Add the basic infrastructure to active in-kernel irqchip support, inject
interrupts into these models, and maintain IRQ routes.
Routing is optional and depends on the host arch supporting
KVM_CAP_IRQ_ROUTING. When it's not available on x86, we looe the HPET as
we can't route GSI0 to IOAPIC pin 2.
In-kernel irqchip support will once be controlled by the machine
property 'kernel_irqchip', but this is not yet wired up.
Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
---
kvm-all.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++
kvm.h | 8 +++
target-i386/kvm.c | 11 ++++
3 files changed, 168 insertions(+), 0 deletions(-)
diff --git a/kvm-all.c b/kvm-all.c
index 2cc4562..fa9d92d 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -78,6 +78,13 @@ struct KVMState
int pit_in_kernel;
int xsave, xcrs;
int many_ioeventfds;
+ int irqchip_inject_ioctl;
+#ifdef KVM_CAP_IRQ_ROUTING
+ struct kvm_irq_routing *irq_routes;
+ int nr_allocated_irq_routes;
+ uint32_t *used_gsi_bitmap;
+ unsigned int max_gsi;
+#endif
};
KVMState *kvm_state;
@@ -728,6 +735,138 @@ static void kvm_handle_interrupt(CPUState *env, int mask)
}
}
+int kvm_irqchip_set_irq(KVMState *s, int irq, int level)
+{
+ struct kvm_irq_level event;
+ int ret;
+
+ assert(s->irqchip_in_kernel);
+
+ event.level = level;
+ event.irq = irq;
+ ret = kvm_vm_ioctl(s, s->irqchip_inject_ioctl, &event);
+ if (ret < 0) {
+ perror("kvm_set_irqchip_line");
+ abort();
+ }
+
+ return (s->irqchip_inject_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
+}
+
+#ifdef KVM_CAP_IRQ_ROUTING
+static void set_gsi(KVMState *s, unsigned int gsi)
+{
+ assert(gsi < s->max_gsi);
+
+ s->used_gsi_bitmap[gsi / 32] |= 1U << (gsi % 32);
+}
+
+static void kvm_init_irq_routing(KVMState *s)
+{
+ int gsi_count;
+
+ gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING);
+ if (gsi_count > 0) {
+ unsigned int gsi_bits, i;
+
+ /* Round up so we can search ints using ffs */
+ gsi_bits = (gsi_count + 31) / 32;
+ s->used_gsi_bitmap = g_malloc0(gsi_bits / 8);
+ s->max_gsi = gsi_bits;
+
+ /* Mark any over-allocated bits as already in use */
+ for (i = gsi_count; i < gsi_bits; i++) {
+ set_gsi(s, i);
+ }
+ }
+
+ s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
+ s->nr_allocated_irq_routes = 0;
+
+ kvm_arch_init_irq_routing(s);
+}
+
+static void kvm_add_routing_entry(KVMState *s,
+ struct kvm_irq_routing_entry *entry)
+{
+ struct kvm_irq_routing_entry *new;
+ int n, size;
+
+ if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
+ n = s->nr_allocated_irq_routes * 2;
+ if (n < 64) {
+ n = 64;
+ }
+ size = sizeof(struct kvm_irq_routing);
+ size += n * sizeof(*new);
+ s->irq_routes = g_realloc(s->irq_routes, size);
+ s->nr_allocated_irq_routes = n;
+ }
+ n = s->irq_routes->nr++;
+ new = &s->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;
+
+ set_gsi(s, entry->gsi);
+}
+
+void kvm_irqchip_add_route(KVMState *s, int irq, int irqchip, int pin)
+{
+ struct kvm_irq_routing_entry e;
+
+ e.gsi = irq;
+ e.type = KVM_IRQ_ROUTING_IRQCHIP;
+ e.flags = 0;
+ e.u.irqchip.irqchip = irqchip;
+ e.u.irqchip.pin = pin;
+ kvm_add_routing_entry(s, &e);
+}
+
+int kvm_irqchip_commit_routes(KVMState *s)
+{
+ s->irq_routes->flags = 0;
+ return kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
+}
+
+#else /* !KVM_CAP_IRQ_ROUTING */
+
+static void kvm_init_irq_routing(KVMState *s)
+{
+}
+#endif /* !KVM_CAP_IRQ_ROUTING */
+
+static int kvm_irqchip_create(KVMState *s)
+{
+ QemuOptsList *list = qemu_find_opts("machine");
+ int ret;
+
+ if (QTAILQ_EMPTY(&list->head) ||
+ !qemu_opt_get_bool(QTAILQ_FIRST(&list->head),
+ "kernel_irqchip", false) ||
+ !kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
+ return 0;
+ }
+
+ ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
+ if (ret < 0) {
+ fprintf(stderr, "Create kernel irqchip failed\n");
+ return ret;
+ }
+
+ s->irqchip_inject_ioctl = KVM_IRQ_LINE;
+ if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
+ s->irqchip_inject_ioctl = KVM_IRQ_LINE_STATUS;
+ }
+ s->irqchip_in_kernel = 1;
+
+ kvm_init_irq_routing(s);
+
+ return 0;
+}
+
int kvm_init(void)
{
static const char upgrade_note[] =
@@ -823,6 +962,11 @@ int kvm_init(void)
goto err;
}
+ ret = kvm_irqchip_create(s);
+ if (ret < 0) {
+ goto err;
+ }
+
kvm_state = s;
memory_listener_register(&kvm_memory_listener);
@@ -1158,6 +1302,11 @@ int kvm_has_many_ioeventfds(void)
return kvm_state->many_ioeventfds;
}
+int kvm_has_gsi_routing(void)
+{
+ return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
+}
+
void kvm_setup_guest_memory(void *start, size_t size)
{
if (!kvm_has_sync_mmu()) {
diff --git a/kvm.h b/kvm.h
index c1de81a..dd2d4f0 100644
--- a/kvm.h
+++ b/kvm.h
@@ -51,6 +51,7 @@ int kvm_has_debugregs(void);
int kvm_has_xsave(void);
int kvm_has_xcrs(void);
int kvm_has_many_ioeventfds(void);
+int kvm_has_gsi_routing(void);
#ifdef NEED_CPU_H
int kvm_init_vcpu(CPUState *env);
@@ -124,6 +125,13 @@ void kvm_arch_reset_vcpu(CPUState *env);
int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void *addr);
int kvm_arch_on_sigbus(int code, void *addr);
+void kvm_arch_init_irq_routing(KVMState *s);
+
+int kvm_irqchip_set_irq(KVMState *s, int irq, int level);
+
+void kvm_irqchip_add_route(KVMState *s, int gsi, int irqchip, int pin);
+int kvm_irqchip_commit_routes(KVMState *s);
+
struct kvm_guest_debug;
struct kvm_debug_exit_arch;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 1f56492..f6f4189 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -1939,3 +1939,14 @@ bool kvm_arch_stop_on_emulation_error(CPUState *env)
return !(env->cr[0] & CR0_PE_MASK) ||
((env->segs[R_CS].selector & 3) != 3);
}
+
+void kvm_arch_init_irq_routing(KVMState *s)
+{
+ if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
+ /* If kernel can't do irq routing, interrupt source
+ * override 0->2 cannot be set up as required by HPET.
+ * So we have to disable it.
+ */
+ no_hpet = 1;
+ }
+}
--
1.7.3.4
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