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hyperv: make HvSintRoute reference-counted

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Multiple entities (e.g. VMBus devices) can use the same SINT route.  To
make their lives easier in maintaining SINT route ownership, make it
reference-counted.  Adjust the respective API names accordingly.

Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20180921081836.29230-8-rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Roman Kagan 2018-09-21 11:18:35 +03:00 committed by Paolo Bonzini
parent 09cfb2f635
commit 3d3e6e85c3
3 changed files with 28 additions and 11 deletions
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4
hw/misc/hyperv_testdev.c
View File

@ -52,7 +52,7 @@ static void sint_route_create(HypervTestDev *dev,
sint_route->vp_index = vp_index;
sint_route->sint = sint;
sint_route->sint_route = kvm_hv_sint_route_create(vp_index, sint, NULL, NULL);
sint_route->sint_route = hyperv_sint_route_new(vp_index, sint, NULL, NULL);
assert(sint_route->sint_route);
QLIST_INSERT_HEAD(&dev->sint_routes, sint_route, le);
@ -79,7 +79,7 @@ static void sint_route_destroy(HypervTestDev *dev,
sint_route = sint_route_find(dev, vp_index, sint);
QLIST_REMOVE(sint_route, le);
kvm_hv_sint_route_destroy(sint_route->sint_route);
hyperv_sint_route_unref(sint_route->sint_route);
g_free(sint_route);
}

21
target/i386/hyperv.c
View File

@ -24,6 +24,7 @@ struct HvSintRoute {
EventNotifier sint_ack_notifier;
HvSintAckClb sint_ack_clb;
void *sint_ack_clb_data;
unsigned refcount;
};
uint32_t hyperv_vp_index(X86CPU *cpu)
@ -90,7 +91,7 @@ static void kvm_hv_sint_ack_handler(EventNotifier *notifier)
sint_route->sint_ack_clb(sint_route->sint_ack_clb_data);
}
HvSintRoute *kvm_hv_sint_route_create(uint32_t vp_index, uint32_t sint,
HvSintRoute *hyperv_sint_route_new(uint32_t vp_index, uint32_t sint,
HvSintAckClb sint_ack_clb,
void *sint_ack_clb_data)
{
@ -136,6 +137,7 @@ HvSintRoute *kvm_hv_sint_route_create(uint32_t vp_index, uint32_t sint,
sint_route->sint_ack_clb_data = sint_ack_clb_data;
sint_route->cpu = cpu;
sint_route->sint = sint;
sint_route->refcount = 1;
return sint_route;
@ -154,8 +156,23 @@ err:
return NULL;
}
void kvm_hv_sint_route_destroy(HvSintRoute *sint_route)
void hyperv_sint_route_ref(HvSintRoute *sint_route)
{
sint_route->refcount++;
}
void hyperv_sint_route_unref(HvSintRoute *sint_route)
{
if (!sint_route) {
return;
}
assert(sint_route->refcount > 0);
if (--sint_route->refcount) {
return;
}
kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state,
&sint_route->sint_set_notifier,
sint_route->gsi);

6
target/i386/hyperv.h
View File

@ -22,11 +22,11 @@ typedef void (*HvSintAckClb)(void *data);
int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit);
HvSintRoute *kvm_hv_sint_route_create(uint32_t vp_index, uint32_t sint,
HvSintRoute *hyperv_sint_route_new(uint32_t vp_index, uint32_t sint,
HvSintAckClb sint_ack_clb,
void *sint_ack_clb_data);
void kvm_hv_sint_route_destroy(HvSintRoute *sint_route);
void hyperv_sint_route_ref(HvSintRoute *sint_route);
void hyperv_sint_route_unref(HvSintRoute *sint_route);
int kvm_hv_sint_route_set_sint(HvSintRoute *sint_route);