock, flags);
- return rc;
+ spin_unlock_irq(&desc->lock);
+ return bound;
}
extern void dump_ioapic_irq_info(void);
--- a/xen/arch/x86/physdev.c
+++ b/xen/arch/x86/physdev.c
@@ -147,7 +147,7 @@ static int unmap_domain_pirq(struct doma
{
unsigned long flags;
irq_desc_t *desc;
- bool_t forced_unbind = (pirq_guest_unbind(d, pirq) == 0);
+ bool_t forced_unbind = pirq_guest_force_unbind(d, pirq);
if ( forced_unbind )
dprintk(XENLOG_G_WARNING, "dom%d: forcing unbind of pirq %d\n",
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -376,8 +376,7 @@ static long __evtchn_close(struct domain
break;
case ECS_PIRQ:
- if ( pirq_guest_unbind(d1, chn1->u.pirq) != 0 )
- BUG();
+ pirq_guest_unbind(d1, chn1->u.pirq);
d1->pirq_to_evtchn[chn1->u.pirq] = 0;
break;
--- a/xen/include/asm-x86/irq.h
+++ b/xen/include/asm-x86/irq.h
@@ -55,4 +55,6 @@ int pirq_shared(struct domain *d , int i
#define domain_irq_to_vector(d, irq) (msi_enable ? (d)->arch.pirq_vector[irq] : irq_to_vector(irq))
#define domain_vector_to_irq(d, vec) (msi_enable ? (d)->arch.vector_pirq[vec] : vector_to_irq(vec))
+int pirq_guest_force_unbind(struct domain *d, int irq);
+
#endif /* _ASM_HW_IRQ_H */
--- a/xen/include/xen/irq.h
+++ b/xen/include/xen/irq.h
@@ -77,7 +77,7 @@ struct vcpu;
extern int pirq_guest_eoi(struct domain *d, int irq);
extern int pirq_guest_unmask(struct domain *d);
extern int pirq_guest_bind(struct vcpu *v, int irq, int will_share);
-extern int pirq_guest_unbind(struct domain *d, int irq);
+extern void pirq_guest_unbind(struct domain *d, int irq);
static inline void set_native_irq_info(int irq, cpumask_t mask)
{
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