That is to say, don't support a domain assigns a device to itself or detachs
a device from itself.
Signed-off-by: Chao Gao <chao....@intel.com>
---
v9:
- Newly added
xen/drivers/passthrough/pci.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 338d6b4..a80d59e 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -1603,6 +1603,13 @@ int iommu_do_pci_domctl(
break;
case XEN_DOMCTL_assign_device:
+ /* Don't support self-(de)assignment of devices */
+ if ( d == current->domain )
+ {
+ ret = -EINVAL;
+ break;
+ }
+
ret = -ENODEV;
if ( domctl->u.assign_device.dev != XEN_DOMCTL_DEV_PCI )
break;
@@ -1643,6 +1650,13 @@ int iommu_do_pci_domctl(
break;
case XEN_DOMCTL_deassign_device:
+ /* Don't support self-(de)assignment of devices */
+ if ( d == current->domain )
+ {
+ ret = -EINVAL;
+ break;
+ }
+
ret = -ENODEV;
if ( domctl->u.assign_device.dev != XEN_DOMCTL_DEV_PCI )
break;
--
1.8.3.1
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