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From d4b8b97fab7f66875dfc212a7e18f16436d79340 Mon Sep 17 00:00:00 2001
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From: Ladi Prosek <lprosek@redhat.com>
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Date: Mon, 31 Oct 2016 19:33:05 +0100
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Subject: [PATCH] vgabios: Reorder video modes to work around a Windows bug
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RH-Author: Ladi Prosek <lprosek@redhat.com>
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Message-id: <1477924385-6169-1-git-send-email-lprosek@redhat.com>
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Patchwork-id: 72677
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O-Subject: [RHEL-7.4/7.3.z seabios PATCH] vgabios: Reorder video modes to work around a Windows bug
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Bugzilla: 1392028
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: vrozenfe <vrozenfe@redhat.com>
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Windows Server 2016 and Windows 10 RS1 come with a bug in its blue screen
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of death rendering logic which prevents it from generating crash dumps.
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The bug does not manifest if Windows sees a suitable 32 bpp video mode
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before a suitable 24 bpp video mode in the list of modes returned from
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vgabios. This commit moves all 32 bpp modes to the front of the list to
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make sure that this is always the case.
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Upstream patch:
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https://www.coreboot.org/pipermail/seabios/2016-October/010963.html
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There are valid concerns upstream about the breaking nature of the fix
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but for the limited set of operating systems supported by RHEL/RHEV we
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can easily verify that they are unaffected. So as things stand now, this
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is a downstream-only patch which will be reverted in the near future;
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the exact time will depend on Windows 10 RS2 schedule and other factors.
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The goal is to make sure that our customers running Windows 10 VMs can
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generate crash dumps.
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Signed-off-by: Ladi Prosek <lprosek@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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vgasrc/bochsvga.c | 39 ++++++++++++++++++++-------------------
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1 file changed, 20 insertions(+), 19 deletions(-)
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diff --git a/vgasrc/bochsvga.c b/vgasrc/bochsvga.c
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index aa82fc5..a43a21f 100644
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--- a/vgasrc/bochsvga.c
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+++ b/vgasrc/bochsvga.c
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@@ -27,6 +27,25 @@ static struct bochsvga_mode
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u16 mode;
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struct vgamode_s info;
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} bochsvga_modes[] VAR16 = {
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+ /* 32 bpp BOCHS modes */
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+ { 0x140, { MM_DIRECT, 320, 200, 32, 8, 16, SEG_GRAPH } },
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+ { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } },
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+ { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } },
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+ { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } },
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+ { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } },
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+ { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } },
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+ { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } },
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+ { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } },
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+ { 0x177, { MM_DIRECT, 1280, 768, 32, 8, 16, SEG_GRAPH } },
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+ { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } },
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+ { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } },
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+ { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } },
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+ { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } },
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+ { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } },
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+ { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } },
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+ { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } },
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+ { 0x18f, { MM_DIRECT, 1280, 720, 32, 8, 16, SEG_GRAPH } },
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+ { 0x192, { MM_DIRECT, 1920, 1080, 32, 8, 16, SEG_GRAPH } },
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/* standard modes */
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{ 0x100, { MM_PACKED, 640, 400, 8, 8, 16, SEG_GRAPH } },
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{ 0x101, { MM_PACKED, 640, 480, 8, 8, 16, SEG_GRAPH } },
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@@ -55,50 +74,32 @@ static struct bochsvga_mode
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{ 0x11D, { MM_DIRECT, 1600, 1200, 15, 8, 16, SEG_GRAPH } },
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{ 0x11E, { MM_DIRECT, 1600, 1200, 16, 8, 16, SEG_GRAPH } },
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{ 0x11F, { MM_DIRECT, 1600, 1200, 24, 8, 16, SEG_GRAPH } },
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- /* BOCHS modes */
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- { 0x140, { MM_DIRECT, 320, 200, 32, 8, 16, SEG_GRAPH } },
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- { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } },
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- { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } },
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- { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } },
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- { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } },
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- { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } },
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+ /* 8, 15, 16, and 24 bpp BOCHS modes */
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{ 0x146, { MM_PACKED, 320, 200, 8, 8, 16, SEG_GRAPH } },
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- { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } },
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{ 0x148, { MM_PACKED, 1152, 864, 8, 8, 16, SEG_GRAPH } },
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{ 0x149, { MM_DIRECT, 1152, 864, 15, 8, 16, SEG_GRAPH } },
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{ 0x14a, { MM_DIRECT, 1152, 864, 16, 8, 16, SEG_GRAPH } },
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{ 0x14b, { MM_DIRECT, 1152, 864, 24, 8, 16, SEG_GRAPH } },
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- { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } },
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{ 0x175, { MM_DIRECT, 1280, 768, 16, 8, 16, SEG_GRAPH } },
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{ 0x176, { MM_DIRECT, 1280, 768, 24, 8, 16, SEG_GRAPH } },
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- { 0x177, { MM_DIRECT, 1280, 768, 32, 8, 16, SEG_GRAPH } },
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{ 0x178, { MM_DIRECT, 1280, 800, 16, 8, 16, SEG_GRAPH } },
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{ 0x179, { MM_DIRECT, 1280, 800, 24, 8, 16, SEG_GRAPH } },
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- { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } },
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{ 0x17b, { MM_DIRECT, 1280, 960, 16, 8, 16, SEG_GRAPH } },
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{ 0x17c, { MM_DIRECT, 1280, 960, 24, 8, 16, SEG_GRAPH } },
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- { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } },
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{ 0x17e, { MM_DIRECT, 1440, 900, 16, 8, 16, SEG_GRAPH } },
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{ 0x17f, { MM_DIRECT, 1440, 900, 24, 8, 16, SEG_GRAPH } },
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- { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } },
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{ 0x181, { MM_DIRECT, 1400, 1050, 16, 8, 16, SEG_GRAPH } },
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{ 0x182, { MM_DIRECT, 1400, 1050, 24, 8, 16, SEG_GRAPH } },
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- { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } },
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{ 0x184, { MM_DIRECT, 1680, 1050, 16, 8, 16, SEG_GRAPH } },
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{ 0x185, { MM_DIRECT, 1680, 1050, 24, 8, 16, SEG_GRAPH } },
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- { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } },
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{ 0x187, { MM_DIRECT, 1920, 1200, 16, 8, 16, SEG_GRAPH } },
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{ 0x188, { MM_DIRECT, 1920, 1200, 24, 8, 16, SEG_GRAPH } },
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- { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } },
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{ 0x18a, { MM_DIRECT, 2560, 1600, 16, 8, 16, SEG_GRAPH } },
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{ 0x18b, { MM_DIRECT, 2560, 1600, 24, 8, 16, SEG_GRAPH } },
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- { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } },
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{ 0x18d, { MM_DIRECT, 1280, 720, 16, 8, 16, SEG_GRAPH } },
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{ 0x18e, { MM_DIRECT, 1280, 720, 24, 8, 16, SEG_GRAPH } },
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- { 0x18f, { MM_DIRECT, 1280, 720, 32, 8, 16, SEG_GRAPH } },
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{ 0x190, { MM_DIRECT, 1920, 1080, 16, 8, 16, SEG_GRAPH } },
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{ 0x191, { MM_DIRECT, 1920, 1080, 24, 8, 16, SEG_GRAPH } },
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- { 0x192, { MM_DIRECT, 1920, 1080, 32, 8, 16, SEG_GRAPH } },
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};
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static int dispi_found VAR16 = 0;
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--
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1.8.3.1
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