From: "Liu, Yi L" <yi.l.liu@xxxxxxxxxxxxxxx>
This patch adds the VFIO_IOMMU_TLB_INVALIDATE ioctl with aims
at propagating stage1 IOMMU TLB invalidations 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>
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
For SMMUv3 invalidations, the device parameter is not needed
---
drivers/vfio/vfio_iommu_type1.c | 23 +++++++++++++++++++++++
include/uapi/linux/vfio.h | 7 +++++++
2 files changed, 30 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 83c7f96..973bb4d 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1687,6 +1687,15 @@ static int bind_guest_stage_fn(struct device *dev, void *data)
return iommu_bind_guest_stage(task->domain, dev, &ustruct->config);
}
+static int do_tlb_inv_fn(struct device *dev, void *data)
+{
+ struct vfio_iommu_type1_tlb_invalidate *ustruct;
+ struct vfio_iommu_task *task = data;
+
+ ustruct = task->payload;
+ return iommu_tlb_invalidate(task->domain, dev, &ustruct->info);
+}
+
static int vfio_iommu_dispatch_task(struct vfio_iommu *iommu, void *data,
int (*fn)(struct device *, void *))
{
@@ -1799,6 +1808,20 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
return vfio_iommu_dispatch_task(iommu, (u8 *)&ustruct,
bind_guest_stage_fn);
+ } else if (cmd == VFIO_IOMMU_TLB_INVALIDATE) {
+ struct vfio_iommu_type1_tlb_invalidate ustruct;
+
+ minsz = offsetofend(struct vfio_iommu_type1_tlb_invalidate,
+ info);
+
+ if (copy_from_user(&ustruct, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (ustruct.argsz < minsz || ustruct.flags)
+ return -EINVAL;
+
+ return vfio_iommu_dispatch_task(iommu, (u8 *)&ustruct,
+ do_tlb_inv_fn);
}
return -ENOTTY;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index a5801ed..b59f9fc 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -673,6 +673,13 @@ struct vfio_iommu_type1_bind_guest_stage {
};
#define VFIO_IOMMU_BIND_GUEST_STAGE _IO(VFIO_TYPE, VFIO_BASE + 22)
+struct vfio_iommu_type1_tlb_invalidate {
+ __u32 argsz;
+ __u32 flags;
+ struct iommu_tlb_invalidate_info info;
+};
+#define VFIO_IOMMU_TLB_INVALIDATE _IO(VFIO_TYPE, VFIO_BASE + 23)
+
/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
/*
--
2.5.5
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