[RFC v3 04/21] vfio: VFIO_IOMMU_SET_PASID_TABLE

[Eric Auger]

From: "Liu, Yi L" <yi.l....@linux.intel.com>

This patch adds VFIO_IOMMU_SET_PASID_TABLE ioctl which aims at
passing the virtual iommu guest configuration to the VFIO driver
downto to the iommu subsystem.

Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
Signed-off-by: Liu, Yi L <yi.l....@linux.intel.com>
Signed-off-by: Eric Auger <eric.au...@redhat.com>

---
v2 -> v3:
- s/BIND_PASID_TABLE/SET_PASID_TABLE

v1 -> v2:
- s/BIND_GUEST_STAGE/BIND_PASID_TABLE
- remove the struct device arg
---
 drivers/vfio/vfio_iommu_type1.c | 31 +++++++++++++++++++++++++++++++
 include/uapi/linux/vfio.h       |  8 ++++++++
 2 files changed, 39 insertions(+)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 7651cfb14836..d9dd23f64f00 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1644,6 +1644,24 @@ static int vfio_domains_have_iommu_cache(struct 
vfio_iommu *iommu)
        return ret;
 }
 
+static int
+vfio_set_pasid_table(struct vfio_iommu *iommu,
+                     struct vfio_iommu_type1_set_pasid_table *ustruct)
+{
+       struct vfio_domain *d;
+       int ret = 0;
+
+       mutex_lock(&iommu->lock);
+
+       list_for_each_entry(d, &iommu->domain_list, next) {
+               ret = iommu_set_pasid_table(d->domain, &ustruct->config);
+               if (ret)
+                       break;
+       }
+       mutex_unlock(&iommu->lock);
+       return ret;
+}
+
 static long vfio_iommu_type1_ioctl(void *iommu_data,
                                   unsigned int cmd, unsigned long arg)
 {
@@ -1714,6 +1732,19 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
 
                return copy_to_user((void __user *)arg, &unmap, minsz) ?
                        -EFAULT : 0;
+       } else if (cmd == VFIO_IOMMU_SET_PASID_TABLE) {
+               struct vfio_iommu_type1_set_pasid_table ustruct;
+
+               minsz = offsetofend(struct vfio_iommu_type1_set_pasid_table,
+                                   config);
+
+               if (copy_from_user(&ustruct, (void __user *)arg, minsz))
+                       return -EFAULT;
+
+               if (ustruct.argsz < minsz || ustruct.flags)
+                       return -EINVAL;
+
+               return vfio_set_pasid_table(iommu, &ustruct);
        }
 
        return -ENOTTY;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 02bb7ad6e986..0d9f4090c95d 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -14,6 +14,7 @@
 
 #include <linux/types.h>
 #include <linux/ioctl.h>
+#include <linux/iommu.h>
 
 #define VFIO_API_VERSION       0
 
@@ -759,6 +760,13 @@ struct vfio_iommu_type1_dma_unmap {
 #define VFIO_IOMMU_ENABLE      _IO(VFIO_TYPE, VFIO_BASE + 15)
 #define VFIO_IOMMU_DISABLE     _IO(VFIO_TYPE, VFIO_BASE + 16)
 
+struct vfio_iommu_type1_set_pasid_table {
+       __u32   argsz;
+       __u32   flags;
+       struct iommu_pasid_table_config config;
+};
+#define VFIO_IOMMU_SET_PASID_TABLE     _IO(VFIO_TYPE, VFIO_BASE + 22)
+
 /* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
 
 /*
-- 
2.17.2

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