From: "Liu, Yi L" <yi.l.liu@xxxxxxxxxxxxxxx>
This patch adds VFIO_IOMMU_TLB_INVALIDATE to propagate IOMMU TLB
invalidate request from guest to host.
In the case of SVM virtualization on VT-d, host IOMMU driver has
no knowledge of caching structure updates unless the guest
invalidation activities are passed down to the host. So a new
IOCTL is needed to propagate the guest cache invalidation through
VFIO.
Signed-off-by: Liu, Yi L <yi.l.liu@xxxxxxxxxxxxxxx>
---
include/uapi/linux/vfio.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 6b97987..50c51f8 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -564,6 +564,15 @@ struct vfio_device_svm {
#define VFIO_IOMMU_SVM_BIND_TASK _IO(VFIO_TYPE, VFIO_BASE + 22)
+/* For IOMMU TLB Invalidation Propagation */
+struct vfio_iommu_tlb_invalidate {
+ __u32 argsz;
+ __u32 length;
+ __u8 data[];
+};
+
+#define VFIO_IOMMU_TLB_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 23)
+
/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
/*
--
1.9.1
