[Qemu-devel] [PATCH-RFC 02/13] kvm: add API to set ioeventfd

["Michael S. Tsirkin" <mst@redhat.com>]

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 kvm-all.c |   24 ++++++++++++++++++++++++
 kvm.h     |    3 +++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index a312654..aa00119 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1113,3 +1113,27 @@ void kvm_remove_all_breakpoints(CPUState *current_env)
 {
 }
 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
+
+#ifdef KVM_IOEVENTFD
+int kvm_set_ioeventfd(uint16_t addr, uint16_t data, int fd, bool assigned)
+{
+    struct kvm_ioeventfd kick = {
+        .datamatch = data,
+        .addr = addr,
+        .len = 2,
+        .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
+        .fd = fd,
+    };
+    if (!assigned)
+        kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
+    int r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
+    if (r < 0)
+        return r;
+    return 0;
+}
+#else
+int kvm_set_ioeventfd(uint16_t data, uint16_t addr, int fd, bool assigned)
+{
+    return -ENOSYS;
+}
+#endif
diff --git a/kvm.h b/kvm.h
index 672d511..2d723b8 100644
--- a/kvm.h
+++ b/kvm.h
@@ -14,6 +14,7 @@
 #ifndef QEMU_KVM_H
 #define QEMU_KVM_H
 
+#include <stdbool.h>
 #include "config.h"
 #include "qemu-queue.h"
 
@@ -131,4 +132,6 @@ static inline void cpu_synchronize_state(CPUState *env)
     }
 }
 
+int kvm_set_ioeventfd(uint16_t addr, uint16_t data, int fd, bool assigned);
+
 #endif
-- 
1.6.6.rc1.43.gf55cc