From patchwork Thu Jul 4 12:48:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 13723715 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 2686AC30653 for ; Thu, 4 Jul 2024 12:53:11 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sPLtV-0004Ij-Qq; Thu, 04 Jul 2024 08:49:01 -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 1sPLtD-00048f-Li; Thu, 04 Jul 2024 08:48:47 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sPLt9-0006I7-9L; Thu, 04 Jul 2024 08:48:43 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 0A63F7739D; Thu, 4 Jul 2024 15:48:22 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 969D8FE782; Thu, 4 Jul 2024 15:48:26 +0300 (MSK) Received: (nullmailer pid 1471773 invoked by uid 1000); Thu, 04 Jul 2024 12:48:26 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Gerd Hoffmann , =?utf-8?q?Mar?= =?utf-8?q?c-Andr=C3=A9_Lureau?= , =?utf-8?q?Ph?= =?utf-8?q?ilippe_Mathieu-Daud=C3=A9?= , Michael Tokarev Subject: [Stable-7.2.13 03/17] stdvga: fix screen blanking Date: Thu, 4 Jul 2024 15:48:10 +0300 Message-Id: <20240704124826.1471715-3-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, 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: 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 From: Gerd Hoffmann 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 Reviewed-by: Marc-André Lureau Message-ID: <20240605131444.797896-2-kraxel@redhat.com> Signed-off-by: Philippe Mathieu-Daudé (cherry picked from commit b1cf266c82cb1211ee2785f1813a6a3f3e693390) Signed-off-by: Michael Tokarev diff --git a/hw/display/vga.c b/hw/display/vga.c index 0cb26a791b..8e2d44bea3 100644 --- a/hw/display/vga.c +++ b/hw/display/vga.c @@ -1746,6 +1746,13 @@ 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++) {