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hw/i386: Add the ramfb romfile compatibility

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ramfb is a sysbus device so it can only used for machine types where it
is explicitly enabled:

  # git grep machine_class_allow_dynamic_sysbus_dev.*TYPE_RAMFB_DEVICE
  hw/arm/virt.c:    machine_class_allow_dynamic_sysbus_dev(mc,
		  TYPE_RAMFB_DEVICE);
  hw/i386/microvm.c:    machine_class_allow_dynamic_sysbus_dev(mc,
		  TYPE_RAMFB_DEVICE);
  hw/i386/pc_piix.c:    machine_class_allow_dynamic_sysbus_dev(m,
		  TYPE_RAMFB_DEVICE);
  hw/i386/pc_q35.c:    machine_class_allow_dynamic_sysbus_dev(m,
		  TYPE_RAMFB_DEVICE);
  hw/loongarch/virt.c:    machine_class_allow_dynamic_sysbus_dev(mc,
		  TYPE_RAMFB_DEVICE);
  hw/riscv/virt.c:    machine_class_allow_dynamic_sysbus_dev(mc,
		  TYPE_RAMFB_DEVICE);

So these six are the only machine types we have to worry about.

The three x86 machine types (pc, q35, microvm) will actually use the rom
(when booting with seabios).

For arm/riscv/loongarch virt we want to disable the rom.

This patch sets ramfb romfile option to false by default, except for x86
machines types (pc, q35, microvm) which need the rom file when booting
with seabios and machine types <= 10.0 (handling the case of arm virt,
for compat reasons).

At the same time, set the "use-legacy-x86-rom" property to true on those
historical versioned machine types in order to avoid the memory layout
being changed.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Shaoqin Huang <shahuang@redhat.com>
Message-ID: <20250717100941.2230408-4-shahuang@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Shaoqin Huang 2025-07-17 06:09:41 -04:00 committed by Gerd Hoffmann
parent b53a3bba5e
commit d5fcf0d960
6 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hw/core/machine.c
View File

@ -39,6 +39,8 @@
GlobalProperty hw_compat_10_0[] = {
{ "scsi-hd", "dpofua", "off" },
{ "ramfb", "use-legacy-x86-rom", "true"},
{ "vfio-pci", "use-legacy-x86-rom", "true" },
};
const size_t hw_compat_10_0_len = G_N_ELEMENTS(hw_compat_10_0);

2
hw/display/ramfb-standalone.c
View File

@ -64,7 +64,7 @@ static const VMStateDescription ramfb_dev_vmstate = {
static const Property ramfb_properties[] = {
DEFINE_PROP_BOOL("x-migrate", RAMFBStandaloneState, migrate, true),
DEFINE_PROP_BOOL("use-legacy-x86-rom", RAMFBStandaloneState,
use_legacy_x86_rom, true),
use_legacy_x86_rom, false),
};
static void ramfb_class_initfn(ObjectClass *klass, const void *data)

3
hw/i386/microvm.c
View File

@ -49,6 +49,7 @@
#include "hw/acpi/generic_event_device.h"
#include "hw/pci-host/gpex.h"
#include "hw/usb/xhci.h"
#include "hw/vfio/types.h"
#include "elf.h"
#include "kvm/kvm_i386.h"
@ -633,6 +634,8 @@ GlobalProperty microvm_properties[] = {
* so reserving io space is not going to work. Turn it off.
*/
{ "pcie-root-port", "io-reserve", "0" },
{ TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
{ TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
};
static void microvm_class_init(ObjectClass *oc, const void *data)

10
hw/i386/pc_piix.c
View File

@ -49,6 +49,7 @@
#include "hw/i2c/smbus_eeprom.h"
#include "system/memory.h"
#include "hw/acpi/acpi.h"
#include "hw/vfio/types.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "system/xen.h"
@ -77,6 +78,13 @@ static const int ide_iobase2[MAX_IDE_BUS] = { 0x3f6, 0x376 };
static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
#endif
static GlobalProperty pc_piix_compat_defaults[] = {
{ TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
{ TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
};
static const size_t pc_piix_compat_defaults_len =
G_N_ELEMENTS(pc_piix_compat_defaults);
/*
* Return the global irq number corresponding to a given device irq
* pin. We could also use the bus number to have a more precise mapping.
@ -492,6 +500,8 @@ static void pc_i440fx_machine_options(MachineClass *m)
pc_set_south_bridge);
object_class_property_set_description(oc, "x-south-bridge",
"Use a different south bridge than PIIX3");
compat_props_add(m->compat_props,
pc_piix_compat_defaults, pc_piix_compat_defaults_len);
}
static void pc_i440fx_machine_10_1_options(MachineClass *m)

3
hw/i386/pc_q35.c
View File

@ -45,6 +45,7 @@
#include "hw/i386/pc.h"
#include "hw/i386/amd_iommu.h"
#include "hw/i386/intel_iommu.h"
#include "hw/vfio/types.h"
#include "hw/virtio/virtio-iommu.h"
#include "hw/display/ramfb.h"
#include "hw/ide/pci.h"
@ -67,6 +68,8 @@
static GlobalProperty pc_q35_compat_defaults[] = {
{ TYPE_VIRTIO_IOMMU_PCI, "aw-bits", "39" },
{ TYPE_RAMFB_DEVICE, "use-legacy-x86-rom", "true" },
{ TYPE_VFIO_PCI, "use-legacy-x86-rom", "true" },
};
static const size_t pc_q35_compat_defaults_len =
G_N_ELEMENTS(pc_q35_compat_defaults);

2
hw/vfio/pci.c
View File

@ -3810,7 +3810,7 @@ static const TypeInfo vfio_pci_dev_info = {
static const Property vfio_pci_dev_nohotplug_properties[] = {
DEFINE_PROP_BOOL("ramfb", VFIOPCIDevice, enable_ramfb, false),
DEFINE_PROP_BOOL("use-legacy-x86-rom", VFIOPCIDevice,
use_legacy_x86_rom, true),
use_legacy_x86_rom, false),
DEFINE_PROP_ON_OFF_AUTO("x-ramfb-migrate", VFIOPCIDevice, ramfb_migrate,
ON_OFF_AUTO_AUTO),
};