From patchwork Mon Jun 3 15:18:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 13683910 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8E57C25B75 for ; Mon, 3 Jun 2024 15:18:51 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.734954.1141096 (Exim 4.92) (envelope-from ) id 1sE9SG-0003E5-Q2; Mon, 03 Jun 2024 15:18:36 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 734954.1141096; Mon, 03 Jun 2024 15:18:36 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sE9SG-0003Dy-MV; Mon, 03 Jun 2024 15:18:36 +0000 Received: by outflank-mailman (input) for mailman id 734954; Mon, 03 Jun 2024 15:18:34 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1sE9SE-0002zU-U7 for xen-devel@lists.xenproject.org; Mon, 03 Jun 2024 15:18:34 +0000 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 89ebe9ba-21bc-11ef-b4bb-af5377834399; Mon, 03 Jun 2024 17:18:33 +0200 (CEST) Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-126-Iy7WdosbNt6_HMy2-StTTQ-1; Mon, 03 Jun 2024 11:18:28 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B2E04185AD2C; Mon, 3 Jun 2024 15:18:27 +0000 (UTC) Received: from sirius.home.kraxel.org (unknown [10.39.192.239]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DC73F1050176; Mon, 3 Jun 2024 15:18:26 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 0C05718009AD; Mon, 3 Jun 2024 17:18:26 +0200 (CEST) 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: 89ebe9ba-21bc-11ef-b4bb-af5377834399 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717427912; 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=ZaHkqAfY0prOxd9IsvYxn3cjrCzTyehr8LM8V/cUr8u9y8nC/gDT5zr1ezo0VbF63ReQG+ CBYhNOd6hphyBpYhd13PoMbmI+ht2ARPhFcgQ3GGJWR00thyODBbGPvDYo+LDKiipCYas2 ADA1VUyxfjUmHRSDEFClWjtIl46k7HI= X-MC-Unique: Iy7WdosbNt6_HMy2-StTTQ-1 From: Gerd Hoffmann To: qemu-devel@nongnu.org Cc: Anthony PERARD , Gerd Hoffmann , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paul Durrant , xen-devel@lists.xenproject.org, Stefano Stabellini , qemu-stable@nongnu.org Subject: [PATCH v2 1/3] stdvga: fix screen blanking Date: Mon, 3 Jun 2024 17:18:23 +0200 Message-ID: <20240603151825.188353-2-kraxel@redhat.com> In-Reply-To: <20240603151825.188353-1-kraxel@redhat.com> References: <20240603151825.188353-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.3 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 full_update) if (s->last_scr_width <= 0 || s->last_scr_height <= 0) return; + if (is_buffer_shared(surface)) { + /* unshare buffer, otherwise the blanking corrupts vga vram */ + surface = qemu_create_displaysurface(s->last_scr_width, s->last_scr_height); + dpy_gfx_replace_surface(s->con, surface); + } + w = s->last_scr_width * surface_bytes_per_pixel(surface); d = surface_data(surface); for(i = 0; i < s->last_scr_height; i++) {