[PATCH 07/16] kvm: user interface for MSI type irq routing

Sheng Yang
2009-03-12T13:37:05Z

libkvm/libkvm.c | 98 ++++++++++++++++++++++++++++++++++++++++++++-----------
libkvm/libkvm.h | 22 ++++++++++++
2 files changed, 101 insertions(+), 19 deletions(-)

diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
index 80a0481..e9bae23 100644
--- a/libkvm/libkvm.c
+++ b/libkvm/libkvm.c
@@ -1265,11 +1265,12 @@ int kvm_clear_gsi_routes(kvm_context_t kvm)
#endif
}

-int kvm_add_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
+int kvm_add_routing_entry(kvm_context_t kvm,
+ struct kvm_irq_routing_entry* entry)
{
#ifdef KVM_CAP_IRQ_ROUTING
struct kvm_irq_routing *z;
- struct kvm_irq_routing_entry *e;
+ struct kvm_irq_routing_entry *new;
int n, size;

if (kvm->irq_routes->nr == kvm->nr_allocated_irq_routes) {
@@ -1277,7 +1278,7 @@ int kvm_add_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
if (n < 64)
n = 64;
size = sizeof(struct kvm_irq_routing);
- size += n * sizeof(*e);
+ size += n * sizeof(*new);
z = realloc(kvm->irq_routes, size);
if (!z)
return -ENOMEM;
@@ -1285,34 +1286,77 @@ int kvm_add_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
kvm->irq_routes = z;
}
n = kvm->irq_routes->nr++;
- e = &kvm->irq_routes->entries[n];
- memset(e, 0, sizeof(*e));
- e->gsi = gsi;
- e->type = KVM_IRQ_ROUTING_IRQCHIP;
- e->flags = 0;
- e->u.irqchip.irqchip = irqchip;
- e->u.irqchip.pin = pin;
+ new = &kvm->irq_routes->entries[n];
+ memset(new, 0, sizeof(*new));
+ new->gsi = entry->gsi;
+ new->type = entry->type;
+ new->flags = entry->flags;
+ new->u = entry->u;
return 0;
#else
return -ENOSYS;
#endif
}

-int kvm_del_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
+int kvm_add_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
+{
+#ifdef KVM_CAP_IRQ_ROUTING
+ struct kvm_irq_routing_entry e;
+
+ e.gsi = gsi;
+ e.type = KVM_IRQ_ROUTING_IRQCHIP;
+ e.flags = 0;
+ e.u.irqchip.irqchip = irqchip;
+ e.u.irqchip.pin = pin;
+ return kvm_add_routing_entry(kvm, &e);
+#else
+ return -ENOSYS;
+#endif
+}
+
+int kvm_del_routing_entry(kvm_context_t kvm,
+ struct kvm_irq_routing_entry* entry)
{
#ifdef KVM_CAP_IRQ_ROUTING
struct kvm_irq_routing_entry *e, *p;
- int i;
+ int i, found = 0;

for (i = 0; i < kvm->irq_routes->nr; ++i) {
e = &kvm->irq_routes->entries[i];
- if (e->type == KVM_IRQ_ROUTING_IRQCHIP
- && e->gsi == gsi
- && e->u.irqchip.irqchip == irqchip
- && e->u.irqchip.pin == pin) {
- p = &kvm->irq_routes->entries[--kvm->irq_routes->nr];
- *e = *p;
- return 0;
+ if (e->type == entry->type
+ && e->gsi == entry->gsi) {
+ switch (e->type)
+ {
+ case KVM_IRQ_ROUTING_IRQCHIP: {
+ if (e->u.irqchip.irqchip ==
+ entry->u.irqchip.irqchip
+ && e->u.irqchip.pin ==
+ entry->u.irqchip.pin) {
+ p = &kvm->irq_routes->
+ entries[--kvm->irq_routes->nr];
+ *e = *p;
+ found = 1;
+ }
+ break;
+ }
+ case KVM_IRQ_ROUTING_MSI: {
+ if (e->u.msi.address_lo ==
+ entry->u.msi.address_lo
+ && e->u.msi.address_hi ==
+ entry->u.msi.address_hi
+ && e->u.msi.data == entry->u.msi.data) {
+ p = &kvm->irq_routes->
+ entries[--kvm->irq_routes->nr];
+ *e = *p;
+ found = 1;
+ }
+ break;
+ }
+ default:
+ break;
+ }
+ if (found)
+ return 0;
}
}
return -ESRCH;
@@ -1321,6 +1365,22 @@ int kvm_del_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
#endif
}

+int kvm_del_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin)
+{
+#ifdef KVM_CAP_IRQ_ROUTING
+ struct kvm_irq_routing_entry e;
+
+ e.gsi = gsi;
+ e.type = KVM_IRQ_ROUTING_IRQCHIP;
+ e.flags = 0;
+ e.u.irqchip.irqchip = irqchip;
+ e.u.irqchip.pin = pin;
+ return kvm_del_routing_entry(kvm, &e);
+#else
+ return -ENOSYS;
+#endif
+}
+
int kvm_commit_irq_routes(kvm_context_t kvm)
{
#ifdef KVM_CAP_IRQ_ROUTING
diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
index 3e5efe0..51f4d08 100644
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -816,6 +816,28 @@ int kvm_add_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin);
int kvm_del_irq_route(kvm_context_t kvm, int gsi, int irqchip, int pin);

/*!
+ * \brief Adds a routing entry to the temporary irq routing table
+ *
+ * Adds a filled routing entry to the temporary irq routing table. Nothing is
+ * committed to the running VM.
+ *
+ * \param kvm Pointer to the current kvm_context
+ */
+int kvm_add_routing_entry(kvm_context_t kvm,
+ struct kvm_irq_routing_entry* entry);
+
+/*!
+ * \brief Removes a routing from the temporary irq routing table
+ *
+ * Remove a routing to the temporary irq routing table. Nothing is
+ * committed to the running VM.
+ *
+ * \param kvm Pointer to the current kvm_context
+ */
+int kvm_del_routing_entry(kvm_context_t kvm,
+ struct kvm_irq_routing_entry* entry);
+
+/*!
* \brief Commit the temporary irq routing table
*
* Commit the temporary irq routing table to the running VM.
--
1.5.4.5