From 3e4a4563e55dc8281f8269ff630574a76d08053c Mon Sep 17 00:00:00 2001
From: Michael S. Tsirkin <mst@redhat.com>
Date: Wed, 3 Mar 2010 19:58:03 -0300
Subject: [PATCH 03/17] kvm: add API to set ioeventfd

RH-Author: Michael S. Tsirkin <mst@redhat.com>
Message-id: <10351875e20080f65daf75bb68c78eee8eefb0f4.1267644824.git.mst@redhat.com>
Patchwork-id: 7478
O-Subject: [PATCHv3 03/17] kvm: add API to set ioeventfd
Bugzilla: 562958
RH-Acked-by: Juan Quintela <quintela@redhat.com>
RH-Acked-by: Amit Shah <amit.shah@redhat.com>
RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>

This adds API to set ioeventfd to kvm,
as well as stubs for non-eventfd case,
making it possible for users to use this API
without ifdefs.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 kvm-all.c |   22 ++++++++++++++++++++++
 kvm.h     |   16 ++++++++++++++++
 2 files changed, 38 insertions(+), 0 deletions(-)

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
---
 kvm-all.c |   22 ++++++++++++++++++++++
 kvm.h     |   16 ++++++++++++++++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 0423fff..c344bd1 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1102,4 +1102,26 @@ void kvm_remove_all_breakpoints(CPUState *current_env)
 }
 #endif /* !KVM_CAP_SET_GUEST_DEBUG */
 
+#ifdef KVM_IOEVENTFD
+int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
+{
+    struct kvm_ioeventfd kick = {
+        .datamatch = val,
+        .addr = addr,
+        .len = 2,
+        .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO,
+        .fd = fd,
+    };
+    int r;
+    if (!kvm_enabled())
+        return -ENOSYS;
+    if (!assign)
+        kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
+    r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
+    if (r < 0)
+        return r;
+    return 0;
+}
+#endif
+
 #include "qemu-kvm.c"
diff --git a/kvm.h b/kvm.h
index e2a945b..6ac54fe 100644
--- a/kvm.h
+++ b/kvm.h
@@ -14,6 +14,8 @@
 #ifndef QEMU_KVM_H
 #define QEMU_KVM_H
 
+#include <stdbool.h>
+#include <errno.h>
 #include "config.h"
 #include "qemu-queue.h"
 #include "qemu-kvm.h"
@@ -21,6 +23,10 @@
 #ifdef KVM_UPSTREAM
 
 #ifdef CONFIG_KVM
+#include <linux/kvm.h>
+#endif
+
+#ifdef CONFIG_KVM
 extern int kvm_allowed;
 
 #define kvm_enabled() (kvm_allowed)
@@ -146,4 +152,14 @@ static inline void cpu_synchronize_state(CPUState *env)
 
 #endif
 
+#if defined(KVM_IOEVENTFD) && defined(CONFIG_KVM)
+int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
+#else
+static inline
+int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign)
+{
+    return -ENOSYS;
+}
+#endif
+
 #endif
-- 
1.6.3.rc4.29.g8146