[{"id":3682653,"web_url":"http://patchwork.ozlabs.org/comment/3682653/","msgid":"","list_archive_url":null,"date":"2026-04-27T11:28:18","subject":"Re: [PATCH v2] virtio-gpu: fix inverted mouse cursor","submitter":{"id":6442,"url":"http://patchwork.ozlabs.org/api/people/6442/","name":"Marc-André Lureau","email":"marcandre.lureau@gmail.com"},"content":"Hi\n\nOn Mon, Apr 27, 2026 at 2:57 PM Benno Fünstück\n wrote:\n>\n> From: Benno Fünfstück \n>\n> This is a fix for a bug in virglrenderer, where if the guest uses hardware mouse cursor acceleration then the mouse cursor can end up being a resource with the flag Y_0_TOP set.\n> But virglrenderer does not honor this flag when reading the cursor data.\n> This has been fixed in current virglrenderer master.\n> For older virglrenderer, we need to make sure to flip the cursor data such that display clients render it correctly.\n>\n> For example, this fixes mouse cursor rendering for wlroots-based window managers (like Sway) in Linux guests.\n>\n> Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/2315\n> Signed-off-by: Benno Fünfstück \n\nIn v1, Akihiko raised a valid concern that this might be backported\nand fixed in earlier version of virgl:\nhttps://patchew.org/QEMU/20260409144639.3610-1-benno.fuenfstueck@neodyme.io/#40fb4df5-20a7-49ce-a087-d9c048255d05@rsg.ci.i.u-tokyo.ac.jp\n\n\n> ---\n> Now with a version check, since the fix for this is in virlglrenderer master so I think it is any version newer than the current one (which is 1.3.0).\n> I copied the code from virtio-gpu-virgl.c for the version check for simplicty, if I should instead move that code for some DRY feel free to say so.\n>\n> hw/display/virtio-gpu-gl.c | 45 ++++++++++++++++++++++++++++++++++++++\n> 1 file changed, 45 insertions(+)\n>\n> diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c\n> index 2b7a41c466..6505a84f5e 100644\n> --- a/hw/display/virtio-gpu-gl.c\n> +++ b/hw/display/virtio-gpu-gl.c\n> @@ -26,6 +26,25 @@\n>\n> #include \n>\n> +/*\n> + * VIRGL_CHECK_VERSION available since libvirglrenderer 1.0.1 and was fixed\n> + * in 1.1.0. Undefine bugged version of the macro and provide our own.\n> + */\n> +#if defined(VIRGL_CHECK_VERSION) && \\\n> + VIRGL_VERSION_MAJOR == 1 && VIRGL_VERSION_MINOR < 1\n> +#undef VIRGL_CHECK_VERSION\n> +#endif\n> +\n> +#ifndef VIRGL_CHECK_VERSION\n> +#define VIRGL_CHECK_VERSION(major, minor, micro) \\\n> + (VIRGL_VERSION_MAJOR > (major) || \\\n> + VIRGL_VERSION_MAJOR == (major) && VIRGL_VERSION_MINOR > (minor) || \\\n> + VIRGL_VERSION_MAJOR == (major) && VIRGL_VERSION_MINOR == (minor) && \\\n> + VIRGL_VERSION_MICRO >= (micro))\n> +#endif\n> +\n> +#define VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX (!VIRGL_CHECK_VERSION(1, 3, 1))\n> +\n> static void virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> struct virtio_gpu_scanout *s,\n> uint32_t resource_id)\n> @@ -33,6 +52,11 @@ static void virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> VirtIOGPUGL *gl = VIRTIO_GPU_GL(g);\n> uint32_t width, height;\n> uint32_t pixels, *data;\n> +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> + bool y_0_top = true;\n> + int ret;\n> + struct virgl_renderer_resource_info info;\n> +#endif\n>\n> if (gl->renderer_state != RS_INITED) {\n> return;\n> @@ -49,8 +73,29 @@ static void virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> return;\n> }\n>\n> +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> + memset(&info, 0, sizeof(info));\n> + ret = virgl_renderer_resource_get_info(resource_id, &info);\n> + if (ret == 0) {\n> + y_0_top = info.flags & VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP;\n> + }\n> +#endif\n> +\n> pixels = s->current_cursor->width * s->current_cursor->height;\n> +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> + if (y_0_top) {\n> + memcpy(s->current_cursor->data, data, pixels * sizeof(uint32_t));\n> + } else {\n> + uint32_t *dst = s->current_cursor->data;\n> + for (uint32_t y = 0; y < height; y++) {\n> + memcpy(dst + y * width,\n> + data + (height - 1 - y) * width,\n> + width * sizeof(uint32_t));\n> + }\n> + }\n> +#else\n> memcpy(s->current_cursor->data, data, pixels * sizeof(uint32_t));\n> +#endif\n> free(data);\n> }\n>\n> --\n> 2.51.2\n>\n>\n> --\n> Neodyme AG\n> Sitz der Gesellschaft / Address: Dirnismaning 55 | Halle 13 |\n> 85748 Garching b.München\n> Postanschrift: Rosenthaler Straße 72a | 10119\n> Berlin\n>\n> Registergericht / Registry court: München, HRB 269168\n> Vorstand /\n> Management Board: Thomas Lambertz | Tobias Madl\n> Aufsichtsratsvorsitzender /\n> Chairman of the Supervisory Board: Hendrik Hofstadt\n>\n>\n>\n>\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=aT5VfVs/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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Mon, 27 Apr 2026\n 04:28:31 -0700 (PDT)","MIME-Version":"1.0","References":"<20260427105531.75701-1-benno.fuenfstueck@neodyme.io>","In-Reply-To":"<20260427105531.75701-1-benno.fuenfstueck@neodyme.io>","From":"=?utf-8?q?Marc-Andr=C3=A9_Lureau?= ","Date":"Mon, 27 Apr 2026 15:28:18 +0400","X-Gm-Features":"AVHnY4LImAiqjTuHya80gWYMhUEQ9x1UlSp5Z52MIXnnQZAyzZjn4Vh8zXPGtMU","Message-ID":"\n ","Subject":"Re: [PATCH v2] virtio-gpu: fix inverted mouse cursor","To":"=?utf-8?q?Benno_F=C3=BCnst=C3=BCck?= ","Cc":"qemu-devel@nongnu.org, \"Michael S. Tsirkin\" ,\n\t=?utf-8?q?Alex_Benn=C3=A9e?= ,\n Akihiko Odaki ,\n Dmitry Osipenko ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","Received-SPF":"pass client-ip=2607:f8b0:4864:20::132d;\n envelope-from=marcandre.lureau@gmail.com; helo=mail-dy1-x132d.google.com","X-Spam_score_int":"-19","X-Spam_score":"-2.0","X-Spam_bar":"--","X-Spam_report":"(-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n MXG_EMAIL_FRAG=0.099, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"}},{"id":3682674,"web_url":"http://patchwork.ozlabs.org/comment/3682674/","msgid":"","list_archive_url":null,"date":"2026-04-27T12:15:02","subject":"Re: [PATCH v2] virtio-gpu: fix inverted mouse cursor","submitter":{"id":93105,"url":"http://patchwork.ozlabs.org/api/people/93105/","name":"Benno Fünfstück","email":"benno.fuenfstueck@neodyme.io"},"content":"On Mon, 27 Apr 2026 at 13:28, Marc-André Lureau \nwrote:\n\n>\n> In v1, Akihiko raised a valid concern that this might be backported\n> and fixed in earlier version of virgl:\n>\n> https://patchew.org/QEMU/20260409144639.3610-1-benno.fuenfstueck@neodyme.io/#40fb4df5-20a7-49ce-a087-d9c048255d05@rsg.ci.i.u-tokyo.ac.jp\n>\n>\nThat's a valid point, then feel free to just ignore the patch.\n\n\n> > ---\n> > Now with a version check, since the fix for this is in virlglrenderer\n> master so I think it is any version newer than the current one (which is\n> 1.3.0).\n> > I copied the code from virtio-gpu-virgl.c for the version check for\n> simplicty, if I should instead move that code for some DRY feel free to say\n> so.\n> >\n> > hw/display/virtio-gpu-gl.c | 45 ++++++++++++++++++++++++++++++++++++++\n> > 1 file changed, 45 insertions(+)\n> >\n> > diff --git a/hw/display/virtio-gpu-gl.c b/hw/display/virtio-gpu-gl.c\n> > index 2b7a41c466..6505a84f5e 100644\n> > --- a/hw/display/virtio-gpu-gl.c\n> > +++ b/hw/display/virtio-gpu-gl.c\n> > @@ -26,6 +26,25 @@\n> >\n> > #include \n> >\n> > +/*\n> > + * VIRGL_CHECK_VERSION available since libvirglrenderer 1.0.1 and was\n> fixed\n> > + * in 1.1.0. Undefine bugged version of the macro and provide our own.\n> > + */\n> > +#if defined(VIRGL_CHECK_VERSION) && \\\n> > + VIRGL_VERSION_MAJOR == 1 && VIRGL_VERSION_MINOR < 1\n> > +#undef VIRGL_CHECK_VERSION\n> > +#endif\n> > +\n> > +#ifndef VIRGL_CHECK_VERSION\n> > +#define VIRGL_CHECK_VERSION(major, minor, micro) \\\n> > + (VIRGL_VERSION_MAJOR > (major) || \\\n> > + VIRGL_VERSION_MAJOR == (major) && VIRGL_VERSION_MINOR > (minor) ||\n> \\\n> > + VIRGL_VERSION_MAJOR == (major) && VIRGL_VERSION_MINOR == (minor)\n> && \\\n> > + VIRGL_VERSION_MICRO >= (micro))\n> > +#endif\n> > +\n> > +#define VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX (!VIRGL_CHECK_VERSION(1, 3, 1))\n> > +\n> > static void virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> > struct virtio_gpu_scanout\n> *s,\n> > uint32_t resource_id)\n> > @@ -33,6 +52,11 @@ static void\n> virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> > VirtIOGPUGL *gl = VIRTIO_GPU_GL(g);\n> > uint32_t width, height;\n> > uint32_t pixels, *data;\n> > +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> > + bool y_0_top = true;\n> > + int ret;\n> > + struct virgl_renderer_resource_info info;\n> > +#endif\n> >\n> > if (gl->renderer_state != RS_INITED) {\n> > return;\n> > @@ -49,8 +73,29 @@ static void\n> virtio_gpu_gl_update_cursor_data(VirtIOGPU *g,\n> > return;\n> > }\n> >\n> > +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> > + memset(&info, 0, sizeof(info));\n> > + ret = virgl_renderer_resource_get_info(resource_id, &info);\n> > + if (ret == 0) {\n> > + y_0_top = info.flags & VIRTIO_GPU_RESOURCE_FLAG_Y_0_TOP;\n> > + }\n> > +#endif\n> > +\n> > pixels = s->current_cursor->width * s->current_cursor->height;\n> > +#if VIRGL_NEEDS_CURSOR_DATA_FLIP_FIX\n> > + if (y_0_top) {\n> > + memcpy(s->current_cursor->data, data, pixels *\n> sizeof(uint32_t));\n> > + } else {\n> > + uint32_t *dst = s->current_cursor->data;\n> > + for (uint32_t y = 0; y < height; y++) {\n> > + memcpy(dst + y * width,\n> > + data + (height - 1 - y) * width,\n> > + width * sizeof(uint32_t));\n> > + }\n> > + }\n> > +#else\n> > memcpy(s->current_cursor->data, data, pixels * sizeof(uint32_t));\n> > +#endif\n> > free(data);\n> > }\n> >\n> > --\n> > 2.51.2\n> >\n> >\n> > --\n> > Neodyme AG\n> > Sitz der Gesellschaft / Address: Dirnismaning 55 | Halle 13 |\n> > 85748 Garching b.München\n> > Postanschrift: Rosenthaler Straße 72a | 10119\n> > Berlin\n> >\n> > Registergericht / Registry court: München, HRB 269168\n> > Vorstand /\n> > Management Board: Thomas Lambertz | Tobias Madl\n> > Aufsichtsratsvorsitzender /\n> > Chairman of the Supervisory Board: Hendrik Hofstadt\n> >\n> >\n> >\n> >\n> >\n>\n>\n> --\n> Marc-André Lureau\n>","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=neodyme.io header.i=@neodyme.io header.a=rsa-sha256\n header.s=google header.b=bK3fJgbk;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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