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kvm: Introduce kvm_irqchip_update_msi_route 

This service allows to update an MSI route without releasing/reacquiring
the associated VIRQ. Will be used by PCI device assignment, later on
likely also by virtio/vhost and VFIO.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-08-27 08:28:38 +02:00 committed by Avi Kivity
parent b131c74a0e
commit cc57407e96
2 changed files with 43 additions and 0 deletions
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42
kvm-all.c
View File

@ -963,6 +963,30 @@ static void kvm_add_routing_entry(KVMState *s,
kvm_irqchip_commit_routes(s);
}
static int kvm_update_routing_entry(KVMState *s,
struct kvm_irq_routing_entry *new_entry)
{
struct kvm_irq_routing_entry *entry;
int n;
for (n = 0; n < s->irq_routes->nr; n++) {
entry = &s->irq_routes->entries[n];
if (entry->gsi != new_entry->gsi) {
continue;
}
entry->type = new_entry->type;
entry->flags = new_entry->flags;
entry->u = new_entry->u;
kvm_irqchip_commit_routes(s);
return 0;
}
return -ESRCH;
}
void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
{
struct kvm_irq_routing_entry e;
@ -1125,6 +1149,24 @@ int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
return virq;
}
int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
{
struct kvm_irq_routing_entry kroute;
if (!kvm_irqchip_in_kernel()) {
return -ENOSYS;
}
kroute.gsi = virq;
kroute.type = KVM_IRQ_ROUTING_MSI;
kroute.flags = 0;
kroute.u.msi.address_lo = (uint32_t)msg.address;
kroute.u.msi.address_hi = msg.address >> 32;
kroute.u.msi.data = msg.data;
return kvm_update_routing_entry(s, &kroute);
}
static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
{
struct kvm_irqfd irqfd = {

1
kvm.h
View File

@ -270,6 +270,7 @@ int kvm_set_ioeventfd_mmio(int fd, uint32_t adr, uint32_t val, bool assign,
int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg);
int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg);
void kvm_irqchip_release_virq(KVMState *s, int virq);
int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n, int virq);