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From 319f3876fafc35412bbf0ef6797c6764c95af6f3 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Tue, 21 Mar 2017 09:58:03 +0100
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Subject: [PATCH 3/7] cirrus: add option to disable blitter
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1490090287-1503-4-git-send-email-kraxel@redhat.com>
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Patchwork-id: 74424
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O-Subject: [RHEL-7.4 qemu-kvm PATCH 3/7] cirrus: add option to disable blitter
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Bugzilla: 1430059
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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Ok, we have this beast in the cirrus code which is not used at all by
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modern guests, except when you try to find security holes in qemu. So,
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add an option to disable blitter altogether. Guests released within
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the last ten years should not show any rendering issues if you turn off
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blitter support.
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There are no known bugs in the cirrus blitter code. But in the past we
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hoped a few times already that we've finally nailed the last issue. So
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having some easy way to mitigate in case yet another blitter issue shows
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up certainly makes me sleep a bit better at night.
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For completeness: The by far better way to mitigate is to switch away
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from cirrus and use stdvga instead. Or something more modern like
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virtio-vga in case your guest has support for it.
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: 1489494540-15745-1-git-send-email-kraxel@redhat.com
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(cherry picked from commit 827bd5172641f2a360ff9a3bad57bcf82e7f03f0)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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hw/display/cirrus_vga.c
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---
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hw/display/cirrus_vga.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
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index 83cef70..86b4c8b 100644
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--- a/hw/display/cirrus_vga.c
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+++ b/hw/display/cirrus_vga.c
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@@ -203,6 +203,7 @@ typedef struct CirrusVGAState {
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uint8_t cirrus_hidden_palette[48];
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uint32_t hw_cursor_x;
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uint32_t hw_cursor_y;
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+ bool enable_blitter;
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int cirrus_blt_pixelwidth;
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int cirrus_blt_width;
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int cirrus_blt_height;
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@@ -954,6 +955,10 @@ static void cirrus_bitblt_start(CirrusVGAState * s)
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{
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uint8_t blt_rop;
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+ if (!s->enable_blitter) {
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+ goto bitblt_ignore;
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+ }
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+
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s->vga.gr[0x31] |= CIRRUS_BLT_BUSY;
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s->cirrus_blt_width = (s->vga.gr[0x20] | (s->vga.gr[0x21] << 8)) + 1;
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@@ -2995,6 +3000,8 @@ static int vga_initfn(ISADevice *dev)
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static Property isa_cirrus_vga_properties[] = {
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DEFINE_PROP_UINT32("vgamem_mb", struct ISACirrusVGAState,
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cirrus_vga.vga.vram_size_mb, 16),
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+ DEFINE_PROP_BOOL("blitter", struct ISACirrusVGAState,
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+ cirrus_vga.enable_blitter, true),
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DEFINE_PROP_END_OF_LIST(),
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};
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@@ -3060,6 +3067,8 @@ static int pci_cirrus_vga_initfn(PCIDevice *dev)
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static Property pci_vga_cirrus_properties[] = {
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DEFINE_PROP_UINT32("vgamem_mb", struct PCICirrusVGAState,
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cirrus_vga.vga.vram_size_mb, 16),
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+ DEFINE_PROP_BOOL("blitter", struct PCICirrusVGAState,
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+ cirrus_vga.enable_blitter, true),
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DEFINE_PROP_END_OF_LIST(),
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};
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--
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1.8.3.1
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