From a4c043b54f7d02e9572065d3a2d01139949ab7eb Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Wed, 17 Nov 2010 12:06:44 +0100 Subject: [PATCH] vgabios update: handle compatibility with older qemu versions As pointed out by avi the vgabios update is guest-visible and thus has migration implications. One change is that the vga has a valid pci rom bar now. We already have a pci bus property to enable/disable the rom bar and we'll load the bios via fw_cfg as fallback for the no-rom-bar case. So we just have to add compat properties to handle this case. A second change is that the magic bochs lfb @ 0xe0000000 is gone. When live-migrating a guest from a older qemu version it might be using the lfb though, so we have to keep it for the old machine types. The patch enables the bochs lfb in case we don't have the pci rom bar enabled (i.e. we are in 0.13+older compat mode). This patch depends on these patches which add (and use) the pc-0.13 machine type: http://patchwork.ozlabs.org/patch/70797/ http://patchwork.ozlabs.org/patch/70798/ Signed-off-by: Gerd Hoffmann Cc: avi@redhat.com Signed-off-by: Anthony Liguori --- hw/pc_piix.c | 16 ++++++++++++++++ hw/vga-pci.c | 5 +++++ hw/vmware_vga.c | 5 +++++ 3 files changed, 26 insertions(+) diff --git a/hw/pc_piix.c b/hw/pc_piix.c index 31c80d2..7d29d43 100644 --- a/hw/pc_piix.c +++ b/hw/pc_piix.c @@ -230,6 +230,14 @@ static QEMUMachine pc_machine_v0_13 = { .driver = "virtio-9p-pci", .property = "vectors", .value = stringify(0), + },{ + .driver = "VGA", + .property = "rombar", + .value = stringify(0), + },{ + .driver = "vmware-svga", + .property = "rombar", + .value = stringify(0), }, { /* end of list */ } }, @@ -249,6 +257,14 @@ static QEMUMachine pc_machine_v0_12 = { .driver = "virtio-serial-pci", .property = "vectors", .value = stringify(0), + },{ + .driver = "VGA", + .property = "rombar", + .value = stringify(0), + },{ + .driver = "vmware-svga", + .property = "rombar", + .value = stringify(0), }, { /* end of list */ } } diff --git a/hw/vga-pci.c b/hw/vga-pci.c index b09789c..791ca22 100644 --- a/hw/vga-pci.c +++ b/hw/vga-pci.c @@ -92,6 +92,11 @@ static int pci_vga_initfn(PCIDevice *dev) pci_register_bar(&d->dev, 0, VGA_RAM_SIZE, PCI_BASE_ADDRESS_MEM_PREFETCH, vga_map); + if (!dev->rom_bar) { + /* compatibility with pc-0.13 and older */ + vga_init_vbe(s); + } + return 0; } diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c index 9337fdb..d0f4e1b 100644 --- a/hw/vmware_vga.c +++ b/hw/vmware_vga.c @@ -1301,6 +1301,11 @@ static int pci_vmsvga_initfn(PCIDevice *dev) vmsvga_init(&s->chip, VGA_RAM_SIZE); + if (!dev->rom_bar) { + /* compatibility with pc-0.13 and older */ + vga_init_vbe(&s->chip.vga); + } + return 0; } -- 2.7.4