diff options
| -rw-r--r-- | hw/acpi/vmgenid.c | 14 | ||||
| -rw-r--r-- | include/hw/acpi/vmgenid.h | 1 | ||||
| -rw-r--r-- | include/hw/compat.h | 4 |
3 files changed, 19 insertions, 0 deletions
diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c index 7a3ad17d66..c3ddcc8e7c 100644 --- a/hw/acpi/vmgenid.c +++ b/hw/acpi/vmgenid.c @@ -205,9 +205,22 @@ static void vmgenid_handle_reset(void *opaque) memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le)); } +static Property vmgenid_properties[] = { + DEFINE_PROP_BOOL("x-write-pointer-available", VmGenIdState, + write_pointer_available, true), + DEFINE_PROP_END_OF_LIST(), +}; + static void vmgenid_realize(DeviceState *dev, Error **errp) { VmGenIdState *vms = VMGENID(dev); + + if (!vms->write_pointer_available) { + error_setg(errp, "%s requires DMA write support in fw_cfg, " + "which this machine type does not provide", VMGENID_DEVICE); + return; + } + qemu_register_reset(vmgenid_handle_reset, vms); } @@ -218,6 +231,7 @@ static void vmgenid_device_class_init(ObjectClass *klass, void *data) dc->vmsd = &vmstate_vmgenid; dc->realize = vmgenid_realize; dc->hotpluggable = false; + dc->props = vmgenid_properties; object_class_property_add_str(klass, VMGENID_GUID, NULL, vmgenid_set_guid, NULL); diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h index db7fa0e633..8578476bae 100644 --- a/include/hw/acpi/vmgenid.h +++ b/include/hw/acpi/vmgenid.h @@ -21,6 +21,7 @@ typedef struct VmGenIdState { DeviceClass parent_obj; QemuUUID guid; /* The 128-bit GUID seen by the guest */ uint8_t vmgenid_addr_le[8]; /* Address of the GUID (little-endian) */ + bool write_pointer_available; } VmGenIdState; static inline Object *find_vmgenid_dev(void) diff --git a/include/hw/compat.h b/include/hw/compat.h index fc8c3e0600..5d5be91daf 100644 --- a/include/hw/compat.h +++ b/include/hw/compat.h @@ -131,6 +131,10 @@ .driver = "fw_cfg_io",\ .property = "dma_enabled",\ .value = "off",\ + },{\ + .driver = "vmgenid",\ + .property = "x-write-pointer-available",\ + .value = "off",\ }, #define HW_COMPAT_2_3 \ |