File vfio-Find-DMA-available-capability.patch of Package qemu.20153

From: Matthew Rosato <mjrosato@linux.ibm.com>
Date: Mon, 26 Oct 2020 11:34:33 -0400
Subject: vfio: Find DMA available capability

Git-commit: 7486a62845b1e12011dd99973e4739f69d57cd38
References: bsc#1179719

The underlying host may be limiting the number of outstanding DMA
requests for type 1 IOMMU.  Add helper functions to check for the
DMA available capability and retrieve the current number of DMA
mappings allowed.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[aw: vfio_get_info_dma_avail moved inside CONFIG_LINUX]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Liang Yan <lyan@suse.com>
---
 hw/vfio/common.c              | 31 +++++++++++++++++++++++++++++++
 include/hw/vfio/vfio-common.h |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 77d62d2dcdf67516c3e5b42e7def..23efdfadebd0db3c8b7bf03e9b07 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -850,6 +850,37 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
     return vfio_get_cap((void *)info, info->cap_offset, id);
 }
 
+static struct vfio_info_cap_header *
+vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
+{
+    if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
+        return NULL;
+    }
+
+    return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+                             unsigned int *avail)
+{
+    struct vfio_info_cap_header *hdr;
+    struct vfio_iommu_type1_info_dma_avail *cap;
+
+    /* If the capability cannot be found, assume no DMA limiting */
+    hdr = vfio_get_iommu_type1_info_cap(info,
+                                        VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
+    if (hdr == NULL) {
+        return false;
+    }
+
+    if (avail != NULL) {
+        cap = (void *) hdr;
+        *avail = cap->avail;
+    }
+
+    return true;
+}
+
 static int vfio_setup_region_sparse_mmaps(VFIORegion *region,
                                           struct vfio_region_info *info)
 {
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index fd564209ac710afb15325a452b8f..aa6cbe4a99890a229aa7a1e0c39c 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -191,6 +191,8 @@ int vfio_get_dev_region_info(VFIODevice *vbasedev, uint32_t type,
 bool vfio_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_type);
 struct vfio_info_cap_header *
 vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id);
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+                             unsigned int *avail);
 #endif
 extern const MemoryListener vfio_prereg_listener;