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Wed, 5 Jun 2024 13:14:47 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.192.217]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8FC2C1956055; Wed, 5 Jun 2024 13:14:46 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 437C71800DD3; Wed, 5 Jun 2024 15:14:44 +0200 (CEST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 9878d3eb-233d-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717593292; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vkSiq4a30KX/BtKlzALhqQstMUl79qOxtGFoh3xybvE=; b=P6TkaPomyj8h0djr4ki93gTaFdYTrLsGK/8usJWTxEZeQ0DRTsq330lDEns8QZyF8XPM/K mbIgmOGJQyuaKTMAzkR8OQL7OhgSBHqWbG2Hv3q3hwfSz68ZvgwuqztDnbN+jhASwdyoAb 0DjO3XdmVaG+7X9Ze9UgH7+3sT4wduI= X-MC-Unique: rbWF64UtPluLoJfyEMRmOA-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: Stefano Stabellini , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paul Durrant , xen-devel@lists.xenproject.org, Gerd Hoffmann , Anthony PERARD , qemu-stable@nongnu.org Subject: [PATCH v3 1/3] stdvga: fix screen blanking Date: Wed, 5 Jun 2024 15:14:41 +0200 Message-ID: <20240605131444.797896-2-kraxel@redhat.com> In-Reply-To: <20240605131444.797896-1-kraxel@redhat.com> References: <20240605131444.797896-1-kraxel@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1717593337139100001 Content-Type: text/plain; charset="utf-8" In case the display surface uses a shared buffer (i.e. uses vga vram directly instead of a shadow) go unshare the buffer before clearing it. This avoids vga memory corruption, which in turn fixes unblanking not working properly with X11. Cc: qemu-stable@nongnu.org Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2067 Signed-off-by: Gerd Hoffmann --- hw/display/vga.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/hw/display/vga.c b/hw/display/vga.c index 30facc6c8e33..474b6b14c327 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -1762,6 +1762,12 @@ static void vga_draw_blank(VGACommonState *s, int fu= ll_update) if (s->last_scr_width <=3D 0 || s->last_scr_height <=3D 0) return; =20 + if (is_buffer_shared(surface)) { + /* unshare buffer, otherwise the blanking corrupts vga vram */ + surface =3D qemu_create_displaysurface(s->last_scr_width, s->last_= scr_height); + dpy_gfx_replace_surface(s->con, surface); + } + w =3D s->last_scr_width * surface_bytes_per_pixel(surface); d =3D surface_data(surface); for(i =3D 0; i < s->last_scr_height; i++) { --=20 2.45.1