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-rw-r--r--include/sysemu/kvm.h11
-rw-r--r--kvm-all.c4
-rw-r--r--kvm-stub.c1
3 files changed, 16 insertions, 0 deletions
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index e79e92c50e..c4556ad59e 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -43,6 +43,7 @@ extern bool kvm_allowed;
extern bool kvm_kernel_irqchip;
extern bool kvm_async_interrupts_allowed;
extern bool kvm_halt_in_kernel_allowed;
+extern bool kvm_eventfds_allowed;
extern bool kvm_irqfds_allowed;
extern bool kvm_msi_via_irqfd_allowed;
extern bool kvm_gsi_routing_allowed;
@@ -83,6 +84,15 @@ extern bool kvm_readonly_mem_allowed;
#define kvm_halt_in_kernel() (kvm_halt_in_kernel_allowed)
/**
+ * kvm_eventfds_enabled:
+ *
+ * Returns: true if we can use eventfds to receive notifications
+ * from a KVM CPU (ie the kernel supports eventds and we are running
+ * with a configuration where it is meaningful to use them).
+ */
+#define kvm_eventfds_enabled() (kvm_eventfds_allowed)
+
+/**
* kvm_irqfds_enabled:
*
* Returns: true if we can use irqfds to inject interrupts into
@@ -128,6 +138,7 @@ extern bool kvm_readonly_mem_allowed;
#define kvm_irqchip_in_kernel() (false)
#define kvm_async_interrupts_enabled() (false)
#define kvm_halt_in_kernel() (false)
+#define kvm_eventfds_enabled() (false)
#define kvm_irqfds_enabled() (false)
#define kvm_msi_via_irqfd_enabled() (false)
#define kvm_gsi_routing_allowed() (false)
diff --git a/kvm-all.c b/kvm-all.c
index 4e19eff0ef..92f56d8a31 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -113,6 +113,7 @@ KVMState *kvm_state;
bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed;
bool kvm_halt_in_kernel_allowed;
+bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed;
@@ -1541,6 +1542,9 @@ int kvm_init(MachineClass *mc)
(kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
#endif
+ kvm_eventfds_allowed =
+ (kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
+
ret = kvm_arch_init(s);
if (ret < 0) {
goto err;
diff --git a/kvm-stub.c b/kvm-stub.c
index ac33d8666d..8e7737caa9 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -22,6 +22,7 @@
KVMState *kvm_state;
bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed;
+bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed;