|
| From: | Thomas Huth |
| Subject: | Re: [PATCH v11 6/9] gfxstream + rutabaga: add initial support for gfxstream |
| Date: | Wed, 27 Sep 2023 13:34:48 +0200 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 |
On 19/09/2023 20.36, Bernhard Beschow wrote:
Am 15. September 2023 02:38:02 UTC schrieb Gurchetan Singh <gurchetansingh@chromium.org>:On Thu, Sep 14, 2023 at 12:23 AM Bernhard Beschow <shentey@gmail.com> wrote:Am 14. September 2023 04:38:51 UTC schrieb Gurchetan Singh < gurchetansingh@chromium.org>:On Wed, Sep 13, 2023 at 4:58 AM Bernhard Beschow <shentey@gmail.com>wrote:Am 23. August 2023 01:25:38 UTC schrieb Gurchetan Singh < gurchetansingh@chromium.org>:This adds initial support for gfxstream and cross-domain. Both features rely on virtio-gpu blob resources and context types, which are also implemented in this patch. gfxstream has a long and illustrious history in Android graphics paravirtualization. It has been powering graphics in the Android Studio Emulator for more than a decade, which is the main developer platform. Originally conceived by Jesse Hall, it was first known as "EmuGL" [a]. The key design characteristic was a 1:1 threading model and auto-generation, which fit nicely with the OpenGLES spec. It also allowed easy layering with ANGLE on the host, which provides the GLES implementations on Windows or MacOS enviroments. gfxstream has traditionally been maintained by a single engineer, and between 2015 to 2021, the goldfish throne passed to Frank Yang. Historians often remark this glorious reign ("pax gfxstreama" is the academic term) was comparable to that of Augustus and both Queen Elizabeths. Just to name a few accomplishments in a resplendent panoply: higher versions of GLES, address space graphics, snapshot support and CTS compliant Vulkan [b]. One major drawback was the use of out-of-tree goldfish drivers. Android engineers didn't know much about DRM/KMS and especially TTM so a simple guest to host pipe was conceived. Luckily, virtio-gpu 3D started to emerge in 2016 due to the work of the Mesa/virglrenderer communities. In 2018, the initial virtio-gpu port of gfxstream was done by Cuttlefish enthusiast Alistair Delva. It was a symbol compatible replacement of virglrenderer [c] and named "AVDVirglrenderer". This implementation forms the basis of the current gfxstream host implementation still in use today. cross-domain support follows a similar arc. Originally conceived by Wayland aficionado David Reveman and crosvm enjoyer Zach Reizner in 2018, it initially relied on the downstream "virtio-wl" device. In 2020 and 2021, virtio-gpu was extended to include blob resources and multiple timelines by yours truly, features gfxstream/cross-domain both require to function correctly. Right now, we stand at the precipice of a truly fantastic possibility: the Android Emulator powered by upstream QEMU and upstream Linux kernel. gfxstream will then be packaged properfully, and app developers can even fix gfxstream bugs on their own if they encounter them. It's been quite the ride, my friends. Where will gfxstream head next, nobody really knows. I wouldn't be surprised if it's around for another decade, maintained by a new generation of Android graphics enthusiasts. Technical details: - Very simple initial display integration: just used Pixman - Largely, 1:1 mapping of virtio-gpu hypercalls to rutabaga function calls Next steps for Android VMs: - The next step would be improving display integration and UIinterfaceswith the goal of the QEMU upstream graphics being in an emulator release [d]. Next steps for Linux VMs for display virtualization: - For widespread distribution, someone needs to package Sommelier orthewayland-proxy-virtwl [e] ideally into Debian main. In addition,newerversions of the Linux kernel come with DRM_VIRTIO_GPU_KMS option, which allows disabling KMS hypercalls. If anyone cares enough,it'llprobably be possible to build a custom VM variant that uses thisdisplayvirtualization strategy. [a]https://android-review.googlesource.com/c/platform/development/+/34470[b]https://android-review.googlesource.com/q/topic:%22vulkan-hostconnection-start%22[c]https://android-review.googlesource.com/c/device/generic/goldfish-opengl/+/761927[d] https://developer.android.com/studio/releases/emulator [e] https://github.com/talex5/wayland-proxy-virtwl Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org> Tested-by: Alyssa Ross <hi@alyssa.is> Tested-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org> Reviewed-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org> --- v1: Incorported various suggestions by Akihiko Odaki and BernardBerschow- Removed GET_VIRTIO_GPU_GL / GET_RUTABAGA macros - Used error_report(..) - Used g_autofree to fix leaks on error paths - Removed unnecessary casts - added virtio-gpu-pci-rutabaga.c + virtio-vga-rutabaga.c files v2: Incorported various suggestions by Akihiko Odaki, Marc-André LureauandBernard Berschow: - Parenthesis in CHECK macro - CHECK_RESULT(result, ..) --> CHECK(!result, ..) - delay until g->parent_obj.enable = 1 - Additional cast fixes - initialize directly in virtio_gpu_rutabaga_realize(..) - add debug callback to hook into QEMU error's APIs v3: Incorporated feedback from Akihiko Odaki and Alyssa Ross: - Autodetect Wayland socket when not explicitly specified - Fix map_blob error paths - Add comment why we need both `res` and `resource` in create blob - Cast and whitespace fixes - Big endian check comes before virtio_gpu_rutabaga_init(). - VirtIOVGARUTABAGA --> VirtIOVGARutabaga v4: Incorporated feedback from Akihiko Odaki and Alyssa Ross: - Double checked all casts - Remove unnecessary parenthesis - Removed `resource` in create_blob - Added comment about failure case - Pass user-provided socket as-is - Use stack variable rather than heap allocation - Future-proofed map info API to give access flags as well v5: Incorporated feedback from Akihiko Odaki: - Check (ss.scanout_id < VIRTIO_GPU_MAX_SCANOUTS) - Simplify num_capsets check - Call cleanup mapping on error paths - uint64_t --> void* for rutabaga_map(..) - Removed unnecessary parenthesis - Removed unnecessary cast - #define UNIX_PATH_MAX sizeof((struct sockaddr_un) {}.sun_path) - Reuse result variable v6: Incorporated feedback from Akihiko Odaki: - Remove unnecessary #ifndef - Disable scanout when appropriate - CHECK capset index within range outside loop - Add capset_version v7: Incorporated feedback from Akihiko Odaki: - aio_bh_schedule_oneshot_full --> aio_bh_schedule_oneshot v9: Incorportated feedback from Akihiko Odaki: - Remove extra error_setg(..) after virtio_gpu_rutabaga_init(..) - Add error_setg(..) after rutabaga_init(..) v10: Incorportated feedback from Akihiko Odaki: - error_setg(..) --> error_setg_errno(..) when appropriate - virtio_gpu_rutabaga_init returns a bool instead of an int v11: Incorportated feedback from Philippe Mathieu-Daudé: - C-style /* */ comments and avoid // comments. - GPL-2.0 --> GPL-2.0-or-later hw/display/virtio-gpu-pci-rutabaga.c | 50 ++ hw/display/virtio-gpu-rutabaga.c | 1121 ++++++++++++++++++++++++++ hw/display/virtio-vga-rutabaga.c | 53 ++ 3 files changed, 1224 insertions(+) create mode 100644 hw/display/virtio-gpu-pci-rutabaga.c create mode 100644 hw/display/virtio-gpu-rutabaga.c create mode 100644 hw/display/virtio-vga-rutabaga.c diff --git a/hw/display/virtio-gpu-pci-rutabaga.cb/hw/display/virtio-gpu-pci-rutabaga.cnew file mode 100644 index 0000000000..311eff308a --- /dev/null +++ b/hw/display/virtio-gpu-pci-rutabaga.c @@ -0,0 +1,50 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/module.h" +#include "hw/pci/pci.h" +#include "hw/qdev-properties.h" +#include "hw/virtio/virtio.h" +#include "hw/virtio/virtio-bus.h" +#include "hw/virtio/virtio-gpu-pci.h" +#include "qom/object.h" + +#define TYPE_VIRTIO_GPU_RUTABAGA_PCI "virtio-gpu-rutabaga-pci" +typedef struct VirtIOGPURutabagaPCI VirtIOGPURutabagaPCI; +DECLARE_INSTANCE_CHECKER(VirtIOGPURutabagaPCI,VIRTIO_GPU_RUTABAGA_PCI,+ TYPE_VIRTIO_GPU_RUTABAGA_PCI) + +struct VirtIOGPURutabagaPCI { + VirtIOGPUPCIBase parent_obj; + VirtIOGPURutabaga vdev; +}; + +static void virtio_gpu_rutabaga_initfn(Object *obj) +{ + VirtIOGPURutabagaPCI *dev = VIRTIO_GPU_RUTABAGA_PCI(obj); + + virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev), + TYPE_VIRTIO_GPU_RUTABAGA); + VIRTIO_GPU_PCI_BASE(obj)->vgpu = VIRTIO_GPU_BASE(&dev->vdev); +} + +static const VirtioPCIDeviceTypeInfo virtio_gpu_rutabaga_pci_info = { + .generic_name = TYPE_VIRTIO_GPU_RUTABAGA_PCI, + .parent = TYPE_VIRTIO_GPU_PCI_BASE, + .instance_size = sizeof(VirtIOGPURutabagaPCI), + .instance_init = virtio_gpu_rutabaga_initfn, +}; +module_obj(TYPE_VIRTIO_GPU_RUTABAGA_PCI); +module_kconfig(VIRTIO_PCI); + +static void virtio_gpu_rutabaga_pci_register_types(void) +{ + virtio_pci_types_register(&virtio_gpu_rutabaga_pci_info); +} + +type_init(virtio_gpu_rutabaga_pci_register_types) + +module_dep("hw-display-virtio-gpu-pci"); diff --git a/hw/display/virtio-gpu-rutabaga.cb/hw/display/virtio-gpu-rutabaga.cnew file mode 100644 index 0000000000..9018e5a702 --- /dev/null +++ b/hw/display/virtio-gpu-rutabaga.c @@ -0,0 +1,1121 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "qemu/error-report.h" +#include "qemu/iov.h" +#include "trace.h" +#include "hw/virtio/virtio.h" +#include "hw/virtio/virtio-gpu.h" +#include "hw/virtio/virtio-gpu-pixman.h" +#include "hw/virtio/virtio-iommu.h" + +#include <glib/gmem.h> +#include <rutabaga_gfx/rutabaga_gfx_ffi.h> + +#define CHECK(condition, cmd)\+ do {\+ if (!(condition)) {\+ error_report("CHECK failed in %s() %s:" "%d", __func__,\+ __FILE__, __LINE__);\+ (cmd)->error = VIRTIO_GPU_RESP_ERR_UNSPEC;\+ return;\+ }\+ } while (0) + +/* + * This is the size of the char array in struct sock_addr_un. NoWaylandsocket+ * can be created with a path longer than this, including the nullterminator.+ */ +#define UNIX_PATH_MAX sizeof((struct sockaddr_un) {} .sun_path) + +struct rutabaga_aio_data { + struct VirtIOGPURutabaga *vr; + struct rutabaga_fence fence; +}; + +static void +virtio_gpu_rutabaga_update_cursor(VirtIOGPU *g, structvirtio_gpu_scanout *s,+ uint32_t resource_id) +{ + struct virtio_gpu_simple_resource *res; + struct rutabaga_transfer transfer = { 0 }; + struct iovec transfer_iovec; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + res = virtio_gpu_find_resource(g, resource_id); + if (!res) { + return; + } + + if (res->width != s->current_cursor->width || + res->height != s->current_cursor->height) { + return; + } + + transfer.x = 0; + transfer.y = 0; + transfer.z = 0; + transfer.w = res->width; + transfer.h = res->height; + transfer.d = 1; + + transfer_iovec.iov_base = s->current_cursor->data; + transfer_iovec.iov_len = res->width * res->height * 4; + + rutabaga_resource_transfer_read(vr->rutabaga, 0, + resource_id, &transfer, + &transfer_iovec); +} + +static void +virtio_gpu_rutabaga_gl_flushed(VirtIOGPUBase *b) +{ + VirtIOGPU *g = VIRTIO_GPU(b); + virtio_gpu_process_cmdq(g); +} + +static void +rutabaga_cmd_create_resource_2d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct rutabaga_create_3d rc_3d = { 0 }; + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_create_2d c2d; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(c2d); + trace_virtio_gpu_cmd_res_create_2d(c2d.resource_id, c2d.format, + c2d.width, c2d.height); + + rc_3d.target = 2; + rc_3d.format = c2d.format; + rc_3d.bind = (1 << 1); + rc_3d.width = c2d.width; + rc_3d.height = c2d.height; + rc_3d.depth = 1; + rc_3d.array_size = 1; + rc_3d.last_level = 0; + rc_3d.nr_samples = 0; + rc_3d.flags = VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP; + + result = rutabaga_resource_create_3d(vr->rutabaga,c2d.resource_id,&rc_3d);+ CHECK(!result, cmd); + + res = g_new0(struct virtio_gpu_simple_resource, 1); + res->width = c2d.width; + res->height = c2d.height; + res->format = c2d.format; + res->resource_id = c2d.resource_id; + + QTAILQ_INSERT_HEAD(&g->reslist, res, next); +} + +static void +rutabaga_cmd_create_resource_3d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct rutabaga_create_3d rc_3d = { 0 }; + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_create_3d c3d; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(c3d); + + trace_virtio_gpu_cmd_res_create_3d(c3d.resource_id, c3d.format, + c3d.width, c3d.height,c3d.depth);+ + rc_3d.target = c3d.target; + rc_3d.format = c3d.format; + rc_3d.bind = c3d.bind; + rc_3d.width = c3d.width; + rc_3d.height = c3d.height; + rc_3d.depth = c3d.depth; + rc_3d.array_size = c3d.array_size; + rc_3d.last_level = c3d.last_level; + rc_3d.nr_samples = c3d.nr_samples; + rc_3d.flags = c3d.flags; + + result = rutabaga_resource_create_3d(vr->rutabaga,c3d.resource_id,&rc_3d);+ CHECK(!result, cmd); + + res = g_new0(struct virtio_gpu_simple_resource, 1); + res->width = c3d.width; + res->height = c3d.height; + res->format = c3d.format; + res->resource_id = c3d.resource_id; + + QTAILQ_INSERT_HEAD(&g->reslist, res, next); +} + +static void +rutabaga_cmd_resource_unref(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_unref unref; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(unref); + + trace_virtio_gpu_cmd_res_unref(unref.resource_id); + + res = virtio_gpu_find_resource(g, unref.resource_id); + CHECK(res, cmd); + + result = rutabaga_resource_unref(vr->rutabaga, unref.resource_id); + CHECK(!result, cmd); + + if (res->image) { + pixman_image_unref(res->image); + } + + QTAILQ_REMOVE(&g->reslist, res, next); + g_free(res); +} + +static void +rutabaga_cmd_context_create(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_ctx_create cc; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(cc); + trace_virtio_gpu_cmd_ctx_create(cc.hdr.ctx_id, + cc.debug_name); + + result = rutabaga_context_create(vr->rutabaga, cc.hdr.ctx_id, + cc.context_init, cc.debug_name,cc.nlen);+ CHECK(!result, cmd); +} + +static void +rutabaga_cmd_context_destroy(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_ctx_destroy cd; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(cd); + trace_virtio_gpu_cmd_ctx_destroy(cd.hdr.ctx_id); + + result = rutabaga_context_destroy(vr->rutabaga, cd.hdr.ctx_id); + CHECK(!result, cmd); +} + +static void +rutabaga_cmd_resource_flush(VirtIOGPU *g, structvirtio_gpu_ctrl_command*cmd)+{ + int32_t result, i; + struct virtio_gpu_scanout *scanout = NULL; + struct virtio_gpu_simple_resource *res; + struct rutabaga_transfer transfer = { 0 }; + struct iovec transfer_iovec; + struct virtio_gpu_resource_flush rf; + bool found = false; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + if (vr->headless) { + return; + } + + VIRTIO_GPU_FILL_CMD(rf); + trace_virtio_gpu_cmd_res_flush(rf.resource_id, + rf.r.width, rf.r.height, rf.r.x,rf.r.y);+ + res = virtio_gpu_find_resource(g, rf.resource_id); + CHECK(res, cmd); + + for (i = 0; i < g->parent_obj.conf.max_outputs; i++) { + scanout = &g->parent_obj.scanout[i]; + if (i == res->scanout_bitmask) { + found = true; + break; + } + } + + if (!found) { + return; + } + + transfer.x = 0; + transfer.y = 0; + transfer.z = 0; + transfer.w = res->width; + transfer.h = res->height; + transfer.d = 1; + + transfer_iovec.iov_base = pixman_image_get_data(res->image); + transfer_iovec.iov_len = res->width * res->height * 4; + + result = rutabaga_resource_transfer_read(vr->rutabaga, 0, + rf.resource_id,&transfer,+ &transfer_iovec); + CHECK(!result, cmd); + dpy_gfx_update_full(scanout->con); +} + +static void +rutabaga_cmd_set_scanout(VirtIOGPU *g, struct virtio_gpu_ctrl_command*cmd)+{ + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_scanout *scanout = NULL; + struct virtio_gpu_set_scanout ss; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + if (vr->headless) { + return; + } + + VIRTIO_GPU_FILL_CMD(ss); + trace_virtio_gpu_cmd_set_scanout(ss.scanout_id, ss.resource_id, + ss.r.width, ss.r.height, ss.r.x,ss.r.y);+ + CHECK(ss.scanout_id < VIRTIO_GPU_MAX_SCANOUTS, cmd); + scanout = &g->parent_obj.scanout[ss.scanout_id]; + + if (ss.resource_id == 0) { + dpy_gfx_replace_surface(scanout->con, NULL); + dpy_gl_scanout_disable(scanout->con); + return; + } + + res = virtio_gpu_find_resource(g, ss.resource_id); + CHECK(res, cmd); + + if (!res->image) { + pixman_format_code_t pformat; + pformat = virtio_gpu_get_pixman_format(res->format); + CHECK(pformat, cmd); + + res->image = pixman_image_create_bits(pformat, + res->width, + res->height, + NULL, 0); + CHECK(res->image, cmd); + pixman_image_ref(res->image); + } + + g->parent_obj.enable = 1; + + /* realloc the surface ptr */ + scanout->ds = qemu_create_displaysurface_pixman(res->image); + dpy_gfx_replace_surface(scanout->con, NULL); + dpy_gfx_replace_surface(scanout->con, scanout->ds); + res->scanout_bitmask = ss.scanout_id; +} + +static void +rutabaga_cmd_submit_3d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_cmd_submit cs; + struct rutabaga_command rutabaga_cmd = { 0 }; + g_autofree uint8_t *buf = NULL; + size_t s; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(cs); + trace_virtio_gpu_cmd_ctx_submit(cs.hdr.ctx_id, cs.size); + + buf = g_new0(uint8_t, cs.size); + s = iov_to_buf(cmd->elem.out_sg, cmd->elem.out_num, + sizeof(cs), buf, cs.size); + CHECK(s == cs.size, cmd); + + rutabaga_cmd.ctx_id = cs.hdr.ctx_id; + rutabaga_cmd.cmd = buf; + rutabaga_cmd.cmd_size = cs.size; + + result = rutabaga_submit_command(vr->rutabaga, &rutabaga_cmd); + CHECK(!result, cmd); +} + +static void +rutabaga_cmd_transfer_to_host_2d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct rutabaga_transfer transfer = { 0 }; + struct virtio_gpu_transfer_to_host_2d t2d; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(t2d); + trace_virtio_gpu_cmd_res_xfer_toh_2d(t2d.resource_id); + + transfer.x = t2d.r.x; + transfer.y = t2d.r.y; + transfer.z = 0; + transfer.w = t2d.r.width; + transfer.h = t2d.r.height; + transfer.d = 1; + + result = rutabaga_resource_transfer_write(vr->rutabaga, 0,t2d.resource_id,+ &transfer); + CHECK(!result, cmd); +} + +static void +rutabaga_cmd_transfer_to_host_3d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct rutabaga_transfer transfer = { 0 }; + struct virtio_gpu_transfer_host_3d t3d; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(t3d); + trace_virtio_gpu_cmd_res_xfer_toh_3d(t3d.resource_id); + + transfer.x = t3d.box.x; + transfer.y = t3d.box.y; + transfer.z = t3d.box.z; + transfer.w = t3d.box.w; + transfer.h = t3d.box.h; + transfer.d = t3d.box.d; + transfer.level = t3d.level; + transfer.stride = t3d.stride; + transfer.layer_stride = t3d.layer_stride; + transfer.offset = t3d.offset; + + result = rutabaga_resource_transfer_write(vr->rutabaga,t3d.hdr.ctx_id,+ t3d.resource_id,&transfer);+ CHECK(!result, cmd); +} + +static void +rutabaga_cmd_transfer_from_host_3d(VirtIOGPU *g, + struct virtio_gpu_ctrl_command*cmd)+{ + int32_t result; + struct rutabaga_transfer transfer = { 0 }; + struct virtio_gpu_transfer_host_3d t3d; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(t3d); + trace_virtio_gpu_cmd_res_xfer_fromh_3d(t3d.resource_id); + + transfer.x = t3d.box.x; + transfer.y = t3d.box.y; + transfer.z = t3d.box.z; + transfer.w = t3d.box.w; + transfer.h = t3d.box.h; + transfer.d = t3d.box.d; + transfer.level = t3d.level; + transfer.stride = t3d.stride; + transfer.layer_stride = t3d.layer_stride; + transfer.offset = t3d.offset; + + result = rutabaga_resource_transfer_read(vr->rutabaga,t3d.hdr.ctx_id,+ t3d.resource_id,&transfer,NULL);+ CHECK(!result, cmd); +} + +static void +rutabaga_cmd_attach_backing(VirtIOGPU *g, structvirtio_gpu_ctrl_command*cmd)+{ + struct rutabaga_iovecs vecs = { 0 }; + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_attach_backing att_rb; + int ret; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(att_rb); + trace_virtio_gpu_cmd_res_back_attach(att_rb.resource_id); + + res = virtio_gpu_find_resource(g, att_rb.resource_id); + CHECK(res, cmd); + CHECK(!res->iov, cmd); + + ret = virtio_gpu_create_mapping_iov(g, att_rb.nr_entries,sizeof(att_rb),+ cmd, NULL, &res->iov,&res->iov_cnt);+ CHECK(!ret, cmd); + + vecs.iovecs = res->iov; + vecs.num_iovecs = res->iov_cnt; + + ret = rutabaga_resource_attach_backing(vr->rutabaga,att_rb.resource_id,+ &vecs); + if (ret != 0) { + virtio_gpu_cleanup_mapping(g, res); + } + + CHECK(!ret, cmd); +} + +static void +rutabaga_cmd_detach_backing(VirtIOGPU *g, structvirtio_gpu_ctrl_command*cmd)+{ + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_detach_backing detach_rb; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(detach_rb); + trace_virtio_gpu_cmd_res_back_detach(detach_rb.resource_id); + + res = virtio_gpu_find_resource(g, detach_rb.resource_id); + CHECK(res, cmd); + + rutabaga_resource_detach_backing(vr->rutabaga, + detach_rb.resource_id); + + virtio_gpu_cleanup_mapping(g, res); +} + +static void +rutabaga_cmd_ctx_attach_resource(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_ctx_resource att_res; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(att_res); + trace_virtio_gpu_cmd_ctx_res_attach(att_res.hdr.ctx_id, + att_res.resource_id); + + result = rutabaga_context_attach_resource(vr->rutabaga,att_res.hdr.ctx_id,+ att_res.resource_id); + CHECK(!result, cmd); +} + +static void +rutabaga_cmd_ctx_detach_resource(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + struct virtio_gpu_ctx_resource det_res; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(det_res); + trace_virtio_gpu_cmd_ctx_res_detach(det_res.hdr.ctx_id, + det_res.resource_id); + + result = rutabaga_context_detach_resource(vr->rutabaga,det_res.hdr.ctx_id,+ det_res.resource_id); + CHECK(!result, cmd); +} + +static void +rutabaga_cmd_get_capset_info(VirtIOGPU *g, structvirtio_gpu_ctrl_command *cmd)+{ + int32_t result; + struct virtio_gpu_get_capset_info info; + struct virtio_gpu_resp_capset_info resp; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(info); + + result = rutabaga_get_capset_info(vr->rutabaga, info.capset_index, + &resp.capset_id,&resp.capset_max_version,+ &resp.capset_max_size); + CHECK(!result, cmd); + + resp.hdr.type = VIRTIO_GPU_RESP_OK_CAPSET_INFO; + virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp)); +} + +static void +rutabaga_cmd_get_capset(VirtIOGPU *g, struct virtio_gpu_ctrl_command*cmd)+{ + int32_t result; + struct virtio_gpu_get_capset gc; + struct virtio_gpu_resp_capset *resp; + uint32_t capset_size, capset_version; + uint32_t current_id, i; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(gc); + for (i = 0; i < vr->num_capsets; i++) { + result = rutabaga_get_capset_info(vr->rutabaga, i, + ¤t_id,&capset_version,+ &capset_size); + CHECK(!result, cmd); + + if (current_id == gc.capset_id) { + break; + } + } + + CHECK(i < vr->num_capsets, cmd); + + resp = g_malloc0(sizeof(*resp) + capset_size); + resp->hdr.type = VIRTIO_GPU_RESP_OK_CAPSET; + rutabaga_get_capset(vr->rutabaga, gc.capset_id, gc.capset_version, + resp->capset_data, capset_size); + + virtio_gpu_ctrl_response(g, cmd, &resp->hdr, sizeof(*resp) +capset_size);+ g_free(resp); +} + +static void +rutabaga_cmd_resource_create_blob(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int result; + struct rutabaga_iovecs vecs = { 0 }; + g_autofree struct virtio_gpu_simple_resource *res = NULL; + struct virtio_gpu_resource_create_blob cblob; + struct rutabaga_create_blob rc_blob = { 0 }; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(cblob); + trace_virtio_gpu_cmd_res_create_blob(cblob.resource_id,cblob.size);+ + CHECK(cblob.resource_id != 0, cmd); + + res = g_new0(struct virtio_gpu_simple_resource, 1); + + res->resource_id = cblob.resource_id; + res->blob_size = cblob.size; + + if (cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) { + result = virtio_gpu_create_mapping_iov(g, cblob.nr_entries, + sizeof(cblob), cmd,&res->addrs,+ &res->iov,&res->iov_cnt);+ CHECK(!result, cmd); + } + + rc_blob.blob_id = cblob.blob_id; + rc_blob.blob_mem = cblob.blob_mem; + rc_blob.blob_flags = cblob.blob_flags; + rc_blob.size = cblob.size; + + vecs.iovecs = res->iov; + vecs.num_iovecs = res->iov_cnt; + + result = rutabaga_resource_create_blob(vr->rutabaga,cblob.hdr.ctx_id,+ cblob.resource_id,&rc_blob,&vecs,+ NULL); + + if (result && cblob.blob_mem != VIRTIO_GPU_BLOB_MEM_HOST3D) { + virtio_gpu_cleanup_mapping(g, res); + } + + CHECK(!result, cmd); + + QTAILQ_INSERT_HEAD(&g->reslist, res, next); + res = NULL; +} + +static void +rutabaga_cmd_resource_map_blob(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + uint32_t map_info = 0; + uint32_t slot = 0; + struct virtio_gpu_simple_resource *res; + struct rutabaga_mapping mapping = { 0 }; + struct virtio_gpu_resource_map_blob mblob; + struct virtio_gpu_resp_map_info resp = { 0 }; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(mblob); + + CHECK(mblob.resource_id != 0, cmd); + + res = virtio_gpu_find_resource(g, mblob.resource_id); + CHECK(res, cmd); + + result = rutabaga_resource_map_info(vr->rutabaga,mblob.resource_id,+ &map_info); + CHECK(!result, cmd); + + /* + * RUTABAGA_MAP_ACCESS_* flags are not part of the virtio-gpuspec,but do+ * exist to potentially allow the hypervisor to restrict writeaccess to+ * memory. QEMU does not need to use this functionality at themoment.+ */ + resp.map_info = map_info & RUTABAGA_MAP_CACHE_MASK; + + result = rutabaga_resource_map(vr->rutabaga, mblob.resource_id,&mapping);+ CHECK(!result, cmd); + + for (slot = 0; slot < MAX_SLOTS; slot++) { + if (vr->memory_regions[slot].used) { + continue; + } + + MemoryRegion *mr = &(vr->memory_regions[slot].mr); + memory_region_init_ram_ptr(mr, NULL, "blob", mapping.size, + mapping.ptr); + memory_region_add_subregion(&g->parent_obj.hostmem, + mblob.offset, mr); + vr->memory_regions[slot].resource_id = mblob.resource_id; + vr->memory_regions[slot].used = 1; + break; + } + + if (slot >= MAX_SLOTS) { + result = rutabaga_resource_unmap(vr->rutabaga,mblob.resource_id);+ CHECK(!result, cmd); + } + + CHECK(slot < MAX_SLOTS, cmd); + + resp.hdr.type = VIRTIO_GPU_RESP_OK_MAP_INFO; + virtio_gpu_ctrl_response(g, cmd, &resp.hdr, sizeof(resp)); +} + +static void +rutabaga_cmd_resource_unmap_blob(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + int32_t result; + uint32_t slot = 0; + struct virtio_gpu_simple_resource *res; + struct virtio_gpu_resource_unmap_blob ublob; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(ublob); + + CHECK(ublob.resource_id != 0, cmd); + + res = virtio_gpu_find_resource(g, ublob.resource_id); + CHECK(res, cmd); + + for (slot = 0; slot < MAX_SLOTS; slot++) { + if (vr->memory_regions[slot].resource_id !=ublob.resource_id) {+ continue; + } + + MemoryRegion *mr = &(vr->memory_regions[slot].mr); + memory_region_del_subregion(&g->parent_obj.hostmem, mr); + + vr->memory_regions[slot].resource_id = 0; + vr->memory_regions[slot].used = 0; + break; + } + + CHECK(slot < MAX_SLOTS, cmd); + result = rutabaga_resource_unmap(vr->rutabaga, res->resource_id); + CHECK(!result, cmd); +} + +static void +virtio_gpu_rutabaga_process_cmd(VirtIOGPU *g, + struct virtio_gpu_ctrl_command *cmd) +{ + struct rutabaga_fence fence = { 0 }; + int32_t result; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + VIRTIO_GPU_FILL_CMD(cmd->cmd_hdr); + + switch (cmd->cmd_hdr.type) { + case VIRTIO_GPU_CMD_CTX_CREATE: + rutabaga_cmd_context_create(g, cmd); + break; + case VIRTIO_GPU_CMD_CTX_DESTROY: + rutabaga_cmd_context_destroy(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_CREATE_2D: + rutabaga_cmd_create_resource_2d(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_CREATE_3D: + rutabaga_cmd_create_resource_3d(g, cmd); + break; + case VIRTIO_GPU_CMD_SUBMIT_3D: + rutabaga_cmd_submit_3d(g, cmd); + break; + case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D: + rutabaga_cmd_transfer_to_host_2d(g, cmd); + break; + case VIRTIO_GPU_CMD_TRANSFER_TO_HOST_3D: + rutabaga_cmd_transfer_to_host_3d(g, cmd); + break; + case VIRTIO_GPU_CMD_TRANSFER_FROM_HOST_3D: + rutabaga_cmd_transfer_from_host_3d(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING: + rutabaga_cmd_attach_backing(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING: + rutabaga_cmd_detach_backing(g, cmd); + break; + case VIRTIO_GPU_CMD_SET_SCANOUT: + rutabaga_cmd_set_scanout(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_FLUSH: + rutabaga_cmd_resource_flush(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_UNREF: + rutabaga_cmd_resource_unref(g, cmd); + break; + case VIRTIO_GPU_CMD_CTX_ATTACH_RESOURCE: + rutabaga_cmd_ctx_attach_resource(g, cmd); + break; + case VIRTIO_GPU_CMD_CTX_DETACH_RESOURCE: + rutabaga_cmd_ctx_detach_resource(g, cmd); + break; + case VIRTIO_GPU_CMD_GET_CAPSET_INFO: + rutabaga_cmd_get_capset_info(g, cmd); + break; + case VIRTIO_GPU_CMD_GET_CAPSET: + rutabaga_cmd_get_capset(g, cmd); + break; + case VIRTIO_GPU_CMD_GET_DISPLAY_INFO: + virtio_gpu_get_display_info(g, cmd); + break; + case VIRTIO_GPU_CMD_GET_EDID: + virtio_gpu_get_edid(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_CREATE_BLOB: + rutabaga_cmd_resource_create_blob(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB: + rutabaga_cmd_resource_map_blob(g, cmd); + break; + case VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB: + rutabaga_cmd_resource_unmap_blob(g, cmd); + break; + default: + cmd->error = VIRTIO_GPU_RESP_ERR_UNSPEC; + break; + } + + if (cmd->finished) { + return; + } + if (cmd->error) { + error_report("%s: ctrl 0x%x, error 0x%x", __func__, + cmd->cmd_hdr.type, cmd->error); + virtio_gpu_ctrl_response_nodata(g, cmd, cmd->error); + return; + } + if (!(cmd->cmd_hdr.flags & VIRTIO_GPU_FLAG_FENCE)) { + virtio_gpu_ctrl_response_nodata(g, cmd,VIRTIO_GPU_RESP_OK_NODATA);+ return; + } + + fence.flags = cmd->cmd_hdr.flags; + fence.ctx_id = cmd->cmd_hdr.ctx_id; + fence.fence_id = cmd->cmd_hdr.fence_id; + fence.ring_idx = cmd->cmd_hdr.ring_idx; + + trace_virtio_gpu_fence_ctrl(cmd->cmd_hdr.fence_id,cmd->cmd_hdr.type);+ + result = rutabaga_create_fence(vr->rutabaga, &fence); + CHECK(!result, cmd); +} + +static void +virtio_gpu_rutabaga_aio_cb(void *opaque) +{ + struct rutabaga_aio_data *data = opaque; + VirtIOGPU *g = VIRTIO_GPU(data->vr); + struct rutabaga_fence fence_data = data->fence; + struct virtio_gpu_ctrl_command *cmd, *tmp; + + uint32_t signaled_ctx_specific = fence_data.flags & + RUTABAGA_FLAG_INFO_RING_IDX; + + QTAILQ_FOREACH_SAFE(cmd, &g->fenceq, next, tmp) { + /* + * Due to context specific timelines. + */ + uint32_t target_ctx_specific = cmd->cmd_hdr.flags & + RUTABAGA_FLAG_INFO_RING_IDX; + + if (signaled_ctx_specific != target_ctx_specific) { + continue; + } + + if (signaled_ctx_specific && + (cmd->cmd_hdr.ring_idx != fence_data.ring_idx)) { + continue; + } + + if (cmd->cmd_hdr.fence_id > fence_data.fence_id) { + continue; + } + + trace_virtio_gpu_fence_resp(cmd->cmd_hdr.fence_id); + virtio_gpu_ctrl_response_nodata(g, cmd,VIRTIO_GPU_RESP_OK_NODATA);+ QTAILQ_REMOVE(&g->fenceq, cmd, next); + g_free(cmd); + } + + g_free(data); +} + +static void +virtio_gpu_rutabaga_fence_cb(uint64_t user_data, + const struct rutabaga_fence *fence) { + struct rutabaga_aio_data *data; + VirtIOGPU *g = (VirtIOGPU *)user_data; + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + + /* + * gfxstream and both cross-domain (and even newer versionsvirglrenderer:+ * see VIRGL_RENDERER_ASYNC_FENCE_CB) like to signal fencecompletion on+ * threads ("callback threads") that are different from the threadthat+ * processes the command queue ("main thread"). + * + * crosvm and other virtio-gpu 1.1 implementations enable callbackthreads+ * via locking. However, on QEMU a deadlock is observed if + * virtio_gpu_ctrl_response_nodata(..) [used in the fencecallback]is used+ * from a thread that is not the main thread. + * + * The reason is QEMU's internal locking is designed to work withQEMU+ * threads (see rcu_register_thread()) and not generic C/C++/Rustthreads.+ * For now, we can workaround this by scheduling the return of the + * fence descriptors on the main thread. + */ + + data = g_new0(struct rutabaga_aio_data, 1); + data->vr = vr; + data->fence = *fence; + aio_bh_schedule_oneshot(qemu_get_aio_context(), + virtio_gpu_rutabaga_aio_cb, + data); +} + +static void +virtio_gpu_rutabaga_debug_cb(uint64_t user_data, + const struct rutabaga_debug *debug) { + + if (debug->debug_type == RUTABAGA_DEBUG_ERROR) { + error_report("%s", debug->message); + } else if (debug->debug_type == RUTABAGA_DEBUG_WARN) { + warn_report("%s", debug->message); + } else if (debug->debug_type == RUTABAGA_DEBUG_INFO) { + info_report("%s", debug->message); + } +} + +static bool virtio_gpu_rutabaga_init(VirtIOGPU *g, Error **errp) +{ + int result; + uint64_t capset_mask; + struct rutabaga_builder builder = { 0 }; + char wayland_socket_path[UNIX_PATH_MAX]; + struct rutabaga_channel channel = { 0 }; + struct rutabaga_channels channels = { 0 }; + + VirtIOGPURutabaga *vr = VIRTIO_GPU_RUTABAGA(g); + vr->rutabaga = NULL; + + if (!vr->capset_names) { + error_setg(errp, "a capset name from the virtio-gpu spec isrequired");+ return false; + } + + builder.wsi = RUTABAGA_WSI_SURFACELESS; + /* + * Currently, if WSI is specified, the only valid strings are"surfaceless"+ * or "headless". Surfaceless doesn't create a native windowsurface, but+ * does copy from the render target to the Pixman buffer if avirtio-gpu+ * 2D hypercall is issued. Surfacless is the default. + * + * Headless is like surfaceless, but doesn't copy to the Pixmanbuffer. The+ * use case is automated testing environments where there is noneedto view+ * results. + * + * In the future, more performant virtio-gpu 2D UI integration maybe added.+ */ + if (vr->wsi) { + if (g_str_equal(vr->wsi, "surfaceless")) { + vr->headless = false; + } else if (g_str_equal(vr->wsi, "headless")) { + vr->headless = true; + } else { + error_setg(errp, "invalid wsi option selected"); + return false; + } + } + + result = rutabaga_calculate_capset_mask(vr->capset_names,&capset_mask); First, sorry for responding after such a long time. I've been busy with work and I'm doing QEMU in my free time. In iteration 1 I've raised the topic on capset_names [1] and I haven't seen it answered properly. Perhaps I need to rephrase a bit so here wego:capset_names seems to be colon-separated list of bit options managed by rutabaga. This introduces yet another way of options handling. Therehavebeen talks about harmonizing options handling in QEMU since apparentlyitis considered too complex [2,3].Why not pass the "capset" as a bitfield like capset_mask and have QEMU create "capset" from QOM properties?IIUC these flags could come from virtio_gpu.h which is already present inthe QEMU tree. This would not inly shortcut the dependency on rutabagaherebut would also be more idiomatic QEMU (since it makes the options more introspectable by internal machinery).Of course the bitfield approach would require modifications in QEMU whenever rutabaga gains new features. However, I figure that in the long term rutabaga will be quite feature complete such that the benefits of idiomatic QEMU handling will outweigh the decoupling of the projects. What do you think?I think what you're suggesting is something like -device virtio-gpu-rutabaga,capset_mask=0x10100 [40, which would be gfxstream_vulkan + cross_domain]?I was thinking more along the lines of `virtio-gpu-rutabaga,gfxstream_vulkan=on,cross_domain=on` where gfxstream_vulkan and cross_domain are boolean QOM properties. This would make for a human-readable format which follows QEMU style.We actually did consider something like that when adding the --context-types flag [with crosvm], but there was a desire for a human-readable format rather than numbers [even if they are in the virtio-gpu spec]. Additionally, there are quite a few context types that people are playing around with [gfxstream-gles, gfxstream-composer] that are launchable and aren't in the spec just yet.Right, QEMU had to be modified for this kind of experimentation. I considered this in my last paragraph and figured that in the long run QEMU *may* prefer more idiomatic option handling since it tries hard to not break its command line interface. I'm just pointing this out -- the decision is ultimately up to the community. Why not have dedicated QEMU development branches for experimentation? Wouldn't upstreaming new features into QEMU be a good motivation to get the missing pieces into the spec, once they are mature?Also, a key feature we want to explicitly **not** turn on all available context-types and let the user decide.How would you prevent that with the current colon-separated approach? Splitting capset_mask in multiple parameters is just a different syntactical representation of the same thing.That'll allow guest Mesa in particular to do its magic in its loader. So one may run Zink + ANV with ioctl forwarding, or Iris + ioctl forwarding and compare performance with the same guest image. And another thing is one needs some knowledge of the host system to choose the right context type. You wouldn't do Zink + ANV ioctl forwarding on MacOS. So I think the task of choosing the right context type will falltoprojects that depend on QEMU (such as Android Emulator) which have some knowledge of the host environment. We actually have a graphics detector somewhere that calls VK/OpenGL before launching the VM and sets the right options. Plan is to port into gfxstream, maybe we could use that.You could bail out in QEMU if rutabaga_calculate_capset_mask() detects conflicting combinations, no?So given the desire for human readable formats, being portable across VMMs (crosvm, qemu, rust-vmm??) and experimentation, the string -> capset mask conversion was put in the rutabaga API. So I wouldn't change it for those reasons.What do you mean by being portable across VMMs?Having the API inside rutabaga is (mildly) useful when multiple VMMs have the need to translate from a human-readable format to flags digestible by rutabaga. https://android.googlesource.com/device/google/cuttlefish/+/refs/heads/main/host/libs/vm_manager/qemu_manager.cpp#452 https://android.googlesource.com/device/google/cuttlefish/+/refs/heads/main/host/libs/vm_manager/crosvm_manager.cpp#353 https://chromium.googlesource.com/chromiumos/platform2/+/refs/heads/main/vm_tools/concierge/vm_builder.cc#505 For these crosvm/qemu launchers, I imagine capset names will be plumbed all the way through eventually (launch_cvd --gpu_context=gfxstream-vulkan:cross-domain if you've played around with Cuttlefish, or vmc start --gpu_contexts=gfxstream-vulkan if you played around with Termina VMs). I think rust-vmm could also use the same API ("--capset_names") too.Sure, QEMU had to be taught new flags before being able to use new rutabaga features. I agree that this comes with a certain inconvenience. But it may also be inconvenient for QEMU to deal with additional ad-hoc options parsing when there are efforts for harmonization. Did my comments shed new light into the discussion?Yes, they do. I agree with you that both crosvm/qemu have too many flags, and having a stable command line interface is important. We are aiming for stability with the `--capset_names={colon string}` command line, and at least for crosvm looking to deprecate older options [since we've never had an official release of crosvm yet]. I do think: 1) "capset_names=gfxstream-vulkan:cross-domain" 2) "cross-domain=on,gfxstream-vulkan=on" are similar enough. I would choose (1) for since I think not duplicating the [name] -> flag logic and having a similar interface across VMMs + VMM launchers is ever-so slightly useful.I think we've now reached a good understanding of the issue. It's now up to the QEMU community to make a choice. So I'm cc'ing Markus and Thomas as the experts of the topic.
Sorry for the late reply ... but I'm also not really an expert here. But I think the colon string (1) looks like a less common way for handling settings in QEMU. The option (2) looks preferable to me.
Thomas
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