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authorKirti Wankhede <kwankhede@nvidia.com>2020-10-26 15:06:11 +0530
committerAlex Williamson <alex.williamson@redhat.com>2020-11-01 12:30:50 -0700
commit0f7a903ba3f0f8dfb347fb15b783aade4833826e (patch)
treecf409fc33c43399717c237f376ae6871b0178168 /hw/vfio/common.c
parent700d20b49e303549b32d3a7a3efbfcee8c7a4f6c (diff)
downloadqemu-arm-0f7a903ba3f0f8dfb347fb15b783aade4833826e.tar.gz
vfio: Add function to unmap VFIO region
This function will be used for migration region. Migration region is mmaped when migration starts and will be unmapped when migration is complete. Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com> Reviewed-by: Neo Jia <cjia@nvidia.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'hw/vfio/common.c')
-rw-r--r--hw/vfio/common.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 13471ae294..c6e98b8d61 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -924,6 +924,18 @@ int vfio_region_setup(Object *obj, VFIODevice *vbasedev, VFIORegion *region,
return 0;
}
+static void vfio_subregion_unmap(VFIORegion *region, int index)
+{
+ trace_vfio_region_unmap(memory_region_name(&region->mmaps[index].mem),
+ region->mmaps[index].offset,
+ region->mmaps[index].offset +
+ region->mmaps[index].size - 1);
+ memory_region_del_subregion(region->mem, &region->mmaps[index].mem);
+ munmap(region->mmaps[index].mmap, region->mmaps[index].size);
+ object_unparent(OBJECT(&region->mmaps[index].mem));
+ region->mmaps[index].mmap = NULL;
+}
+
int vfio_region_mmap(VFIORegion *region)
{
int i, prot = 0;
@@ -954,10 +966,7 @@ int vfio_region_mmap(VFIORegion *region)
region->mmaps[i].mmap = NULL;
for (i--; i >= 0; i--) {
- memory_region_del_subregion(region->mem, &region->mmaps[i].mem);
- munmap(region->mmaps[i].mmap, region->mmaps[i].size);
- object_unparent(OBJECT(&region->mmaps[i].mem));
- region->mmaps[i].mmap = NULL;
+ vfio_subregion_unmap(region, i);
}
return ret;
@@ -982,6 +991,21 @@ int vfio_region_mmap(VFIORegion *region)
return 0;
}
+void vfio_region_unmap(VFIORegion *region)
+{
+ int i;
+
+ if (!region->mem) {
+ return;
+ }
+
+ for (i = 0; i < region->nr_mmaps; i++) {
+ if (region->mmaps[i].mmap) {
+ vfio_subregion_unmap(region, i);
+ }
+ }
+}
+
void vfio_region_exit(VFIORegion *region)
{
int i;