Re: [PATCH v2 1/8] kvm/vfio: Move KVM_DEV_VFIO_GROUP_* ioctls into functions

[Jason Gunthorpe <jgg@xxxxxxxxxx>]

On Wed, Apr 20, 2022 at 04:23:10PM -0300, Jason Gunthorpe wrote:
> To make it easier to read and change in following patches.
> 
> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> ---
>  virt/kvm/vfio.c | 271 ++++++++++++++++++++++++++----------------------
>  1 file changed, 146 insertions(+), 125 deletions(-)
> 
> This is best viewed with 'git show -b'

Zero day hit a warning on 32bit, I'll fold this into v3:

--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -259,9 +259,10 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev,
 }
 #endif
 
-static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
+static int kvm_vfio_set_group(struct kvm_device *dev, long attr,
+			      void __user *arg)
 {
-	int32_t __user *argp = (int32_t __user *)(unsigned long)arg;
+	int32_t __user *argp = arg;
 	int32_t fd;
 
 	switch (attr) {
@@ -277,7 +278,7 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
 
 #ifdef CONFIG_SPAPR_TCE_IOMMU
 	case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE:
-		return kvm_vfio_group_set_spapr_tce(dev, (void __user *)arg);
+		return kvm_vfio_group_set_spapr_tce(dev, arg);
 #endif
 	}
 
@@ -289,7 +290,8 @@ static int kvm_vfio_set_attr(struct kvm_device *dev,
 {
 	switch (attr->group) {
 	case KVM_DEV_VFIO_GROUP:
-		return kvm_vfio_set_group(dev, attr->attr, attr->addr);
+		return kvm_vfio_set_group(dev, attr->attr,
+					  u64_to_user_ptr(attr->addr));
 	}
 
 	return -ENXIO;