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: 13683914 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.gnu.org (lists.gnu.org [209.51.188.17]) (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 19051C25B75 for ; Mon, 3 Jun 2024 15:19:20 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sE9SH-0006iY-Tl; Mon, 03 Jun 2024 11:18:37 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sE9SG-0006hz-6n for qemu-devel@nongnu.org; Mon, 03 Jun 2024 11:18:36 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sE9SE-0005qz-EU for qemu-devel@nongnu.org; Mon, 03 Jun 2024 11:18:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717427911; 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=hlQm+ZufPAUlPSnq9HOYeYL1yl5XrVdUg5QHNPLfvGUK6MV0jrxJ8Jvwr2uHJcZ6PMEeac JGDgkFUmchW1yJfSUvbLebcmTB1i6q3kQBaWICKUBpf1rbjULyvsXnSvbcaxUCG0WqqeA3 /Mp3DzK9p5963Lv8FVnlbQabAcsauBM= 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 X-MC-Unique: Iy7WdosbNt6_HMy2-StTTQ-1 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) 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 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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++) {