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.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
arch/x86/kvm/irq_comm.c | 14 ++++++++------
include/linux/kvm_host.h | 7 +++----
virt/kvm/eventfd.c | 11 ++++-------
3 files changed, 15 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 8f4499c7ffc1..26d830c1b7af 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -124,12 +124,16 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
}
-static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
- struct kvm *kvm)
+int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
{
struct kvm_lapic_irq irq;
int r;
+ if (unlikely(e->type != KVM_IRQ_ROUTING_MSI))
+ return -EWOULDBLOCK;
+
kvm_set_msi_irq(e, &irq);
if (kvm_irq_delivery_to_apic_fast(kvm, NULL, &irq, &r, NULL))
@@ -165,10 +169,8 @@ int kvm_set_irq_inatomic(struct kvm *kvm, int
irq_source_id, u32 irq, int level)
idx = srcu_read_lock(&kvm->irq_srcu);
if (kvm_irq_map_gsi(kvm, entries, irq) > 0) {
e = &entries[0];
- if (likely(e->type == KVM_IRQ_ROUTING_MSI))
- ret = kvm_set_msi_inatomic(e, kvm);
- else
- ret = -EWOULDBLOCK;
+ ret = kvm_arch_set_irq_inatomic(e, kvm, irq_source_id,
+ irq, level);
}
srcu_read_unlock(&kvm->irq_srcu, idx);
return ret;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index eba9caebc9c1..42fb9e089fc9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -828,10 +828,9 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32
irq, int level,
int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int
level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm
*kvm,
int irq_source_id, int level, bool line_status);
-
-int kvm_arch_set_irq(struct kvm_kernel_irq_routing_entry *irq, struct kvm *kvm,
- int irq_source_id, int level, bool line_status);
-
+int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id,
+ int level, bool line_status);
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
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);
}
--
1.8.3.1
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