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From: Alexander Graf <agraf@suse.de>
To: kvm@vger.kernel.org
Cc: Avi Kivity <avi@redhat.com>, kvm-ppc <kvm-ppc@vger.kernel.org>,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH] Enable 32bit dirty log pointers on 64bit host
Date: Wed, 21 Oct 2009 16:08:29 +0200
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diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cac69c4..54a272f 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -43,6 +43,7 @@
 #include <linux/swap.h>
 #include <linux/bitops.h>
 #include <linux/spinlock.h>
+#include <linux/compat.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
@@ -1542,6 +1543,52 @@ out:
 	return r;
 }
 
+#ifdef CONFIG_COMPAT
+struct compat_kvm_dirty_log {
+	__u32 slot;
+	__u32 padding1;
+	union {
+		compat_uptr_t dirty_bitmap; /* one bit per page */
+		__u64 padding2;
+	};
+};
+
+static long kvm_vm_compat_ioctl(struct file *filp,
+			   unsigned int ioctl, unsigned long arg)
+{
+	struct kvm *kvm = filp->private_data;
+	int r;
+
+	if (kvm->mm != current->mm)
+		return -EIO;
+	switch (ioctl) {
+	case KVM_GET_DIRTY_LOG: {
+		struct compat_kvm_dirty_log compat_log;
+		struct kvm_dirty_log log;
+
+		r = -EFAULT;
+		if (copy_from_user(&compat_log, (void __user *)arg,
+				   sizeof(compat_log)))
+			goto out;
+		log.slot	 = compat_log.slot;
+		log.padding1	 = compat_log.padding1;
+		log.padding2	 = compat_log.padding2;
+		log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
+
+		r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
+		if (r)
+			goto out;
+		break;
+	}
+	default:
+		r = kvm_vm_ioctl(filp, ioctl, arg);
+	}
+
+out:
+	return r;
+}
+#endif
+
 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct page *page[1];
@@ -1576,7 +1623,7 @@ static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
 static struct file_operations kvm_vm_fops = {
 	.release        = kvm_vm_release,
 	.unlocked_ioctl = kvm_vm_ioctl,
-	.compat_ioctl   = kvm_vm_ioctl,
+	.compat_ioctl   = kvm_vm_compat_ioctl,
 	.mmap           = kvm_vm_mmap,
 };