diff options
| -rw-r--r-- | util/vfio-helpers.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c index 77cdec845d..306b5a83e4 100644 --- a/util/vfio-helpers.c +++ b/util/vfio-helpers.c @@ -721,6 +721,21 @@ qemu_vfio_find_temp_iova(QEMUVFIOState *s, size_t size, uint64_t *iova) return -ENOMEM; } +/** + * qemu_vfio_water_mark_reached: + * + * Returns %true if high watermark has been reached, %false otherwise. + */ +static bool qemu_vfio_water_mark_reached(QEMUVFIOState *s, size_t size, + Error **errp) +{ + if (s->high_water_mark - s->low_water_mark + 1 < size) { + error_setg(errp, "iova exhausted (water mark reached)"); + return true; + } + return false; +} + /* Map [host, host + size) area into a contiguous IOVA address space, and store * the result in @iova if not NULL. The caller need to make sure the area is * aligned to page size, and mustn't overlap with existing mapping areas (split @@ -742,7 +757,7 @@ int qemu_vfio_dma_map(QEMUVFIOState *s, void *host, size_t size, if (mapping) { iova0 = mapping->iova + ((uint8_t *)host - (uint8_t *)mapping->host); } else { - if (s->high_water_mark - s->low_water_mark + 1 < size) { + if (qemu_vfio_water_mark_reached(s, size, errp)) { ret = -ENOMEM; goto out; } |