From cf8919bea07deeaa6cc07fd3f8ff000b13a7fac1 Mon Sep 17 00:00:00 2001
From: Cole Robinson <crobinso@redhat.com>
Date: Mon, 1 Apr 2013 20:02:59 -0400
Subject: [PATCH] qxl: Add rom_size compat property, fix migration from 1.2

Commit 038c1879a00153b14bce113315b693e8c2944fa9 changed the qxl rom
size to 8192, which fixes incoming migration from qemu 1.0. However
from qemu 1.2 and 1.3 had rom size 16384, so incoming migration
from those versions is now broken.

Add a rom_size compat property. 1.2+ get 16384, everything else is
8192.

This isn't actually fool proof, since rom_size can be dependent on
the version of spice qemu is built against:

https://lists.gnu.org/archive/html/qemu-devel/2013-02/msg03154.html

However these sizes match what native Fedora packages get, so it's
good enough for now.
---
 hw/pc_piix.c | 8 ++++++++
 hw/qxl.c     | 9 ++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index a771d79..c0af9b8 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -398,6 +398,14 @@ static QEMUMachine pc_machine_v1_2 = {
             .driver   = "virtio-blk-pci",\
             .property = "config-wce",\
             .value    = "off",\
+        },{ \
+            .driver   = "qxl", \
+            .property = "rom_size", \
+            .value    = stringify(8192), \
+        },{\
+            .driver   = "qxl-vga", \
+            .property = "rom_size", \
+            .value    = stringify(8192), \
         }
 
 static QEMUMachine pc_machine_v1_1 = {
diff --git a/hw/qxl.c b/hw/qxl.c
index 6a3467f..93fddb1 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -318,16 +318,14 @@ static inline uint32_t msb_mask(uint32_t val)
     return mask;
 }
 
-static ram_addr_t qxl_rom_size(void)
+static void check_qxl_rom_size(PCIQXLDevice *d)
 {
     uint32_t required_rom_size = sizeof(QXLRom) + sizeof(QXLModes) +
                                  sizeof(qxl_modes);
-    uint32_t rom_size = 8192; /* two pages */
 
     required_rom_size = MAX(required_rom_size, TARGET_PAGE_SIZE);
     required_rom_size = msb_mask(required_rom_size * 2 - 1);
-    assert(required_rom_size <= rom_size);
-    return rom_size;
+    assert(required_rom_size <= d->rom_size);
 }
 
 static void init_qxl_rom(PCIQXLDevice *d)
@@ -1987,7 +1985,7 @@ static int qxl_init_common(PCIQXLDevice *qxl)
     pci_set_byte(&config[PCI_REVISION_ID], pci_device_rev);
     pci_set_byte(&config[PCI_INTERRUPT_PIN], 1);
 
-    qxl->rom_size = qxl_rom_size();
+    check_qxl_rom_size(qxl);
     memory_region_init_ram(&qxl->rom_bar, "qxl.vrom", qxl->rom_size);
     vmstate_register_ram(&qxl->rom_bar, &qxl->pci.qdev);
     init_qxl_rom(qxl);
@@ -2303,6 +2301,7 @@ static Property qxl_properties[] = {
         DEFINE_PROP_UINT32("vram64_size_mb", PCIQXLDevice, vram_size_mb, -1),
         DEFINE_PROP_UINT32("vgamem_mb", PCIQXLDevice, vgamem_size_mb, 16),
         DEFINE_PROP_INT32("surfaces", PCIQXLDevice, ssd.num_surfaces, 1024),
+        DEFINE_PROP_UINT32("rom_size", PCIQXLDevice, rom_size, 16384),
         DEFINE_PROP_END_OF_LIST(),
 };