[PATCH v9 00/11] Support blob memory and venus on qemu

[PATCH v9 00/11] Support blob memory and venus on qemu

[Dmitry Osipenko]

Hello,

This series enables Vulkan Venus context support on virtio-gpu.

All virglrender and almost all Linux kernel prerequisite changes
needed by Venus are already in upstream. For kernel there is a pending
KVM patchset that fixes mapping of compound pages needed for DRM drivers
using TTM [1], othewrwise hostmem blob mapping will fail with a KVM error
from Qemu.

[1] https://lore.kernel.org/kvm/20240229025759.1187910-1-stevensd@google.com/

Example Qemu cmdline that enables Venus for virtio-gpu:

  qemu-system-x86_64 -device virtio-vga-gl,hostmem=4G,blob=true,vulkan=true

Changes from V8 to V9

- Added resuming of cmdq processing when hostmem MR is freed,
  as was suggested by Akihiko Odaki.

- Added more error messages, suggested by Akihiko Odaki

- Dropped superfluous 'res->async_unmap_completed', suggested
  by Akihiko Odaki.

- Kept using cmd->suspended flag. Akihiko Odaki suggested to make
  virtio_gpu_virgl_process_cmd() return false if cmd processing is
  suspended, but it's not easy to implement due to ubiquitous
  VIRTIO_GPU_FILL_CMD() macros that returns void, requiring to change
  all the virtio-gpu processing code.

- Added back virtio_gpu_virgl_resource as was requested by Akihiko Odaki,
  though I'm not convinced it's really needed.

- Switched to use GArray, renamed capset2_max_ver/size vars and moved
  "vulkan" property definition to the virtio-gpu-gl device in the Venus
  patch, like was suggested by Akihiko Odaki.

- Moved UUID to virtio_gpu_virgl_resource and dropped UUID save/restore
  since it will require bumping VM version and virgl device isn't miratable
  anyways.

- Fixed exposing UUID feature with Rutabaga

- Dropped linux-headers update patch because headers were already updated
  in Qemu/staging.

- Added patch that updates virtio migration doc with a note about virtio-gpu
  migration specifics, suggested by Akihiko Odaki.

- Addressed coding style issue noticed by Akihiko Odaki

Changes from V7 to V8

- Supported suspension of virtio-gpu commands processing and made
  unmapping of hostmem region asynchronous by blocking/suspending
  cmd processing until region is unmapped. Suggested by Akihiko Odaki.

- Fixed arm64 building of x86 targets using updated linux-headers.
  Corrected the update script. Thanks to Rob Clark for reporting
  the issue.

- Added new patch that makes registration of virgl capsets dynamic.
  Requested by Antonio Caggiano and Pierre-Eric Pelloux-Prayer.

- Venus capset now isn't advertised if Vulkan is disabled with vulkan=false

Changes from V6 to V7

- Used scripts/update-linux-headers.sh to update Qemu headers based
  on Linux v6.8-rc3 that adds Venus capset definition to virtio-gpu
  protocol, was requested by Peter Maydel

- Added r-bs that were given to v6 patches. Corrected missing s-o-bs

- Dropped context_init Qemu's virtio-gpu device configuration flag,
  was suggested by Marc-André Lureau

- Added missing error condition checks spotted by Marc-André Lureau
  and Akihiko Odaki, and few more

- Returned back res->mr referencing to memory_region_init_ram_ptr() like
  was suggested by Akihiko Odaki. Incorporated fix suggested by Pierre-Eric
  to specify the MR name

- Dropped the virgl_gpu_resource wrapper, cleaned up and simplified
  patch that adds blob-cmd support

- Fixed improper blob resource removal from resource list on resource_unref
  that was spotted by Akihiko Odaki

- Change order of the blob patches, was suggested by Akihiko Odaki.
  The cmd_set_scanout_blob support is enabled first

- Factored out patch that adds resource management support to virtio-gpu-gl,
  was requested by Marc-André Lureau

- Simplified and improved the UUID support patch, dropped the hash table
  as we don't need it for now. Moved QemuUUID to virtio_gpu_simple_resource.
  This all was suggested by Akihiko Odaki and Marc-André Lureau

- Dropped console_has_gl() check, suggested by Akihiko Odaki

- Reworked Meson cheking of libvirglrender features, made new features
  available based on virglrender pkgconfig version instead of checking
  symbols in header. This should fix build error using older virglrender
  version, reported by Alex Bennée

- Made enabling of Venus context configrable via new virtio-gpu device
  "vulkan=true" flag, suggested by Marc-André Lureau. The flag is disabled
  by default because it requires blob and hostmem options to be enabled
  and configured

Changes from V5 to V6

- Move macros configurations under virgl.found() and rename
  HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS.

- Handle the case while context_init is disabled.

- Enable context_init by default.

- Move virtio_gpu_virgl_resource_unmap() into
  virgl_cmd_resource_unmap_blob().

- Introduce new struct virgl_gpu_resource to store virgl specific members.

- Remove erro handling of g_new0, because glib will abort() on OOM.

- Set resource uuid as option.

- Implement optional subsection of vmstate_virtio_gpu_resource_uuid_state
  for virtio live migration.

- Use g_int_hash/g_int_equal instead of the default

- Add scanout_blob function for virtio-gpu-virgl

- Resolve the memory leak on virtio-gpu-virgl

- Remove the unstable API flags check because virglrenderer is already 1.0

- Squash the render server flag support into "Initialize Venus"

Changes from V4 (virtio gpu V4) to V5

- Inverted patch 5 and 6 because we should configure
  HAVE_VIRGL_CONTEXT_INIT firstly.

- Validate owner of memory region to avoid slowing down DMA.

- Use memory_region_init_ram_ptr() instead of
  memory_region_init_ram_device_ptr().

- Adjust sequence to allocate gpu resource before virglrender resource
  creation

- Add virtio migration handling for uuid.

- Send kernel patch to define VIRTIO_GPU_CAPSET_VENUS.
  https://lore.kernel.org/lkml/20230915105918.3763061-1-ray.huang@amd.com/

- Add meson check to make sure unstable APIs defined from 0.9.0.

Changes from V1 to V2 (virtio gpu V4)

- Remove unused #include "hw/virtio/virtio-iommu.h"

- Add a local function, called virgl_resource_destroy(), that is used
  to release a vgpu resource on error paths and in resource_unref.

- Remove virtio_gpu_virgl_resource_unmap from
  virtio_gpu_cleanup_mapping(),
  since this function won't be called on blob resources and also because
  blob resources are unmapped via virgl_cmd_resource_unmap_blob().

- In virgl_cmd_resource_create_blob(), do proper cleanup in error paths
  and move QTAILQ_INSERT_HEAD(&g->reslist, res, next) after the resource
  has been fully initialized.

- Memory region has a different life-cycle from virtio gpu resources
  i.e. cannot be released synchronously along with the vgpu resource.
  So, here the field "region" was changed to a pointer and is allocated
  dynamically when the blob is mapped.
  Also, since the pointer can be used to indicate whether the blob
  is mapped, the explicite field "mapped" was removed.

- In virgl_cmd_resource_map_blob(), add check on the value of
  res->region, to prevent beeing called twice on the same resource.

- Add a patch to enable automatic deallocation of memory regions to resolve
  use-after-free memory corruption with a reference.

Antonio Caggiano (3):
  virtio-gpu: Handle resource blob commands
  virtio-gpu: Resource UUID
  virtio-gpu: Support Venus context

Dmitry Osipenko (4):
  virtio-gpu: Use pkgconfig version to decide which virgl features are
    available
  virtio-gpu: Don't require udmabuf when blobs and virgl are enabled
  virtio-gpu: Support suspension of commands processing
  migration/virtio: Add virtio-gpu section

Huang Rui (2):
  virtio-gpu: Support context-init feature with virglrenderer
  virtio-gpu: Add virgl resource management

Pierre-Eric Pelloux-Prayer (1):
  virtio-gpu: Register capsets dynamically

Robert Beckett (1):
  virtio-gpu: Support blob scanout using dmabuf fd

 docs/devel/migration/virtio.rst  |   7 +
 hw/display/trace-events          |   1 +
 hw/display/virtio-gpu-base.c     |   3 +
 hw/display/virtio-gpu-gl.c       |   7 +
 hw/display/virtio-gpu-rutabaga.c |   1 +
 hw/display/virtio-gpu-virgl.c    | 561 ++++++++++++++++++++++++++++++-
 hw/display/virtio-gpu.c          |  35 +-
 include/hw/virtio/virtio-gpu.h   |  13 +
 meson.build                      |  10 +-
 9 files changed, 610 insertions(+), 28 deletions(-)

-- 
2.44.0

[PATCH v9 01/11] virtio-gpu: Use pkgconfig version to decide which virgl features are available

[Dmitry Osipenko]

New virglrerenderer features were stabilized with release of v1.0.0.
Presence of symbols in virglrenderer.h doesn't guarantee ABI compatibility
with pre-release development versions of libvirglerender. Use virglrenderer
version to decide reliably which virgl features are available.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 meson.build | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/meson.build b/meson.build
index 553b9409995b..c6f22f565071 100644
--- a/meson.build
+++ b/meson.build
@@ -2286,11 +2286,8 @@ config_host_data.set('CONFIG_PNG', png.found())
 config_host_data.set('CONFIG_VNC', vnc.found())
 config_host_data.set('CONFIG_VNC_JPEG', jpeg.found())
 config_host_data.set('CONFIG_VNC_SASL', sasl.found())
-if virgl.found()
-  config_host_data.set('HAVE_VIRGL_D3D_INFO_EXT',
-                       cc.has_member('struct virgl_renderer_resource_info_ext', 'd3d_tex2d',
-                                     prefix: '#include <virglrenderer.h>',
-                                     dependencies: virgl))
+if virgl.version().version_compare('>=1.0.0')
+  config_host_data.set('HAVE_VIRGL_D3D_INFO_EXT', 1)
 endif
 config_host_data.set('CONFIG_VIRTFS', have_virtfs)
 config_host_data.set('CONFIG_VTE', vte.found())
-- 
2.44.0

[PATCH v9 02/11] virtio-gpu: Support context-init feature with virglrenderer

[Dmitry Osipenko]

From: Huang Rui <ray.huang@amd.com>

Patch "virtio-gpu: CONTEXT_INIT feature" has added the context_init
feature flags. Expose this feature and support creating virglrenderer
context with flags using context_id if libvirglrenderer is new enough.

Originally-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Antonio Caggiano <quic_acaggian@quicinc.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c    |  4 ++++
 hw/display/virtio-gpu-virgl.c | 20 ++++++++++++++++++--
 meson.build                   |  1 +
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index e06be60dfbfc..ba478124e2c2 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -127,6 +127,10 @@ static void virtio_gpu_gl_device_realize(DeviceState *qdev, Error **errp)
     VIRTIO_GPU_BASE(g)->virtio_config.num_capsets =
         virtio_gpu_virgl_get_num_capsets(g);
 
+#ifdef HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS
+    g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED;
+#endif
+
     virtio_gpu_device_realize(qdev, errp);
 }
 
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 9f34d0e6619c..ef598d8d23ee 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -106,8 +106,24 @@ static void virgl_cmd_context_create(VirtIOGPU *g,
     trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id,
                                     cc.debug_name);
 
-    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen,
-                                  cc.debug_name);
+    if (cc.context_init) {
+        if (!virtio_gpu_context_init_enabled(g->parent_obj.conf)) {
+            qemu_log_mask(LOG_GUEST_ERROR, "%s: context_init disabled",
+                          __func__);
+            cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
+            return;
+        }
+
+#ifdef HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS
+        virgl_renderer_context_create_with_flags(cc.hdr.ctx_id,
+                                                 cc.context_init,
+                                                 cc.nlen,
+                                                 cc.debug_name);
+        return;
+#endif
+    }
+
+    virgl_renderer_context_create(cc.hdr.ctx_id, cc.nlen, cc.debug_name);
 }
 
 static void virgl_cmd_context_destroy(VirtIOGPU *g,
diff --git a/meson.build b/meson.build
index c6f22f565071..c131db46b2a6 100644
--- a/meson.build
+++ b/meson.build
@@ -2288,6 +2288,7 @@ config_host_data.set('CONFIG_VNC_JPEG', jpeg.found())
 config_host_data.set('CONFIG_VNC_SASL', sasl.found())
 if virgl.version().version_compare('>=1.0.0')
   config_host_data.set('HAVE_VIRGL_D3D_INFO_EXT', 1)
+  config_host_data.set('HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS', 1)
 endif
 config_host_data.set('CONFIG_VIRTFS', have_virtfs)
 config_host_data.set('CONFIG_VTE', vte.found())
-- 
2.44.0

[PATCH v9 03/11] virtio-gpu: Don't require udmabuf when blobs and virgl are enabled

[Dmitry Osipenko]

The udmabuf usage is mandatory when virgl is disabled and blobs feature
enabled in the Qemu machine configuration. If virgl and blobs are enabled,
then udmabuf requirement is optional. Since udmabuf isn't widely supported
by a popular Linux distros today, let's relax the udmabuf requirement for
blobs=on,virgl=on. Now, a full-featured virtio-gpu acceleration is
available to Qemu users without a need to have udmabuf available in the
system.

Reviewed-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Antonio Caggiano <quic_acaggian@quicinc.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index ae831b6b3e3e..dac272ecadb1 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1472,6 +1472,7 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
 
     if (virtio_gpu_blob_enabled(g->parent_obj.conf)) {
         if (!virtio_gpu_rutabaga_enabled(g->parent_obj.conf) &&
+            !virtio_gpu_virgl_enabled(g->parent_obj.conf) &&
             !virtio_gpu_have_udmabuf()) {
             error_setg(errp, "need rutabaga or udmabuf for blob resources");
             return;
-- 
2.44.0

[PATCH v9 04/11] virtio-gpu: Add virgl resource management

[Dmitry Osipenko]

From: Huang Rui <ray.huang@amd.com>

In a preparation to adding host blobs support to virtio-gpu, add virgl
resource management that allows to retrieve resource based on its ID
and virgl resource wrapper on top of simple resource that will be contain
fields specific to virgl.

Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Antonio Caggiano <quic_acaggian@quicinc.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-virgl.c | 74 +++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index ef598d8d23ee..7c7ffb0c251e 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -22,6 +22,23 @@
 
 #include <virglrenderer.h>
 
+struct virtio_gpu_virgl_resource {
+    struct virtio_gpu_simple_resource base;
+};
+
+static struct virtio_gpu_virgl_resource *
+virtio_gpu_virgl_find_resource(VirtIOGPU *g, uint32_t resource_id)
+{
+    struct virtio_gpu_simple_resource *res;
+
+    res = virtio_gpu_find_resource(g, resource_id);
+    if (!res) {
+        return NULL;
+    }
+
+    return container_of(res, struct virtio_gpu_virgl_resource, base);
+}
+
 #if VIRGL_RENDERER_CALLBACKS_VERSION >= 4
 static void *
 virgl_get_egl_display(G_GNUC_UNUSED void *cookie)
@@ -35,11 +52,34 @@ static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
 {
     struct virtio_gpu_resource_create_2d c2d;
     struct virgl_renderer_resource_create_args args;
+    struct virtio_gpu_virgl_resource *res;
 
     VIRTIO_GPU_FILL_CMD(c2d);
     trace_virtio_gpu_cmd_res_create_2d(c2d.resource_id, c2d.format,
                                        c2d.width, c2d.height);
 
+    if (c2d.resource_id == 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not allowed\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = virtio_gpu_virgl_find_resource(g, c2d.resource_id);
+    if (res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already exists %d\n",
+                      __func__, c2d.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = g_new0(struct virtio_gpu_virgl_resource, 1);
+    res->base.width = c2d.width;
+    res->base.height = c2d.height;
+    res->base.format = c2d.format;
+    res->base.resource_id = c2d.resource_id;
+    QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
+
     args.handle = c2d.resource_id;
     args.target = 2;
     args.format = c2d.format;
@@ -59,11 +99,34 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
 {
     struct virtio_gpu_resource_create_3d c3d;
     struct virgl_renderer_resource_create_args args;
+    struct virtio_gpu_virgl_resource *res;
 
     VIRTIO_GPU_FILL_CMD(c3d);
     trace_virtio_gpu_cmd_res_create_3d(c3d.resource_id, c3d.format,
                                        c3d.width, c3d.height, c3d.depth);
 
+    if (c3d.resource_id == 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not allowed\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = virtio_gpu_virgl_find_resource(g, c3d.resource_id);
+    if (res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already exists %d\n",
+                      __func__, c3d.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = g_new0(struct virtio_gpu_virgl_resource, 1);
+    res->base.width = c3d.width;
+    res->base.height = c3d.height;
+    res->base.format = c3d.format;
+    res->base.resource_id = c3d.resource_id;
+    QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
+
     args.handle = c3d.resource_id;
     args.target = c3d.target;
     args.format = c3d.format;
@@ -82,12 +145,19 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
                                      struct virtio_gpu_ctrl_command *cmd)
 {
     struct virtio_gpu_resource_unref unref;
+    struct virtio_gpu_virgl_resource *res;
     struct iovec *res_iovs = NULL;
     int num_iovs = 0;
 
     VIRTIO_GPU_FILL_CMD(unref);
     trace_virtio_gpu_cmd_res_unref(unref.resource_id);
 
+    res = virtio_gpu_virgl_find_resource(g, unref.resource_id);
+    if (!res) {
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
     virgl_renderer_resource_detach_iov(unref.resource_id,
                                        &res_iovs,
                                        &num_iovs);
@@ -95,6 +165,10 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
         virtio_gpu_cleanup_mapping_iov(g, res_iovs, num_iovs);
     }
     virgl_renderer_resource_unref(unref.resource_id);
+
+    QTAILQ_REMOVE(&g->reslist, &res->base, next);
+
+    g_free(res);
 }
 
 static void virgl_cmd_context_create(VirtIOGPU *g,
-- 
2.44.0

[PATCH v9 05/11] virtio-gpu: Support blob scanout using dmabuf fd

[Dmitry Osipenko]

From: Robert Beckett <bob.beckett@collabora.com>

Support displaying blob resources by handling SET_SCANOUT_BLOB
command.

Signed-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Antonio Caggiano <quic_acaggian@quicinc.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-virgl.c  | 109 +++++++++++++++++++++++++++++++++
 hw/display/virtio-gpu.c        |  12 ++--
 include/hw/virtio/virtio-gpu.h |   7 +++
 meson.build                    |   1 +
 4 files changed, 123 insertions(+), 6 deletions(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 7c7ffb0c251e..14e94a82dd6a 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -17,6 +17,8 @@
 #include "trace.h"
 #include "hw/virtio/virtio.h"
 #include "hw/virtio/virtio-gpu.h"
+#include "hw/virtio/virtio-gpu-bswap.h"
+#include "hw/virtio/virtio-gpu-pixman.h"
 
 #include "ui/egl-helpers.h"
 
@@ -78,6 +80,7 @@ static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
     res->base.height = c2d.height;
     res->base.format = c2d.format;
     res->base.resource_id = c2d.resource_id;
+    res->base.dmabuf_fd = -1;
     QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
 
     args.handle = c2d.resource_id;
@@ -125,6 +128,7 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
     res->base.height = c3d.height;
     res->base.format = c3d.format;
     res->base.resource_id = c3d.resource_id;
+    res->base.dmabuf_fd = -1;
     QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
 
     args.handle = c3d.resource_id;
@@ -507,6 +511,106 @@ static void virgl_cmd_get_capset(VirtIOGPU *g,
     g_free(resp);
 }
 
+#ifdef HAVE_VIRGL_RESOURCE_BLOB
+static void virgl_cmd_set_scanout_blob(VirtIOGPU *g,
+                                       struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_framebuffer fb = { 0 };
+    struct virgl_renderer_resource_info info;
+    struct virtio_gpu_virgl_resource *res;
+    struct virtio_gpu_set_scanout_blob ss;
+    uint64_t fbend;
+
+    VIRTIO_GPU_FILL_CMD(ss);
+    virtio_gpu_scanout_blob_bswap(&ss);
+    trace_virtio_gpu_cmd_set_scanout_blob(ss.scanout_id, ss.resource_id,
+                                          ss.r.width, ss.r.height, ss.r.x,
+                                          ss.r.y);
+
+    if (ss.scanout_id >= g->parent_obj.conf.max_outputs) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: illegal scanout id specified %d",
+                      __func__, ss.scanout_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID;
+        return;
+    }
+
+    if (ss.resource_id == 0) {
+        virtio_gpu_disable_scanout(g, ss.scanout_id);
+        return;
+    }
+
+    if (ss.width < 16 ||
+        ss.height < 16 ||
+        ss.r.x + ss.r.width > ss.width ||
+        ss.r.y + ss.r.height > ss.height) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: illegal scanout %d bounds for"
+                      " resource %d, rect (%d,%d)+%d,%d, fb %d %d\n",
+                      __func__, ss.scanout_id, ss.resource_id,
+                      ss.r.x, ss.r.y, ss.r.width, ss.r.height,
+                      ss.width, ss.height);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    res = virtio_gpu_virgl_find_resource(g, ss.resource_id);
+    if (!res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
+                      __func__, ss.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+    if (virgl_renderer_resource_get_info(ss.resource_id, &info)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not have info %d\n",
+                      __func__, ss.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+    if (res->base.dmabuf_fd < 0) {
+        res->base.dmabuf_fd = info.fd;
+    }
+    if (res->base.dmabuf_fd < 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource not backed by dmabuf %d\n",
+                      __func__, ss.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    fb.format = virtio_gpu_get_pixman_format(ss.format);
+    if (!fb.format) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: pixel format not supported %d\n",
+                      __func__, ss.format);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    fb.bytes_pp = DIV_ROUND_UP(PIXMAN_FORMAT_BPP(fb.format), 8);
+    fb.width = ss.width;
+    fb.height = ss.height;
+    fb.stride = ss.strides[0];
+    fb.offset = ss.offsets[0] + ss.r.x * fb.bytes_pp + ss.r.y * fb.stride;
+
+    fbend = fb.offset;
+    fbend += fb.stride * (ss.r.height - 1);
+    fbend += fb.bytes_pp * ss.r.width;
+    if (fbend > res->base.blob_size) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: fb end out of range\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    g->parent_obj.enable = 1;
+    if (virtio_gpu_update_dmabuf(g, ss.scanout_id, &res->base, &fb, &ss.r)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to update dmabuf\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    virtio_gpu_update_scanout(g, ss.scanout_id, &res->base, &fb, &ss.r);
+}
+#endif /* HAVE_VIRGL_RESOURCE_BLOB */
+
 void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                       struct virtio_gpu_ctrl_command *cmd)
 {
@@ -573,6 +677,11 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
     case VIRTIO_GPU_CMD_GET_EDID:
         virtio_gpu_get_edid(g, cmd);
         break;
+#ifdef HAVE_VIRGL_RESOURCE_BLOB
+    case VIRTIO_GPU_CMD_SET_SCANOUT_BLOB:
+        virgl_cmd_set_scanout_blob(g, cmd);
+        break;
+#endif /* HAVE_VIRGL_RESOURCE_BLOB */
     default:
         cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
         break;
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index dac272ecadb1..1e57a53d346c 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -380,7 +380,7 @@ static void virtio_gpu_resource_create_blob(VirtIOGPU *g,
     QTAILQ_INSERT_HEAD(&g->reslist, res, next);
 }
 
-static void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
+void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id)
 {
     struct virtio_gpu_scanout *scanout = &g->parent_obj.scanout[scanout_id];
     struct virtio_gpu_simple_resource *res;
@@ -597,11 +597,11 @@ static void virtio_unref_resource(pixman_image_t *image, void *data)
     pixman_image_unref(data);
 }
 
-static void virtio_gpu_update_scanout(VirtIOGPU *g,
-                                      uint32_t scanout_id,
-                                      struct virtio_gpu_simple_resource *res,
-                                      struct virtio_gpu_framebuffer *fb,
-                                      struct virtio_gpu_rect *r)
+void virtio_gpu_update_scanout(VirtIOGPU *g,
+                               uint32_t scanout_id,
+                               struct virtio_gpu_simple_resource *res,
+                               struct virtio_gpu_framebuffer *fb,
+                               struct virtio_gpu_rect *r)
 {
     struct virtio_gpu_simple_resource *ores;
     struct virtio_gpu_scanout *scanout;
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index ed44cdad6b34..44c676c3ca4a 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -329,6 +329,13 @@ int virtio_gpu_update_dmabuf(VirtIOGPU *g,
                              struct virtio_gpu_framebuffer *fb,
                              struct virtio_gpu_rect *r);
 
+void virtio_gpu_update_scanout(VirtIOGPU *g,
+                               uint32_t scanout_id,
+                               struct virtio_gpu_simple_resource *res,
+                               struct virtio_gpu_framebuffer *fb,
+                               struct virtio_gpu_rect *r);
+void virtio_gpu_disable_scanout(VirtIOGPU *g, int scanout_id);
+
 /* virtio-gpu-3d.c */
 void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                   struct virtio_gpu_ctrl_command *cmd);
diff --git a/meson.build b/meson.build
index c131db46b2a6..5ef50811b6ba 100644
--- a/meson.build
+++ b/meson.build
@@ -2289,6 +2289,7 @@ config_host_data.set('CONFIG_VNC_SASL', sasl.found())
 if virgl.version().version_compare('>=1.0.0')
   config_host_data.set('HAVE_VIRGL_D3D_INFO_EXT', 1)
   config_host_data.set('HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS', 1)
+  config_host_data.set('HAVE_VIRGL_RESOURCE_BLOB', 1)
 endif
 config_host_data.set('CONFIG_VIRTFS', have_virtfs)
 config_host_data.set('CONFIG_VTE', vte.found())
-- 
2.44.0

[PATCH v9 06/11] virtio-gpu: Support suspension of commands processing

[Dmitry Osipenko]

Add new "suspended" flag to virtio_gpu_ctrl_command telling cmd
processor that it should stop processing commands and retry again
next time until flag is unset.

Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c       | 1 +
 hw/display/virtio-gpu-rutabaga.c | 1 +
 hw/display/virtio-gpu-virgl.c    | 3 +++
 hw/display/virtio-gpu.c          | 5 +++++
 include/hw/virtio/virtio-gpu.h   | 1 +
 5 files changed, 11 insertions(+)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index ba478124e2c2..a8892bcc5346 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -79,6 +79,7 @@ static void virtio_gpu_gl_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutabaga.c
index 17bf701a2163..b6e84d436fb2 100644
--- a/hw/display/virtio-gpu-rutabaga.c
+++ b/hw/display/virtio-gpu-rutabaga.c
@@ -1061,6 +1061,7 @@ static void virtio_gpu_rutabaga_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 14e94a82dd6a..0feaa9f2c52e 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -687,6 +687,9 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         break;
     }
 
+    if (cmd->suspended) {
+        return;
+    }
     if (cmd->finished) {
         return;
     }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 1e57a53d346c..a1bd4d6914c4 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1054,6 +1054,10 @@ void virtio_gpu_process_cmdq(VirtIOGPU *g)
         /* process command */
         vgc->process_cmd(g, cmd);
 
+        if (cmd->suspended) {
+            break;
+        }
+
         QTAILQ_REMOVE(&g->cmdq, cmd, next);
         if (virtio_gpu_stats_enabled(g->parent_obj.conf)) {
             g->stats.requests++;
@@ -1113,6 +1117,7 @@ static void virtio_gpu_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
         cmd->vq = vq;
         cmd->error = 0;
         cmd->finished = false;
+        cmd->suspended = false;
         QTAILQ_INSERT_TAIL(&g->cmdq, cmd, next);
         cmd = virtqueue_pop(vq, sizeof(struct virtio_gpu_ctrl_command));
     }
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 44c676c3ca4a..dc24360656ce 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -132,6 +132,7 @@ struct virtio_gpu_ctrl_command {
     struct virtio_gpu_ctrl_hdr cmd_hdr;
     uint32_t error;
     bool finished;
+    bool suspended;
     QTAILQ_ENTRY(virtio_gpu_ctrl_command) next;
 };
 
-- 
2.44.0

[PATCH v9 07/11] virtio-gpu: Handle resource blob commands

[Dmitry Osipenko]

From: Antonio Caggiano <antonio.caggiano@collabora.com>

Support BLOB resources creation, mapping and unmapping by calling the
new stable virglrenderer 0.10 interface. Only enabled when available and
via the blob config. E.g. -device virtio-vga-gl,blob=true

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Xenia Ragiadakou <xenia.ragiadakou@amd.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-virgl.c | 268 ++++++++++++++++++++++++++++++++++
 hw/display/virtio-gpu.c       |   4 +-
 2 files changed, 271 insertions(+), 1 deletion(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 0feaa9f2c52e..73d4acbf1777 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -26,6 +26,8 @@
 
 struct virtio_gpu_virgl_resource {
     struct virtio_gpu_simple_resource base;
+    bool async_unmap_in_progress;
+    MemoryRegion *mr;
 };
 
 static struct virtio_gpu_virgl_resource *
@@ -49,6 +51,120 @@ virgl_get_egl_display(G_GNUC_UNUSED void *cookie)
 }
 #endif
 
+#ifdef HAVE_VIRGL_RESOURCE_BLOB
+struct virtio_gpu_virgl_hostmem_region {
+    MemoryRegion mr;
+    struct VirtIOGPU *g;
+    struct virtio_gpu_virgl_resource *res;
+};
+
+static void virtio_gpu_virgl_resume_cmdq(void *opaque)
+{
+    VirtIOGPU *g = opaque;
+
+    virtio_gpu_process_cmdq(g);
+}
+
+static void virtio_gpu_virgl_hostmem_region_free(void *obj)
+{
+    MemoryRegion *mr = MEMORY_REGION(obj);
+    struct virtio_gpu_virgl_hostmem_region *vmr;
+    VirtIOGPUBase *b;
+
+    vmr = container_of(mr, struct virtio_gpu_virgl_hostmem_region, mr);
+    vmr->res->async_unmap_in_progress = false;
+
+    b = VIRTIO_GPU_BASE(vmr->g);
+    b->renderer_blocked--;
+
+    /*
+     * memory_region_unref() may be executed from RCU thread context, while
+     * virglrenderer works only on the main-loop thread that's holding GL
+     * context.
+     */
+    aio_bh_schedule_oneshot(qemu_get_aio_context(),
+                            virtio_gpu_virgl_resume_cmdq, vmr->g);
+    g_free(vmr);
+}
+
+static int
+virtio_gpu_virgl_map_resource_blob(VirtIOGPU *g,
+                                   struct virtio_gpu_virgl_resource *res,
+                                   uint64_t offset)
+{
+    struct virtio_gpu_virgl_hostmem_region *vmr;
+    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
+    MemoryRegion *mr;
+    uint64_t size;
+    void *data;
+    int ret;
+
+    if (!virtio_gpu_hostmem_enabled(b->conf)) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: hostmem disabled\n", __func__);
+        return -EOPNOTSUPP;
+    }
+
+    ret = virgl_renderer_resource_map(res->base.resource_id, &data, &size);
+    if (ret) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to map virgl resource\n",
+                      __func__);
+        return -ret;
+    }
+
+    vmr = g_new0(struct virtio_gpu_virgl_hostmem_region, 1);
+    vmr->res = res;
+    vmr->g = g;
+
+    mr = &vmr->mr;
+    memory_region_init_ram_ptr(mr, OBJECT(mr), "blob", size, data);
+    memory_region_add_subregion(&b->hostmem, offset, mr);
+    memory_region_set_enabled(mr, true);
+
+    /*
+     * Potentially, MR could outlive the resource if MR's reference is held
+     * outside of virtio-gpu. In order to prevent unmapping resource while
+     * MR is alive, and thus, making the data pointer invalid, we will block
+     * virtio-gpu command processing until MR is fully unreferenced and
+     * released.
+     */
+    OBJECT(mr)->free = virtio_gpu_virgl_hostmem_region_free;
+
+    res->mr = mr;
+
+    return 0;
+}
+
+static bool
+virtio_gpu_virgl_unmap_resource_blob(VirtIOGPU *g,
+                                     struct virtio_gpu_virgl_resource *res)
+{
+    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
+
+    if (!res->async_unmap_in_progress && res->mr) {
+        /* memory region owns self res->mr object and frees it by itself */
+        MemoryRegion *mr = res->mr;
+        res->mr = NULL;
+
+        res->async_unmap_in_progress = true;
+
+        /* render will be unblocked when MR is freed */
+        b->renderer_blocked++;
+
+        memory_region_set_enabled(mr, false);
+        memory_region_del_subregion(&b->hostmem, mr);
+        object_unparent(OBJECT(mr));
+    }
+
+    if (res->async_unmap_in_progress) {
+        return false;
+    }
+
+    virgl_renderer_resource_unmap(res->base.resource_id);
+
+    return true;
+}
+#endif /* HAVE_VIRGL_RESOURCE_BLOB */
+
 static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
                                          struct virtio_gpu_ctrl_command *cmd)
 {
@@ -162,6 +278,14 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
         return;
     }
 
+    if (res->mr || cmd->suspended) {
+        bool unmapped = virtio_gpu_virgl_unmap_resource_blob(g, res);
+        cmd->suspended = !unmapped;
+        if (cmd->suspended) {
+            return;
+        }
+    }
+
     virgl_renderer_resource_detach_iov(unref.resource_id,
                                        &res_iovs,
                                        &num_iovs);
@@ -512,6 +636,141 @@ static void virgl_cmd_get_capset(VirtIOGPU *g,
 }
 
 #ifdef HAVE_VIRGL_RESOURCE_BLOB
+static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
+                                           struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virgl_renderer_resource_create_blob_args virgl_args = { 0 };
+    struct virtio_gpu_resource_create_blob cblob;
+    struct virtio_gpu_virgl_resource *res;
+    int ret;
+
+    if (!virtio_gpu_blob_enabled(g->parent_obj.conf)) {
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
+        return;
+    }
+
+    VIRTIO_GPU_FILL_CMD(cblob);
+    virtio_gpu_create_blob_bswap(&cblob);
+    trace_virtio_gpu_cmd_res_create_blob(cblob.resource_id, cblob.size);
+
+    if (cblob.resource_id == 0) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not allowed\n",
+                      __func__);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = virtio_gpu_virgl_find_resource(g, cblob.resource_id);
+    if (res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already exists %d\n",
+                      __func__, cblob.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    res = g_new0(struct virtio_gpu_virgl_resource, 1);
+    res->base.resource_id = cblob.resource_id;
+    res->base.blob_size = cblob.size;
+    res->base.dmabuf_fd = -1;
+
+    if (cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) {
+        ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
+                                            cmd, &res->base.addrs,
+                                            &res->base.iov, &res->base.iov_cnt);
+        if (!ret) {
+            g_free(res);
+            cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
+            return;
+        }
+    }
+
+    QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
+
+    virgl_args.res_handle = cblob.resource_id;
+    virgl_args.ctx_id = cblob.hdr.ctx_id;
+    virgl_args.blob_mem = cblob.blob_mem;
+    virgl_args.blob_id = cblob.blob_id;
+    virgl_args.blob_flags = cblob.blob_flags;
+    virgl_args.size = cblob.size;
+    virgl_args.iovecs = res->base.iov;
+    virgl_args.num_iovs = res->base.iov_cnt;
+
+    ret = virgl_renderer_resource_create_blob(&virgl_args);
+    if (ret) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: virgl blob create error: %s\n",
+                      __func__, strerror(-ret));
+        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
+    }
+}
+
+static void virgl_cmd_resource_map_blob(VirtIOGPU *g,
+                                        struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_resource_map_blob mblob;
+    struct virtio_gpu_virgl_resource *res;
+    struct virtio_gpu_resp_map_info resp;
+    int ret;
+
+    VIRTIO_GPU_FILL_CMD(mblob);
+    virtio_gpu_map_blob_bswap(&mblob);
+
+    res = virtio_gpu_virgl_find_resource(g, mblob.resource_id);
+    if (!res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
+                      __func__, mblob.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    if (res->mr) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already mapped %d\n",
+                      __func__, mblob.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    ret = virtio_gpu_virgl_map_resource_blob(g, res, mblob.offset);
+    if (ret) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource map error: %s\n",
+                      __func__, strerror(ret));
+        cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;
+        return;
+    }
+
+    memset(&resp, 0, sizeof(resp));
+    resp.hdr.type = VIRTIO_GPU_RESP_OK_MAP_INFO;
+    virgl_renderer_resource_get_map_info(mblob.resource_id, &resp.map_info);
+    virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
+}
+
+static void virgl_cmd_resource_unmap_blob(VirtIOGPU *g,
+                                          struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_resource_unmap_blob ublob;
+    struct virtio_gpu_virgl_resource *res;
+
+    VIRTIO_GPU_FILL_CMD(ublob);
+    virtio_gpu_unmap_blob_bswap(&ublob);
+
+    res = virtio_gpu_virgl_find_resource(g, ublob.resource_id);
+    if (!res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
+                      __func__, ublob.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    if (!res->mr && !cmd->suspended) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already unmapped %d\n",
+                      __func__, ublob.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    bool unmapped = virtio_gpu_virgl_unmap_resource_blob(g, res);
+    cmd->suspended = !unmapped;
+}
+
 static void virgl_cmd_set_scanout_blob(VirtIOGPU *g,
                                        struct virtio_gpu_ctrl_command *cmd)
 {
@@ -678,6 +937,15 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         virtio_gpu_get_edid(g, cmd);
         break;
 #ifdef HAVE_VIRGL_RESOURCE_BLOB
+    case VIRTIO_GPU_CMD_RESOURCE_CREATE_BLOB:
+        virgl_cmd_resource_create_blob(g, cmd);
+        break;
+    case VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB:
+        virgl_cmd_resource_map_blob(g, cmd);
+        break;
+    case VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB:
+        virgl_cmd_resource_unmap_blob(g, cmd);
+        break;
     case VIRTIO_GPU_CMD_SET_SCANOUT_BLOB:
         virgl_cmd_set_scanout_blob(g, cmd);
         break;
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index a1bd4d6914c4..45c1f2006712 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1483,10 +1483,12 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
             return;
         }
 
+#ifndef HAVE_VIRGL_RESOURCE_BLOB
         if (virtio_gpu_virgl_enabled(g->parent_obj.conf)) {
-            error_setg(errp, "blobs and virgl are not compatible (yet)");
+            error_setg(errp, "old virglrenderer, blob resources unsupported");
             return;
         }
+#endif
     }
 
     if (!virtio_gpu_base_device_realize(qdev,
-- 
2.44.0

[PATCH v9 08/11] virtio-gpu: Resource UUID

[Dmitry Osipenko]

From: Antonio Caggiano <antonio.caggiano@collabora.com>

Enable resource UUID feature and implement command resource assign UUID.
UUID feature availability is mandatory for Vulkan Venus context.

UUID is intended for sharing dmabufs between virtio devices on host. Qemu
doesn't have second virtio device for sharing, thus a simple stub UUID
implementation is enough. More complete implementation using global UUID
resource table might become interesting for a multi-gpu cases.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/trace-events       |  1 +
 hw/display/virtio-gpu-base.c  |  3 +++
 hw/display/virtio-gpu-virgl.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/hw/display/trace-events b/hw/display/trace-events
index 2336a0ca1570..54d6894c59f4 100644
--- a/hw/display/trace-events
+++ b/hw/display/trace-events
@@ -41,6 +41,7 @@ virtio_gpu_cmd_res_create_blob(uint32_t res, uint64_t size) "res 0x%x, size %" P
 virtio_gpu_cmd_res_unref(uint32_t res) "res 0x%x"
 virtio_gpu_cmd_res_back_attach(uint32_t res) "res 0x%x"
 virtio_gpu_cmd_res_back_detach(uint32_t res) "res 0x%x"
+virtio_gpu_cmd_res_assign_uuid(uint32_t res) "res 0x%x"
 virtio_gpu_cmd_res_xfer_toh_2d(uint32_t res) "res 0x%x"
 virtio_gpu_cmd_res_xfer_toh_3d(uint32_t res) "res 0x%x"
 virtio_gpu_cmd_res_xfer_fromh_3d(uint32_t res) "res 0x%x"
diff --git a/hw/display/virtio-gpu-base.c b/hw/display/virtio-gpu-base.c
index 4fc7ef8896c1..13014b9a73eb 100644
--- a/hw/display/virtio-gpu-base.c
+++ b/hw/display/virtio-gpu-base.c
@@ -226,6 +226,9 @@ virtio_gpu_base_get_features(VirtIODevice *vdev, uint64_t features,
         virtio_gpu_rutabaga_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_VIRGL);
     }
+    if (virtio_gpu_virgl_enabled(g->conf)) {
+        features |= (1 << VIRTIO_GPU_F_RESOURCE_UUID);
+    }
     if (virtio_gpu_edid_enabled(g->conf)) {
         features |= (1 << VIRTIO_GPU_F_EDID);
     }
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 73d4acbf1777..de788df155bf 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -14,6 +14,7 @@
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
 #include "qemu/iov.h"
+#include "qemu/uuid.h"
 #include "trace.h"
 #include "hw/virtio/virtio.h"
 #include "hw/virtio/virtio-gpu.h"
@@ -28,6 +29,7 @@ struct virtio_gpu_virgl_resource {
     struct virtio_gpu_simple_resource base;
     bool async_unmap_in_progress;
     MemoryRegion *mr;
+    QemuUUID uuid;
 };
 
 static struct virtio_gpu_virgl_resource *
@@ -197,6 +199,7 @@ static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
     res->base.format = c2d.format;
     res->base.resource_id = c2d.resource_id;
     res->base.dmabuf_fd = -1;
+    qemu_uuid_generate(&res->uuid);
     QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
 
     args.handle = c2d.resource_id;
@@ -245,6 +248,7 @@ static void virgl_cmd_create_resource_3d(VirtIOGPU *g,
     res->base.format = c3d.format;
     res->base.resource_id = c3d.resource_id;
     res->base.dmabuf_fd = -1;
+    qemu_uuid_generate(&res->uuid);
     QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
 
     args.handle = c3d.resource_id;
@@ -672,6 +676,7 @@ static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
     res->base.resource_id = cblob.resource_id;
     res->base.blob_size = cblob.size;
     res->base.dmabuf_fd = -1;
+    qemu_uuid_generate(&res->uuid);
 
     if (cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) {
         ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
@@ -870,6 +875,31 @@ static void virgl_cmd_set_scanout_blob(VirtIOGPU *g,
 }
 #endif /* HAVE_VIRGL_RESOURCE_BLOB */
 
+static void virgl_cmd_assign_uuid(VirtIOGPU *g,
+                                  struct virtio_gpu_ctrl_command *cmd)
+{
+    struct virtio_gpu_resource_assign_uuid assign;
+    struct virtio_gpu_resp_resource_uuid resp;
+    struct virtio_gpu_virgl_resource *res;
+
+    VIRTIO_GPU_FILL_CMD(assign);
+    virtio_gpu_bswap_32(&assign, sizeof(assign));
+    trace_virtio_gpu_cmd_res_assign_uuid(assign.resource_id);
+
+    res = virtio_gpu_virgl_find_resource(g, assign.resource_id);
+    if (!res) {
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
+                      __func__, assign.resource_id);
+        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
+        return;
+    }
+
+    memset(&resp, 0, sizeof(resp));
+    resp.hdr.type = VIRTIO_GPU_RESP_OK_RESOURCE_UUID;
+    memcpy(resp.uuid, res->uuid.data, sizeof(resp.uuid));
+    virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
+}
+
 void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
                                       struct virtio_gpu_ctrl_command *cmd)
 {
@@ -924,6 +954,9 @@ void virtio_gpu_virgl_process_cmd(VirtIOGPU *g,
         /* TODO add security */
         virgl_cmd_ctx_detach_resource(g, cmd);
         break;
+    case VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID:
+        virgl_cmd_assign_uuid(g, cmd);
+        break;
     case VIRTIO_GPU_CMD_GET_CAPSET_INFO:
         virgl_cmd_get_capset_info(g, cmd);
         break;
-- 
2.44.0

[PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Dmitry Osipenko]

From: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>

virtio_gpu_virgl_get_num_capsets will return "num_capsets", but we can't
assume that capset_index 1 is always VIRGL2 once we'll support more capsets,
like Venus and DRM capsets. Register capsets dynamically to avoid that problem.

Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-virgl.c  | 34 +++++++++++++++++++++++-----------
 include/hw/virtio/virtio-gpu.h |  2 ++
 2 files changed, 25 insertions(+), 11 deletions(-)

diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index de788df155bf..9aa1fd78f1e1 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -597,19 +597,13 @@ static void virgl_cmd_get_capset_info(VirtIOGPU *g,
     VIRTIO_GPU_FILL_CMD(info);
 
     memset(&resp, 0, sizeof(resp));
-    if (info.capset_index == 0) {
-        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
-        virgl_renderer_get_cap_set(resp.capset_id,
-                                   &resp.capset_max_version,
-                                   &resp.capset_max_size);
-    } else if (info.capset_index == 1) {
-        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL2;
+
+    if (info.capset_index < g->capset_ids->len) {
+        resp.capset_id = g_array_index(g->capset_ids, uint32_t,
+                                       info.capset_index);
         virgl_renderer_get_cap_set(resp.capset_id,
                                    &resp.capset_max_version,
                                    &resp.capset_max_size);
-    } else {
-        resp.capset_max_version = 0;
-        resp.capset_max_size = 0;
     }
     resp.hdr.type = VIRTIO_GPU_RESP_OK_CAPSET_INFO;
     virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
@@ -1159,12 +1153,30 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
     return 0;
 }
 
+static void virtio_gpu_virgl_add_capset(VirtIOGPU *g, uint32_t capset_id)
+{
+    g_array_append_val(g->capset_ids, capset_id);
+}
+
 int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
 {
     uint32_t capset2_max_ver, capset2_max_size;
+
+    if (g->capset_ids) {
+        return g->capset_ids->len;
+    }
+
+    g->capset_ids = g_array_new(false, false, sizeof(uint32_t));
+
+    /* VIRGL is always supported. */
+    virtio_gpu_virgl_add_capset(g, VIRTIO_GPU_CAPSET_VIRGL);
+
     virgl_renderer_get_cap_set(VIRTIO_GPU_CAPSET_VIRGL2,
                               &capset2_max_ver,
                               &capset2_max_size);
+    if (capset2_max_ver) {
+        virtio_gpu_virgl_add_capset(g, VIRTIO_GPU_CAPSET_VIRGL2);
+    }
 
-    return capset2_max_ver ? 2 : 1;
+    return g->capset_ids->len;
 }
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index dc24360656ce..32f38d86c908 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -211,6 +211,8 @@ struct VirtIOGPU {
         QTAILQ_HEAD(, VGPUDMABuf) bufs;
         VGPUDMABuf *primary[VIRTIO_GPU_MAX_SCANOUTS];
     } dmabuf;
+
+    GArray *capset_ids;
 };
 
 struct VirtIOGPUClass {
-- 
2.44.0

[PATCH v9 10/11] virtio-gpu: Support Venus context

[Dmitry Osipenko]

From: Antonio Caggiano <antonio.caggiano@collabora.com>

Request Venus when initializing VirGL and if vulkan=true flag is set for
virtio-gpu device.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 hw/display/virtio-gpu-gl.c     |  2 ++
 hw/display/virtio-gpu-virgl.c  | 22 ++++++++++++++++++----
 hw/display/virtio-gpu.c        | 13 +++++++++++++
 include/hw/virtio/virtio-gpu.h |  3 +++
 meson.build                    |  1 +
 5 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c
index a8892bcc5346..8e475d28f857 100644
--- a/hw/display/virtio-gpu-gl.c
+++ b/hw/display/virtio-gpu-gl.c
@@ -138,6 +138,8 @@ static void virtio_gpu_gl_device_realize(DeviceState *qdev, Error **errp)
 static Property virtio_gpu_gl_properties[] = {
     DEFINE_PROP_BIT("stats", VirtIOGPU, parent_obj.conf.flags,
                     VIRTIO_GPU_FLAG_STATS_ENABLED, false),
+    DEFINE_PROP_BIT("vulkan", VirtIOGPU, parent_obj.conf.flags,
+                    VIRTIO_GPU_FLAG_VENUS_ENABLED, false),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
index 9aa1fd78f1e1..969272315c2a 100644
--- a/hw/display/virtio-gpu-virgl.c
+++ b/hw/display/virtio-gpu-virgl.c
@@ -1135,6 +1135,11 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
         flags |= VIRGL_RENDERER_D3D11_SHARE_TEXTURE;
     }
 #endif
+#ifdef VIRGL_RENDERER_VENUS
+    if (virtio_gpu_venus_enabled(g->parent_obj.conf)) {
+        flags |= VIRGL_RENDERER_VENUS | VIRGL_RENDERER_RENDER_SERVER;
+    }
+#endif
 
     ret = virgl_renderer_init(g, flags, &virtio_gpu_3d_cbs);
     if (ret != 0) {
@@ -1160,7 +1165,7 @@ static void virtio_gpu_virgl_add_capset(VirtIOGPU *g, uint32_t capset_id)
 
 int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
 {
-    uint32_t capset2_max_ver, capset2_max_size;
+    uint32_t capset_max_ver, capset_max_size;
 
     if (g->capset_ids) {
         return g->capset_ids->len;
@@ -1172,11 +1177,20 @@ int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
     virtio_gpu_virgl_add_capset(g, VIRTIO_GPU_CAPSET_VIRGL);
 
     virgl_renderer_get_cap_set(VIRTIO_GPU_CAPSET_VIRGL2,
-                              &capset2_max_ver,
-                              &capset2_max_size);
-    if (capset2_max_ver) {
+                               &capset_max_ver,
+                               &capset_max_size);
+    if (capset_max_ver) {
         virtio_gpu_virgl_add_capset(g, VIRTIO_GPU_CAPSET_VIRGL2);
     }
 
+    if (virtio_gpu_venus_enabled(g->parent_obj.conf)) {
+        virgl_renderer_get_cap_set(VIRTIO_GPU_CAPSET_VENUS,
+                                   &capset_max_ver,
+                                   &capset_max_size);
+        if (capset_max_size) {
+            virtio_gpu_virgl_add_capset(g, VIRTIO_GPU_CAPSET_VENUS);
+        }
+    }
+
     return g->capset_ids->len;
 }
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index 45c1f2006712..e86326b25a72 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1491,6 +1491,19 @@ void virtio_gpu_device_realize(DeviceState *qdev, Error **errp)
 #endif
     }
 
+    if (virtio_gpu_venus_enabled(g->parent_obj.conf)) {
+#ifdef HAVE_VIRGL_VENUS
+        if (!virtio_gpu_blob_enabled(g->parent_obj.conf) ||
+            !virtio_gpu_hostmem_enabled(g->parent_obj.conf)) {
+            error_setg(errp, "venus requires enabled blob and hostmem options");
+            return;
+        }
+#else
+        error_setg(errp, "old virglrenderer, venus unsupported");
+        return;
+#endif
+    }
+
     if (!virtio_gpu_base_device_realize(qdev,
                                         virtio_gpu_handle_ctrl_cb,
                                         virtio_gpu_handle_cursor_cb,
diff --git a/include/hw/virtio/virtio-gpu.h b/include/hw/virtio/virtio-gpu.h
index 32f38d86c908..7af81131499c 100644
--- a/include/hw/virtio/virtio-gpu.h
+++ b/include/hw/virtio/virtio-gpu.h
@@ -99,6 +99,7 @@ enum virtio_gpu_base_conf_flags {
     VIRTIO_GPU_FLAG_BLOB_ENABLED,
     VIRTIO_GPU_FLAG_CONTEXT_INIT_ENABLED,
     VIRTIO_GPU_FLAG_RUTABAGA_ENABLED,
+    VIRTIO_GPU_FLAG_VENUS_ENABLED,
 };
 
 #define virtio_gpu_virgl_enabled(_cfg) \
@@ -117,6 +118,8 @@ enum virtio_gpu_base_conf_flags {
     (_cfg.flags & (1 << VIRTIO_GPU_FLAG_RUTABAGA_ENABLED))
 #define virtio_gpu_hostmem_enabled(_cfg) \
     (_cfg.hostmem > 0)
+#define virtio_gpu_venus_enabled(_cfg) \
+    (_cfg.flags & (1 << VIRTIO_GPU_FLAG_VENUS_ENABLED))
 
 struct virtio_gpu_base_conf {
     uint32_t max_outputs;
diff --git a/meson.build b/meson.build
index 5ef50811b6ba..4e03349c9d10 100644
--- a/meson.build
+++ b/meson.build
@@ -2290,6 +2290,7 @@ if virgl.version().version_compare('>=1.0.0')
   config_host_data.set('HAVE_VIRGL_D3D_INFO_EXT', 1)
   config_host_data.set('HAVE_VIRGL_CONTEXT_CREATE_WITH_FLAGS', 1)
   config_host_data.set('HAVE_VIRGL_RESOURCE_BLOB', 1)
+  config_host_data.set('HAVE_VIRGL_VENUS', 1)
 endif
 config_host_data.set('CONFIG_VIRTFS', have_virtfs)
 config_host_data.set('CONFIG_VTE', vte.found())
-- 
2.44.0

[PATCH v9 11/11] migration/virtio: Add virtio-gpu section

[Dmitry Osipenko]

Document virtio-gpu migration specifics.

Suggested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
 docs/devel/migration/virtio.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/devel/migration/virtio.rst b/docs/devel/migration/virtio.rst
index 611a18b82151..67f5fcfed196 100644
--- a/docs/devel/migration/virtio.rst
+++ b/docs/devel/migration/virtio.rst
@@ -113,3 +113,10 @@ virtio_load() returned (like e.g. code depending on features).
 Any extension of the state being migrated should be done in subsections
 added to the core for compatibility reasons. If transport or device specific
 state is added, core needs to invoke a callback from the new subsection.
+
+VirtIO-GPU migration
+====================
+VirtIO-GPU doesn't adhere to a common virtio migration scheme. It doesn't
+support save/loading of virtio device state, instead it uses generic device
+migration management on top of the virtio core to save/load GPU state.
+Migration of virgl and rutabaga states not supported.
-- 
2.44.0

Re: [PATCH v9 07/11] virtio-gpu: Handle resource blob commands

[Akihiko Odaki]

On 2024/04/26 0:45, Dmitry Osipenko wrote:
> From: Antonio Caggiano <antonio.caggiano@collabora.com>
> 
> Support BLOB resources creation, mapping and unmapping by calling the
> new stable virglrenderer 0.10 interface. Only enabled when available and
> via the blob config. E.g. -device virtio-vga-gl,blob=true
> 
> Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
> Signed-off-by: Xenia Ragiadakou <xenia.ragiadakou@amd.com>
> Signed-off-by: Huang Rui <ray.huang@amd.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> ---
>   hw/display/virtio-gpu-virgl.c | 268 ++++++++++++++++++++++++++++++++++
>   hw/display/virtio-gpu.c       |   4 +-
>   2 files changed, 271 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
> index 0feaa9f2c52e..73d4acbf1777 100644
> --- a/hw/display/virtio-gpu-virgl.c
> +++ b/hw/display/virtio-gpu-virgl.c
> @@ -26,6 +26,8 @@
>   
>   struct virtio_gpu_virgl_resource {
>       struct virtio_gpu_simple_resource base;
> +    bool async_unmap_in_progress;

Why is this flag needed?

> +    MemoryRegion *mr;
>   };
>   
>   static struct virtio_gpu_virgl_resource *
> @@ -49,6 +51,120 @@ virgl_get_egl_display(G_GNUC_UNUSED void *cookie)
>   }
>   #endif
>   
> +#ifdef HAVE_VIRGL_RESOURCE_BLOB
> +struct virtio_gpu_virgl_hostmem_region {
> +    MemoryRegion mr;
> +    struct VirtIOGPU *g;
> +    struct virtio_gpu_virgl_resource *res;
> +};
> +
> +static void virtio_gpu_virgl_resume_cmdq(void *opaque)
> +{
> +    VirtIOGPU *g = opaque;
> +
> +    virtio_gpu_process_cmdq(g);
> +}
> +
> +static void virtio_gpu_virgl_hostmem_region_free(void *obj)
> +{
> +    MemoryRegion *mr = MEMORY_REGION(obj);
> +    struct virtio_gpu_virgl_hostmem_region *vmr;
> +    VirtIOGPUBase *b;
> +
> +    vmr = container_of(mr, struct virtio_gpu_virgl_hostmem_region, mr);
> +    vmr->res->async_unmap_in_progress = false;
> +
> +    b = VIRTIO_GPU_BASE(vmr->g);
> +    b->renderer_blocked--;
> +
> +    /*
> +     * memory_region_unref() may be executed from RCU thread context, while
> +     * virglrenderer works only on the main-loop thread that's holding GL
> +     * context.
> +     */
> +    aio_bh_schedule_oneshot(qemu_get_aio_context(),
> +                            virtio_gpu_virgl_resume_cmdq, vmr->g);

Use aio_bh_new() and qemu_bh_schedule() instead to save one-time bottom 
half allocation.

> +    g_free(vmr);
> +}
> +
> +static int
> +virtio_gpu_virgl_map_resource_blob(VirtIOGPU *g,
> +                                   struct virtio_gpu_virgl_resource *res,
> +                                   uint64_t offset)
> +{
> +    struct virtio_gpu_virgl_hostmem_region *vmr;
> +    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
> +    MemoryRegion *mr;
> +    uint64_t size;
> +    void *data;
> +    int ret;
> +
> +    if (!virtio_gpu_hostmem_enabled(b->conf)) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: hostmem disabled\n", __func__);
> +        return -EOPNOTSUPP; > +    }
> +
> +    ret = virgl_renderer_resource_map(res->base.resource_id, &data, &size);
> +    if (ret) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: failed to map virgl resource\n",
> +                      __func__);

Print strerror(-ret) here instead as printing strerror(EOPNOTSUPP) helps 
little when !virtio_gpu_hostmem_enabled(b->conf).

> +        return -ret;
> +    }
> +
> +    vmr = g_new0(struct virtio_gpu_virgl_hostmem_region, 1);
> +    vmr->res = res;
> +    vmr->g = g;
> +
> +    mr = &vmr->mr;
> +    memory_region_init_ram_ptr(mr, OBJECT(mr), "blob", size, data);
> +    memory_region_add_subregion(&b->hostmem, offset, mr);
> +    memory_region_set_enabled(mr, true);
> +
> +    /*
> +     * Potentially, MR could outlive the resource if MR's reference is held
> +     * outside of virtio-gpu. In order to prevent unmapping resource while
> +     * MR is alive, and thus, making the data pointer invalid, we will block
> +     * virtio-gpu command processing until MR is fully unreferenced and
> +     * released.
> +     */
> +    OBJECT(mr)->free = virtio_gpu_virgl_hostmem_region_free;
> +
> +    res->mr = mr;
> +
> +    return 0;
> +}
> +
> +static bool
> +virtio_gpu_virgl_unmap_resource_blob(VirtIOGPU *g,
> +                                     struct virtio_gpu_virgl_resource *res)
> +{
> +    VirtIOGPUBase *b = VIRTIO_GPU_BASE(g);
> +
> +    if (!res->async_unmap_in_progress && res->mr) {
> +        /* memory region owns self res->mr object and frees it by itself */
> +        MemoryRegion *mr = res->mr;
> +        res->mr = NULL;
> +
> +        res->async_unmap_in_progress = true;
> +
> +        /* render will be unblocked when MR is freed */
> +        b->renderer_blocked++;
> +
> +        memory_region_set_enabled(mr, false);
> +        memory_region_del_subregion(&b->hostmem, mr);
> +        object_unparent(OBJECT(mr));
> +    }
> +
> +    if (res->async_unmap_in_progress) {
> +        return false;
> +    }
> +
> +    virgl_renderer_resource_unmap(res->base.resource_id);
> +
> +    return true;
> +}
> +#endif /* HAVE_VIRGL_RESOURCE_BLOB */
> +
>   static void virgl_cmd_create_resource_2d(VirtIOGPU *g,
>                                            struct virtio_gpu_ctrl_command *cmd)
>   {
> @@ -162,6 +278,14 @@ static void virgl_cmd_resource_unref(VirtIOGPU *g,
>           return;
>       }
>   
> +    if (res->mr || cmd->suspended) {
> +        bool unmapped = virtio_gpu_virgl_unmap_resource_blob(g, res);
> +        cmd->suspended = !unmapped;
> +        if (cmd->suspended) {
> +            return;
> +        }
> +    }
> +
>       virgl_renderer_resource_detach_iov(unref.resource_id,
>                                          &res_iovs,
>                                          &num_iovs);
> @@ -512,6 +636,141 @@ static void virgl_cmd_get_capset(VirtIOGPU *g,
>   }
>   
>   #ifdef HAVE_VIRGL_RESOURCE_BLOB
> +static void virgl_cmd_resource_create_blob(VirtIOGPU *g,
> +                                           struct virtio_gpu_ctrl_command *cmd)
> +{
> +    struct virgl_renderer_resource_create_blob_args virgl_args = { 0 };
> +    struct virtio_gpu_resource_create_blob cblob;
> +    struct virtio_gpu_virgl_resource *res;
> +    int ret;
> +
> +    if (!virtio_gpu_blob_enabled(g->parent_obj.conf)) {
> +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER;
> +        return;
> +    }
> +
> +    VIRTIO_GPU_FILL_CMD(cblob);
> +    virtio_gpu_create_blob_bswap(&cblob);
> +    trace_virtio_gpu_cmd_res_create_blob(cblob.resource_id, cblob.size);
> +
> +    if (cblob.resource_id == 0) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource id 0 is not allowed\n",
> +                      __func__);
> +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> +        return;
> +    }
> +
> +    res = virtio_gpu_virgl_find_resource(g, cblob.resource_id);
> +    if (res) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already exists %d\n",
> +                      __func__, cblob.resource_id);
> +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> +        return;
> +    }
> +
> +    res = g_new0(struct virtio_gpu_virgl_resource, 1);
> +    res->base.resource_id = cblob.resource_id;
> +    res->base.blob_size = cblob.size;
> +    res->base.dmabuf_fd = -1;
> +
> +    if (cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) {
> +        ret = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, sizeof(cblob),
> +                                            cmd, &res->base.addrs,
> +                                            &res->base.iov, &res->base.iov_cnt);
> +        if (!ret) {
> +            g_free(res);
> +            cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> +            return;
> +        }
> +    }
> +
> +    QTAILQ_INSERT_HEAD(&g->reslist, &res->base, next);
> +
> +    virgl_args.res_handle = cblob.resource_id;
> +    virgl_args.ctx_id = cblob.hdr.ctx_id;
> +    virgl_args.blob_mem = cblob.blob_mem;
> +    virgl_args.blob_id = cblob.blob_id;
> +    virgl_args.blob_flags = cblob.blob_flags;
> +    virgl_args.size = cblob.size;
> +    virgl_args.iovecs = res->base.iov;
> +    virgl_args.num_iovs = res->base.iov_cnt;
> +
> +    ret = virgl_renderer_resource_create_blob(&virgl_args);
> +    if (ret) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: virgl blob create error: %s\n",
> +                      __func__, strerror(-ret));
> +        cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC;
> +    }
> +}
> +
> +static void virgl_cmd_resource_map_blob(VirtIOGPU *g,
> +                                        struct virtio_gpu_ctrl_command *cmd)
> +{
> +    struct virtio_gpu_resource_map_blob mblob;
> +    struct virtio_gpu_virgl_resource *res;
> +    struct virtio_gpu_resp_map_info resp;
> +    int ret;
> +
> +    VIRTIO_GPU_FILL_CMD(mblob);
> +    virtio_gpu_map_blob_bswap(&mblob);
> +
> +    res = virtio_gpu_virgl_find_resource(g, mblob.resource_id);
> +    if (!res) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource does not exist %d\n",
> +                      __func__, mblob.resource_id);
> +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> +        return;
> +    }
> +
> +    if (res->mr) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource already mapped %d\n",
> +                      __func__, mblob.resource_id);
> +        cmd->error = VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID;
> +        return;
> +    }
> +
> +    ret = virtio_gpu_virgl_map_resource_blob(g, res, mblob.offset);
> +    if (ret) {
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: resource map error: %s\n",
> +                      __func__, strerror(ret));
> +        cmd->error = VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY;

I think it's better to use VIRTIO_GPU_RESP_ERR_UNSPEC here; we don't 
know if the error is out-of-memory or something else.

Re: [PATCH v9 08/11] virtio-gpu: Resource UUID

[Akihiko Odaki]

On 2024/04/26 0:45, Dmitry Osipenko wrote:
> From: Antonio Caggiano <antonio.caggiano@collabora.com>
> 
> Enable resource UUID feature and implement command resource assign UUID.
> UUID feature availability is mandatory for Vulkan Venus context.
> 
> UUID is intended for sharing dmabufs between virtio devices on host. Qemu
> doesn't have second virtio device for sharing, thus a simple stub UUID
> implementation is enough. More complete implementation using global UUID
> resource table might become interesting for a multi-gpu cases.

This message needs to be updated to clarify that a VM can have a second 
virtio-gpu device but this implementation does not support sharing 
between two virtio-gpu devices.

Re: [PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Akihiko Odaki]

On 2024/04/26 0:45, Dmitry Osipenko wrote:
> From: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
> 
> virtio_gpu_virgl_get_num_capsets will return "num_capsets", but we can't
> assume that capset_index 1 is always VIRGL2 once we'll support more capsets,
> like Venus and DRM capsets. Register capsets dynamically to avoid that problem.
> 
> Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> ---
>   hw/display/virtio-gpu-virgl.c  | 34 +++++++++++++++++++++++-----------
>   include/hw/virtio/virtio-gpu.h |  2 ++
>   2 files changed, 25 insertions(+), 11 deletions(-)
> 
> diff --git a/hw/display/virtio-gpu-virgl.c b/hw/display/virtio-gpu-virgl.c
> index de788df155bf..9aa1fd78f1e1 100644
> --- a/hw/display/virtio-gpu-virgl.c
> +++ b/hw/display/virtio-gpu-virgl.c
> @@ -597,19 +597,13 @@ static void virgl_cmd_get_capset_info(VirtIOGPU *g,
>       VIRTIO_GPU_FILL_CMD(info);
>   
>       memset(&resp, 0, sizeof(resp));
> -    if (info.capset_index == 0) {
> -        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL;
> -        virgl_renderer_get_cap_set(resp.capset_id,
> -                                   &resp.capset_max_version,
> -                                   &resp.capset_max_size);
> -    } else if (info.capset_index == 1) {
> -        resp.capset_id = VIRTIO_GPU_CAPSET_VIRGL2;
> +
> +    if (info.capset_index < g->capset_ids->len) {
> +        resp.capset_id = g_array_index(g->capset_ids, uint32_t,
> +                                       info.capset_index);
>           virgl_renderer_get_cap_set(resp.capset_id,
>                                      &resp.capset_max_version,
>                                      &resp.capset_max_size);
> -    } else {
> -        resp.capset_max_version = 0;
> -        resp.capset_max_size = 0;
>       }
>       resp.hdr.type = VIRTIO_GPU_RESP_OK_CAPSET_INFO;
>       virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp));
> @@ -1159,12 +1153,30 @@ int virtio_gpu_virgl_init(VirtIOGPU *g)
>       return 0;
>   }
>   
> +static void virtio_gpu_virgl_add_capset(VirtIOGPU *g, uint32_t capset_id)
> +{
> +    g_array_append_val(g->capset_ids, capset_id);
> +}
> +
>   int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
>   {
>       uint32_t capset2_max_ver, capset2_max_size;
> +
> +    if (g->capset_ids) {

Move capset_ids initialization to virtio_gpu_virgl_init() to save this 
conditional. capset_ids also needs to be freed when the device gets 
unrealized.

Re: [PATCH v9 11/11] migration/virtio: Add virtio-gpu section

[Akihiko Odaki]

On 2024/04/26 0:45, Dmitry Osipenko wrote:
> Document virtio-gpu migration specifics.
> 
> Suggested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
> ---
>   docs/devel/migration/virtio.rst | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/docs/devel/migration/virtio.rst b/docs/devel/migration/virtio.rst
> index 611a18b82151..67f5fcfed196 100644
> --- a/docs/devel/migration/virtio.rst
> +++ b/docs/devel/migration/virtio.rst
> @@ -113,3 +113,10 @@ virtio_load() returned (like e.g. code depending on features).
>   Any extension of the state being migrated should be done in subsections
>   added to the core for compatibility reasons. If transport or device specific
>   state is added, core needs to invoke a callback from the new subsection.
> +
> +VirtIO-GPU migration
> +====================
> +VirtIO-GPU doesn't adhere to a common virtio migration scheme. It doesn't
> +support save/loading of virtio device state, instead it uses generic device
> +migration management on top of the virtio core to save/load GPU state.
> +Migration of virgl and rutabaga states not supported.

Sorry for confusion, but I didn't mean to add a subsection to the 
documentation. I intended to refer to a terminology of migration data 
structure named subsection, which is documented at: 
docs/devel/migration/main.rst

A device-specific information is not worth to describe here.

Re: [PATCH v9 10/11] virtio-gpu: Support Venus context

[Akihiko Odaki]

On 2024/04/26 0:45, Dmitry Osipenko wrote:
> From: Antonio Caggiano <antonio.caggiano@collabora.com>
> 
> Request Venus when initializing VirGL and if vulkan=true flag is set for
> virtio-gpu device.

Naming it vulkan is a bit confusing as there is also GFXSTREAM_VULKAN 
capset though virgl does not support it. I think you can just name it venus.

Re: [PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Dmitry Osipenko]

On 4/27/24 10:12, Akihiko Odaki wrote:
>>   int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
>>   {
>>       uint32_t capset2_max_ver, capset2_max_size;
>> +
>> +    if (g->capset_ids) {
> 
> Move capset_ids initialization to virtio_gpu_virgl_init() to save this
> conditional.

Capsets are used before virgl is inited. At first guest queries virtio
device features and then enables virgl only if capset is available.
While virgl itself is initialized when first virtio command is
processed. I.e. it's not possible to move to virtio_gpu_virgl_init.

> capset_ids also needs to be freed when the device gets
> unrealized.

ACK

-- 
Best regards,
Dmitry

Re: [PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Dmitry Osipenko]

On 5/1/24 22:31, Dmitry Osipenko wrote:
> On 4/27/24 10:12, Akihiko Odaki wrote:
>>>   int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
>>>   {
>>>       uint32_t capset2_max_ver, capset2_max_size;
>>> +
>>> +    if (g->capset_ids) {
>>
>> Move capset_ids initialization to virtio_gpu_virgl_init() to save this
>> conditional.
> 
> Capsets are used before virgl is inited. At first guest queries virtio
> device features and then enables virgl only if capset is available.
> While virgl itself is initialized when first virtio command is
> processed. I.e. it's not possible to move to virtio_gpu_virgl_init.

Though no, capsets aren't part of device features. I'll move it to
virtio_gpu_virgl_init, thanks.

-- 
Best regards,
Dmitry

Re: [PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Dmitry Osipenko]

On 5/1/24 22:38, Dmitry Osipenko wrote:
> On 5/1/24 22:31, Dmitry Osipenko wrote:
>> On 4/27/24 10:12, Akihiko Odaki wrote:
>>>>   int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
>>>>   {
>>>>       uint32_t capset2_max_ver, capset2_max_size;
>>>> +
>>>> +    if (g->capset_ids) {
>>>
>>> Move capset_ids initialization to virtio_gpu_virgl_init() to save this
>>> conditional.
>>
>> Capsets are used before virgl is inited. At first guest queries virtio
>> device features and then enables virgl only if capset is available.
>> While virgl itself is initialized when first virtio command is
>> processed. I.e. it's not possible to move to virtio_gpu_virgl_init.
> 
> Though no, capsets aren't part of device features. I'll move it to
> virtio_gpu_virgl_init, thanks.
> 

Number of capsets actually is a part of generic virtio device cfg
descriptor. Capsets initialization can't be moved without probing
capsets twice, i.e. not worthwhile.

-- 
Best regards,
Dmitry

Re: [PATCH v9 09/11] virtio-gpu: Register capsets dynamically

[Akihiko Odaki]

On 2024/05/02 4:52, Dmitry Osipenko wrote:
> On 5/1/24 22:38, Dmitry Osipenko wrote:
>> On 5/1/24 22:31, Dmitry Osipenko wrote:
>>> On 4/27/24 10:12, Akihiko Odaki wrote:
>>>>>    int virtio_gpu_virgl_get_num_capsets(VirtIOGPU *g)
>>>>>    {
>>>>>        uint32_t capset2_max_ver, capset2_max_size;
>>>>> +
>>>>> +    if (g->capset_ids) {
>>>>
>>>> Move capset_ids initialization to virtio_gpu_virgl_init() to save this
>>>> conditional.
>>>
>>> Capsets are used before virgl is inited. At first guest queries virtio
>>> device features and then enables virgl only if capset is available.
>>> While virgl itself is initialized when first virtio command is
>>> processed. I.e. it's not possible to move to virtio_gpu_virgl_init.
>>
>> Though no, capsets aren't part of device features. I'll move it to
>> virtio_gpu_virgl_init, thanks.
>>
> 
> Number of capsets actually is a part of generic virtio device cfg
> descriptor. Capsets initialization can't be moved without probing
> capsets twice, i.e. not worthwhile.
> 

I see. Then I suggest replacing virtio_gpu_virgl_get_num_capsets() with 
a function that returns GArray of capset IDs. 
virtio_gpu_gl_device_realize() will assign the returned GArray to 
g->capset_ids. virtio_gpu_gl_device_unrealize(), which doesn't exist 
yet, will free g->capset_ids later.

This way, you won't need the conditional, and it will be clear that a 
GArray allocation happens in virtio_gpu_gl_device_realize() and is 
matched with the deallocation in virtio_gpu_gl_device_unrealize().