kvm_vm_ioctl_get_dirty_log() is now implemented as arch dependent function.
But now that we know what is actually arch dependent, we can split this into
arch dependent part and arch independent part easily.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
---
 arch/ia64/kvm/kvm-ia64.c  |   14 ++------------
 arch/powerpc/kvm/book3s.c |   14 ++------------
 arch/powerpc/kvm/booke.c  |    2 +-
 arch/s390/kvm/kvm-s390.c  |    4 ++--
 arch/x86/kvm/x86.c        |   14 ++------------
 include/linux/kvm_host.h  |    4 ++--
 virt/kvm/kvm_main.c       |   24 ++++++++++++++++++++++++
 7 files changed, 35 insertions(+), 41 deletions(-)

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index da0c133..86b6b1d 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1815,24 +1815,15 @@ static void kvm_ia64_sync_dirty_log(struct kvm *kvm,
 	spin_unlock(&kvm->arch.dirty_log_lock);
 }
 
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-		struct kvm_dirty_log *log)
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				    struct kvm_dirty_log *log)
 {
 	int r, i;
 	unsigned long n;
 	struct kvm_memory_slot *memslot;
 	unsigned long is_dirty = 0;
 
-	mutex_lock(&kvm->slots_lock);
-
-	r = -EINVAL;
-	if (log->slot >= KVM_MEMORY_SLOTS)
-		goto out;
-
 	memslot = &kvm->memslots->memslots[log->slot];
-	r = -ENOENT;
-	if (!memslot->dirty_bitmap)
-		goto out;
 
 	kvm_ia64_sync_dirty_log(kvm, memslot);
 
@@ -1855,7 +1846,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 	}
 	r = 0;
 out:
-	mutex_unlock(&kvm->slots_lock);
 	return r;
 }
 
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bea6f7c..884d4a5 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -1179,8 +1179,8 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 /*
  * Get (and clear) the dirty memory log for a memory slot.
  */
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-				      struct kvm_dirty_log *log)
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				    struct kvm_dirty_log *log)
 {
 	struct kvm_memory_slot *memslot;
 	struct kvm_vcpu *vcpu;
@@ -1189,16 +1189,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 	int r, i;
 	unsigned long n;
 
-	mutex_lock(&kvm->slots_lock);
-
-	r = -EINVAL;
-	if (log->slot >= KVM_MEMORY_SLOTS)
-		goto out;
-
 	memslot = &kvm->memslots->memslots[log->slot];
-	r = -ENOENT;
-	if (!memslot->dirty_bitmap)
-		goto out;
 
 	n = kvm_dirty_bitmap_bytes(memslot);
 
@@ -1226,7 +1217,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 
 	r = 0;
 out:
-	mutex_unlock(&kvm->slots_lock);
 	return r;
 }
 
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 8d4e35f..376b586 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -565,7 +565,7 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 	return r;
 }
 
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 {
 	return -ENOTSUPP;
 }
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 47acdb1..159aec2 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -134,8 +134,8 @@ int kvm_dev_ioctl_check_extension(long ext)
 /*
  * Get (and clear) the dirty memory log for a memory slot.
  */
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-			       struct kvm_dirty_log *log)
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				    struct kvm_dirty_log *log)
 {
 	return 0;
 }
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e18e68f..ce4c603 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2861,24 +2861,15 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm,
 /*
  * Get (and clear) the dirty memory log for a memory slot.
  */
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-				      struct kvm_dirty_log *log)
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				    struct kvm_dirty_log *log)
 {
 	int r, i;
 	struct kvm_memory_slot *memslot;
 	unsigned long n;
 	unsigned long is_dirty = 0;
 
-	mutex_lock(&kvm->slots_lock);
-
-	r = -EINVAL;
-	if (log->slot >= KVM_MEMORY_SLOTS)
-		goto out;
-
 	memslot = &kvm->memslots->memslots[log->slot];
-	r = -ENOENT;
-	if (!memslot->dirty_bitmap)
-		goto out;
 
 	n = kvm_dirty_bitmap_bytes(memslot);
 
@@ -2929,7 +2920,6 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
 
 	r = 0;
 out:
-	mutex_unlock(&kvm->slots_lock);
 	return r;
 }
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b51e6b2..9289d1a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -336,8 +336,8 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 
 int kvm_dev_ioctl_check_extension(long ext);
 
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-				struct kvm_dirty_log *log);
+int kvm_arch_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				    struct kvm_dirty_log *log);
 
 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 				   struct
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8859049..bf3d273 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -773,6 +773,30 @@ int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 	return kvm_set_memory_region(kvm, mem, user_alloc);
 }
 
+static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
+				      struct kvm_dirty_log *log)
+{
+	struct kvm_memory_slot *memslot;
+	int r;
+
+	mutex_lock(&kvm->slots_lock);
+
+	r = -EINVAL;
+	if (log->slot >= KVM_MEMORY_SLOTS)
+		goto out;
+
+	memslot = &kvm->memslots->memslots[log->slot];
+	r = -ENOENT;
+	if (!memslot->dirty_bitmap)
+		goto out;
+
+	r = kvm_arch_vm_ioctl_get_dirty_log(kvm, log);
+
+out:
+	mutex_unlock(&kvm->slots_lock);
+	return r;
+}
+
 void kvm_disable_largepages(void)
 {
 	largepages_enabled = false;
-- 
1.7.0.4

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