[Qemu-devel] [RFC PATCH 04/10] vfio: Record host IOMMU's available IO page sizes

[David Gibson]

Depending on the host IOMMU type we determine and record the available page
sizes for IOMMU translation.  We'll need this for other validation in
future patches.

Signed-off-by: David Gibson <address@hidden>
---
 hw/vfio/common.c              | 13 +++++++++++++
 include/hw/vfio/vfio-common.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index c37f1a1..daaac48 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -680,6 +680,7 @@ static int vfio_connect_container(VFIOGroup *group, 
AddressSpace *as)
     if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) ||
         ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
         bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU);
+        struct vfio_iommu_type1_info info;
 
         ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
         if (ret) {
@@ -705,6 +706,15 @@ static int vfio_connect_container(VFIOGroup *group, 
AddressSpace *as)
          */
         container->iommu_data.min_iova = 0;
         container->iommu_data.max_iova = (hwaddr)-1;
+
+        /* Assume just 4K IOVA page size */
+        container->iommu_data.iova_pgsizes = 0x1000;
+        info.argsz = sizeof(info);
+        ret = ioctl(fd, VFIO_IOMMU_GET_INFO, &info);
+        /* Ignore errors */
+        if ((ret == 0) && (info.flags & VFIO_IOMMU_INFO_PGSIZES)) {
+            container->iommu_data.iova_pgsizes = info.iova_pgsizes;
+        }
     } else if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_SPAPR_TCE_IOMMU)) {
         struct vfio_iommu_spapr_tce_info info;
 
@@ -748,6 +758,9 @@ static int vfio_connect_container(VFIOGroup *group, 
AddressSpace *as)
         container->iommu_data.min_iova = info.dma32_window_start;
         container->iommu_data.max_iova = container->iommu_data.min_iova
             + info.dma32_window_size - 1;
+
+        /* Assume just 4K IOVA pages for now */
+        container->iommu_data.iova_pgsizes = 0x1000;
     } else {
         error_report("vfio: No available IOMMU models");
         ret = -EINVAL;
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 88ec213..c09db6d 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -77,6 +77,7 @@ typedef struct VFIOContainer {
          * that in future
          */
         hwaddr min_iova, max_iova;
+        uint64_t iova_pgsizes;
     } iommu_data;
     QLIST_HEAD(, VFIOGuestIOMMU) giommu_list;
     QLIST_HEAD(, VFIOGroup) group_list;
-- 
2.4.3