Collect iova range information if VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE
capability is supported.
This allows to propagate the information though the IOMMU MR
set_iova_ranges() callback so that virtual IOMMUs
get aware of those aperture constraints. This is only done if
the info is available and the number of iova ranges is greater than
0.
A new vfio_get_info_iova_range helper is introduced matching
the coding style of existing vfio_get_info_dma_avail. The
boolean returned value isn't used though. Code is aligned
between both.
Signed-off-by: Eric Auger <eric.au...@redhat.com>
---
v2 -> v3:
- Turn nr_iovas into a int initialized to -1
- memory_region_iommu_set_iova_ranges only is called if nr_iovas > 0
- vfio_get_info_iova_range returns a bool to match
vfio_get_info_dma_avail. Uniformize both code by using !hdr in
the check
- rebase on top of vfio-next
---
include/hw/vfio/vfio-common.h | 2 ++
hw/vfio/common.c | 9 +++++++
hw/vfio/container.c | 44 ++++++++++++++++++++++++++++++++---
3 files changed, 52 insertions(+), 3 deletions(-)
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 7780b9073a..848ff47960 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -99,6 +99,8 @@ typedef struct VFIOContainer {
QLIST_HEAD(, VFIORamDiscardListener) vrdl_list;
QLIST_ENTRY(VFIOContainer) next;
QLIST_HEAD(, VFIODevice) device_list;
+ int nr_iovas;
+ GList *iova_ranges;
} VFIOContainer;
typedef struct VFIOGuestIOMMU {
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 5ff5acf1d8..9d804152ba 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -699,6 +699,15 @@ static void vfio_listener_region_add(MemoryListener
*listener,
goto fail;
}
+ if (container->nr_iovas > 0) {
+ ret = memory_region_iommu_set_iova_ranges(giommu->iommu_mr,
+ container->iova_ranges, &err);
+ if (ret) {
+ g_free(giommu);
+ goto fail;
+ }
+ }
+
ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
&err);
if (ret) {
diff --git a/hw/vfio/container.c b/hw/vfio/container.c
index adc467210f..5122ff6d92 100644
--- a/hw/vfio/container.c
+++ b/hw/vfio/container.c
@@ -382,7 +382,7 @@ bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info
*info,
/* 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) {
+ if (!hdr) {
return false;
}
@@ -394,6 +394,33 @@ bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info
*info,
return true;
}
+static bool vfio_get_info_iova_range(struct vfio_iommu_type1_info *info,
+ VFIOContainer *container)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_cap_iova_range *cap;
+
+ hdr = vfio_get_iommu_type1_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE);
+ if (!hdr) {
+ return false;
+ }
+
+ cap = (void *)hdr;
+
+ container->nr_iovas = cap->nr_iovas;
+ for (int i = 0; i < cap->nr_iovas; i++) {
+ Range *range = g_new(Range, 1);
+
+ range_set_bounds(range, cap->iova_ranges[i].start,
+ cap->iova_ranges[i].end);
+ container->iova_ranges =
+ range_list_insert(container->iova_ranges, range);
+ }
+
+ return true;
+}
+
static void vfio_kvm_device_add_group(VFIOGroup *group)
{
Error *err = NULL;
@@ -535,6 +562,12 @@ static void vfio_get_iommu_info_migration(VFIOContainer
*container,
}
}
+static void vfio_free_container(VFIOContainer *container)
+{
+ g_list_free_full(container->iova_ranges, g_free);
+ g_free(container);
+}
+
static int vfio_connect_container(VFIOGroup *group, AddressSpace *as,
Error **errp)
{
@@ -616,6 +649,8 @@ static int vfio_connect_container(VFIOGroup *group,
AddressSpace *as,
container->error = NULL;
container->dirty_pages_supported = false;
container->dma_max_mappings = 0;
+ container->nr_iovas = -1;
+ container->iova_ranges = NULL;
QLIST_INIT(&container->giommu_list);
QLIST_INIT(&container->hostwin_list);
QLIST_INIT(&container->vrdl_list);
@@ -652,6 +687,9 @@ static int vfio_connect_container(VFIOGroup *group,
AddressSpace *as,
if (!vfio_get_info_dma_avail(info, &container->dma_max_mappings)) {
container->dma_max_mappings = 65535;
}
+
+ vfio_get_info_iova_range(info, container);
+
vfio_get_iommu_info_migration(container, info);
g_free(info);
@@ -765,7 +803,7 @@ enable_discards_exit:
vfio_ram_block_discard_disable(container, false);
free_container_exit:
- g_free(container);
+ vfio_free_container(container);
close_fd_exit:
close(fd);
@@ -819,7 +857,7 @@ static void vfio_disconnect_container(VFIOGroup *group)
trace_vfio_disconnect_container(container->fd);
close(container->fd);
- g_free(container);
+ vfio_free_container(container);
vfio_put_address_space(space);
}
--
2.41.0
