From 2857f5445ef55ece7011d49937e6c3fd7444a1dc Mon Sep 17 00:00:00 2001 From: Ladi Prosek Date: Mon, 31 Oct 2016 19:33:05 +0100 Subject: vgabios: Reorder video modes to work around a Windows bug RH-Author: Ladi Prosek Message-id: <1477924385-6169-1-git-send-email-lprosek@redhat.com> Patchwork-id: 72677 O-Subject: [RHEL-7.4/7.3.z seabios PATCH] vgabios: Reorder video modes to work around a Windows bug Bugzilla: 1392028 RH-Acked-by: Laszlo Ersek RH-Acked-by: Gerd Hoffmann RH-Acked-by: vrozenfe Windows Server 2016 and Windows 10 RS1 come with a bug in its blue screen of death rendering logic which prevents it from generating crash dumps. The bug does not manifest if Windows sees a suitable 32 bpp video mode before a suitable 24 bpp video mode in the list of modes returned from vgabios. This commit moves all 32 bpp modes to the front of the list to make sure that this is always the case. Upstream patch: https://www.coreboot.org/pipermail/seabios/2016-October/010963.html There are valid concerns upstream about the breaking nature of the fix but for the limited set of operating systems supported by RHEL/RHEV we can easily verify that they are unaffected. So as things stand now, this is a downstream-only patch which will be reverted in the near future; the exact time will depend on Windows 10 RS2 schedule and other factors. The goal is to make sure that our customers running Windows 10 VMs can generate crash dumps. Signed-off-by: Ladi Prosek Signed-off-by: Miroslav Rezanina --- vgasrc/bochsvga.c | 39 ++++++++++++++++++++------------------- 1 file changed, 20 insertions(+), 19 deletions(-) diff --git a/vgasrc/bochsvga.c b/vgasrc/bochsvga.c index ec5d101..c5d1511 100644 --- a/vgasrc/bochsvga.c +++ b/vgasrc/bochsvga.c @@ -28,6 +28,25 @@ static struct bochsvga_mode u16 mode; struct vgamode_s info; } bochsvga_modes[] VAR16 = { + /* 32 bpp BOCHS modes */ + { 0x140, { MM_DIRECT, 320, 200, 32, 8, 16, SEG_GRAPH } }, + { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } }, + { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } }, + { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } }, + { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } }, + { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } }, + { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } }, + { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } }, + { 0x177, { MM_DIRECT, 1280, 768, 32, 8, 16, SEG_GRAPH } }, + { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } }, + { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } }, + { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } }, + { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } }, + { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } }, + { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } }, + { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } }, + { 0x18f, { MM_DIRECT, 1280, 720, 32, 8, 16, SEG_GRAPH } }, + { 0x192, { MM_DIRECT, 1920, 1080, 32, 8, 16, SEG_GRAPH } }, /* standard modes */ { 0x100, { MM_PACKED, 640, 400, 8, 8, 16, SEG_GRAPH } }, { 0x101, { MM_PACKED, 640, 480, 8, 8, 16, SEG_GRAPH } }, @@ -56,50 +75,32 @@ static struct bochsvga_mode { 0x11D, { MM_DIRECT, 1600, 1200, 15, 8, 16, SEG_GRAPH } }, { 0x11E, { MM_DIRECT, 1600, 1200, 16, 8, 16, SEG_GRAPH } }, { 0x11F, { MM_DIRECT, 1600, 1200, 24, 8, 16, SEG_GRAPH } }, - /* BOCHS modes */ - { 0x140, { MM_DIRECT, 320, 200, 32, 8, 16, SEG_GRAPH } }, - { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } }, - { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } }, - { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } }, - { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } }, - { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } }, + /* 8, 15, 16, and 24 bpp BOCHS modes */ { 0x146, { MM_PACKED, 320, 200, 8, 8, 16, SEG_GRAPH } }, - { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } }, { 0x148, { MM_PACKED, 1152, 864, 8, 8, 16, SEG_GRAPH } }, { 0x149, { MM_DIRECT, 1152, 864, 15, 8, 16, SEG_GRAPH } }, { 0x14a, { MM_DIRECT, 1152, 864, 16, 8, 16, SEG_GRAPH } }, { 0x14b, { MM_DIRECT, 1152, 864, 24, 8, 16, SEG_GRAPH } }, - { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } }, { 0x175, { MM_DIRECT, 1280, 768, 16, 8, 16, SEG_GRAPH } }, { 0x176, { MM_DIRECT, 1280, 768, 24, 8, 16, SEG_GRAPH } }, - { 0x177, { MM_DIRECT, 1280, 768, 32, 8, 16, SEG_GRAPH } }, { 0x178, { MM_DIRECT, 1280, 800, 16, 8, 16, SEG_GRAPH } }, { 0x179, { MM_DIRECT, 1280, 800, 24, 8, 16, SEG_GRAPH } }, - { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } }, { 0x17b, { MM_DIRECT, 1280, 960, 16, 8, 16, SEG_GRAPH } }, { 0x17c, { MM_DIRECT, 1280, 960, 24, 8, 16, SEG_GRAPH } }, - { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } }, { 0x17e, { MM_DIRECT, 1440, 900, 16, 8, 16, SEG_GRAPH } }, { 0x17f, { MM_DIRECT, 1440, 900, 24, 8, 16, SEG_GRAPH } }, - { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } }, { 0x181, { MM_DIRECT, 1400, 1050, 16, 8, 16, SEG_GRAPH } }, { 0x182, { MM_DIRECT, 1400, 1050, 24, 8, 16, SEG_GRAPH } }, - { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } }, { 0x184, { MM_DIRECT, 1680, 1050, 16, 8, 16, SEG_GRAPH } }, { 0x185, { MM_DIRECT, 1680, 1050, 24, 8, 16, SEG_GRAPH } }, - { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } }, { 0x187, { MM_DIRECT, 1920, 1200, 16, 8, 16, SEG_GRAPH } }, { 0x188, { MM_DIRECT, 1920, 1200, 24, 8, 16, SEG_GRAPH } }, - { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } }, { 0x18a, { MM_DIRECT, 2560, 1600, 16, 8, 16, SEG_GRAPH } }, { 0x18b, { MM_DIRECT, 2560, 1600, 24, 8, 16, SEG_GRAPH } }, - { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } }, { 0x18d, { MM_DIRECT, 1280, 720, 16, 8, 16, SEG_GRAPH } }, { 0x18e, { MM_DIRECT, 1280, 720, 24, 8, 16, SEG_GRAPH } }, - { 0x18f, { MM_DIRECT, 1280, 720, 32, 8, 16, SEG_GRAPH } }, { 0x190, { MM_DIRECT, 1920, 1080, 16, 8, 16, SEG_GRAPH } }, { 0x191, { MM_DIRECT, 1920, 1080, 24, 8, 16, SEG_GRAPH } }, - { 0x192, { MM_DIRECT, 1920, 1080, 32, 8, 16, SEG_GRAPH } }, }; static int dispi_found VAR16 = 0; -- 1.8.3.1