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-rw-r--r--drivers/iommu/intel-iommu.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 40dfbc0..e3276ee 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -50,6 +50,7 @@
#define CONTEXT_SIZE VTD_PAGE_SIZE
#define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
+#define IS_USB_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB)
#define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
#define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
@@ -2561,6 +2562,10 @@ static bool device_has_rmrr(struct device *dev)
* In both cases we assume that PCI USB devices with RMRRs have them largely
* for historical reasons and that the RMRR space is not actively used post
* boot. This exclusion may change if vendors begin to abuse it.
+ *
+ * The same exception is made for graphics devices, with the requirement that
+ * any use of the RMRR regions will be torn down before assigning the device
+ * to a guest.
*/
static bool device_is_rmrr_locked(struct device *dev)
{
@@ -2570,7 +2575,7 @@ static bool device_is_rmrr_locked(struct device *dev)
if (dev_is_pci(dev)) {
struct pci_dev *pdev = to_pci_dev(dev);
- if ((pdev->class >> 8) == PCI_CLASS_SERIAL_USB)
+ if (IS_USB_DEVICE(pdev) || IS_GFX_DEVICE(pdev))
return false;
}
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