KVM: x86: merge kvm_arch_set_irq with kvm_set_msi_inatomic

We do not want to do too much work in atomic context, in particular
not walking all the VCPUs of the virtual machine.  So we want
to distinguish the architecture-specific injection function for irqfd
from kvm_set_msi.  Since it's still empty, reuse the newly added
kvm_arch_set_irq and rename it to kvm_arch_set_irq_inatomic.

Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index e29fd2640709..46dbc0a7dfc1 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -171,7 +171,7 @@ irqfd_deactivate(struct kvm_kernel_irqfd *irqfd)
         queue_work(irqfd_cleanup_wq, &irqfd->shutdown);
 }
 
-int __attribute__((weak)) kvm_arch_set_irq(
+int __attribute__((weak)) kvm_arch_set_irq_inatomic(
                                 struct kvm_kernel_irq_routing_entry *irq,
                                 struct kvm *kvm, int irq_source_id,
                                 int level,
@@ -201,12 +201,9 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
                         irq = irqfd->irq_entry;
                 } while (read_seqcount_retry(&irqfd->irq_entry_sc, seq));
                 /* An event has been signaled, inject an interrupt */
-                if (irq.type == KVM_IRQ_ROUTING_MSI)
-                        kvm_set_msi(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1,
-                                        false);
-                else if (kvm_arch_set_irq(&irq, kvm,
-                                          KVM_USERSPACE_IRQ_SOURCE_ID, 1,
-                                          false) == -EWOULDBLOCK)
+                if (kvm_arch_set_irq_inatomic(&irq, kvm,
+                                              KVM_USERSPACE_IRQ_SOURCE_ID, 1,
+                                              false) == -EWOULDBLOCK)
                         schedule_work(&irqfd->inject);
                 srcu_read_unlock(&kvm->irq_srcu, idx);
         }