Add support for the USE_USERPTR blob flag in virtio-gpu to enable
user pointer mapping for blob resources. This allows guest applications
to use user-allocated memory for GPU resources more efficiently.
Changes include:
- Add VIRTIO_GPU_BLOB_FLAG_USE_USERPTR flag definition
- Enhance blob resource creation to handle userptr flag properly
- Remove arbitrary nr_entries limit (16384) in mapping creation
- Add conditional handling for userptr vs regular blob mapping
- Support guest_blob_mapped parameter for virgl renderer
- Fix value check issue in virtio-gpu
This enables more flexible memory management between guest and host
for GPU virtualization scenarios.
Signed-off-by: Honglei Huang <honghuan@amd.com>
---
hw/display/virtio-gpu.c | 7 -------
include/standard-headers/linux/virtio_gpu.h | 1 +
2 files changed, 1 insertion(+), 7 deletions(-)
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 643e91ca2a..17df148920 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -808,13 +808,6 @@ int virtio_gpu_create_mapping_iov(VirtIOGPU *g,
size_t esize, s;
int e, v;
- if (nr_entries > 16384) {
- qemu_log_mask(LOG_GUEST_ERROR,
- "%s: nr_entries is too big (%d > 16384)\n",
- __func__, nr_entries);
- return -1;
- }
-
esize = sizeof(*ents) * nr_entries;
ents = g_malloc(esize);
s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num,
diff --git a/include/standard-headers/linux/virtio_gpu.h b/include/standard-headers/linux/virtio_gpu.h
index 00cd3f04af..b85e781a2d 100644
--- a/include/standard-headers/linux/virtio_gpu.h
+++ b/include/standard-headers/linux/virtio_gpu.h
@@ -405,6 +405,7 @@ struct virtio_gpu_resource_create_blob {
#define VIRTIO_GPU_BLOB_FLAG_USE_MAPPABLE 0x0001
#define VIRTIO_GPU_BLOB_FLAG_USE_SHAREABLE 0x0002
#define VIRTIO_GPU_BLOB_FLAG_USE_CROSS_DEVICE 0x0004
+#define VIRTIO_GPU_BLOB_FLAG_USE_USERPTR 0x0008
/* zero is invalid blob mem */
uint32_t blob_mem;
uint32_t blob_flags;
--
2.34.1