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From 3e580f65ac69c7a84b672a59de6772dae24b5a8a Mon Sep 17 00:00:00 2001
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From: Cole Robinson <crobinso@redhat.com>
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Date: Tue, 19 Feb 2013 15:35:40 -0500
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Subject: [PATCH] pc_piix: Add compat handling for qemu-kvm VGA mem size
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Paolo outlines this here:
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https://lists.gnu.org/archive/html/qemu-devel/2013-01/msg02540.html
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qemu-kvm defaulted to vgamem=16MB since at least 0.15, while qemu used
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8MB. For qemu 1.2, the default was changed to 16MB for all devices
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except cirrus.
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If --enable-migration-from-qemu-kvm is specified, make sure cirrus
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uses 16MB for <= pc-1.2 (the qemu-kvm merge), and 16MB always for
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all others. This will break incoming qemu migration for qemu < 1.3.
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---
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hw/i386/pc_piix.c | 20 ++++++++++++++++----
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1 file changed, 16 insertions(+), 4 deletions(-)
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diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
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index 43ab480..48fb7b7 100644
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--- a/hw/i386/pc_piix.c
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+++ b/hw/i386/pc_piix.c
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@@ -383,6 +383,13 @@ static QEMUMachine pc_machine_v1_3 = {
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DEFAULT_MACHINE_OPTIONS,
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};
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+#ifdef CONFIG_MIGRATE_FROM_QEMU_KVM
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+/* qemu-kvm defaulted to 16MB video memory since 0.15 at least. */
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+# define OLD_VGA_MEM stringify(16)
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+#else
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+# define OLD_VGA_MEM stringify(8)
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+#endif
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+
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#define PC_COMPAT_1_2 \
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PC_COMPAT_1_3,\
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{\
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@@ -406,6 +413,10 @@ static QEMUMachine pc_machine_v1_3 = {
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.property = "revision",\
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.value = stringify(3),\
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},{\
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+ .driver = "cirrus-vga",\
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+ .property = "vgamem_mb",\
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+ .value = OLD_VGA_MEM,\
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+ },{\
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.driver = "VGA",\
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.property = "mmio",\
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.value = "off",\
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@@ -423,6 +434,7 @@ static QEMUMachine pc_machine_v1_2 = {
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DEFAULT_MACHINE_OPTIONS,
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};
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+
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#define PC_COMPAT_1_1 \
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PC_COMPAT_1_2,\
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{\
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@@ -436,19 +448,19 @@ static QEMUMachine pc_machine_v1_2 = {
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},{\
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.driver = "VGA",\
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.property = "vgamem_mb",\
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- .value = stringify(8),\
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+ .value = OLD_VGA_MEM,\
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},{\
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.driver = "vmware-svga",\
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.property = "vgamem_mb",\
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- .value = stringify(8),\
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+ .value = OLD_VGA_MEM,\
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},{\
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.driver = "qxl-vga",\
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.property = "vgamem_mb",\
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- .value = stringify(8),\
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+ .value = OLD_VGA_MEM,\
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},{\
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.driver = "qxl",\
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.property = "vgamem_mb",\
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- .value = stringify(8),\
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+ .value = OLD_VGA_MEM,\
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},{\
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.driver = "virtio-blk-pci",\
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.property = "config-wce",\
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